CN118590816A - Device and method for driving magnetic bag to move based on surface acoustic wave - Google Patents
Device and method for driving magnetic bag to move based on surface acoustic wave Download PDFInfo
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- CN118590816A CN118590816A CN202411060616.8A CN202411060616A CN118590816A CN 118590816 A CN118590816 A CN 118590816A CN 202411060616 A CN202411060616 A CN 202411060616A CN 118590816 A CN118590816 A CN 118590816A
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- 238000010897 surface acoustic wave method Methods 0.000 title claims abstract description 54
- 230000005291 magnetic effect Effects 0.000 title claims abstract description 40
- 238000000034 method Methods 0.000 title claims description 17
- 239000000696 magnetic material Substances 0.000 claims abstract description 52
- 239000000463 material Substances 0.000 claims abstract description 44
- 229910001385 heavy metal Inorganic materials 0.000 claims abstract description 11
- 238000010586 diagram Methods 0.000 claims abstract description 7
- 239000000758 substrate Substances 0.000 claims abstract description 7
- 238000013329 compounding Methods 0.000 claims abstract description 4
- 244000037364 Cinnamomum aromaticum Species 0.000 claims description 26
- 235000014489 Cinnamomum aromaticum Nutrition 0.000 claims description 26
- 230000033001 locomotion Effects 0.000 claims description 10
- 230000004044 response Effects 0.000 claims description 7
- 230000009471 action Effects 0.000 claims description 5
- 238000013016 damping Methods 0.000 claims description 5
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims description 4
- 239000002033 PVDF binder Substances 0.000 claims description 3
- HFGPZNIAWCZYJU-UHFFFAOYSA-N lead zirconate titanate Chemical compound [O-2].[O-2].[O-2].[O-2].[O-2].[Ti+4].[Zr+4].[Pb+2] HFGPZNIAWCZYJU-UHFFFAOYSA-N 0.000 claims description 3
- 229910052451 lead zirconate titanate Inorganic materials 0.000 claims description 3
- 229920002981 polyvinylidene fluoride Polymers 0.000 claims description 3
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims description 2
- GUBSQCSIIDQXLB-UHFFFAOYSA-N cobalt platinum Chemical compound [Co].[Pt].[Pt].[Pt] GUBSQCSIIDQXLB-UHFFFAOYSA-N 0.000 claims description 2
- -1 cobalt-iron-boron-platinum Chemical compound 0.000 claims description 2
- 230000005294 ferromagnetic effect Effects 0.000 claims description 2
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 claims description 2
- 229910052737 gold Inorganic materials 0.000 claims description 2
- 239000010931 gold Substances 0.000 claims description 2
- 229910052697 platinum Inorganic materials 0.000 claims description 2
- 229910052709 silver Inorganic materials 0.000 claims description 2
- 239000004332 silver Substances 0.000 claims description 2
- 239000010410 layer Substances 0.000 description 51
- 230000008859 change Effects 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 238000006073 displacement reaction Methods 0.000 description 3
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- 230000026058 directional locomotion Effects 0.000 description 2
- 230000005284 excitation Effects 0.000 description 2
- 230000005398 magnetoelastic coupling Effects 0.000 description 2
- 239000011241 protective layer Substances 0.000 description 2
- 125000006850 spacer group Chemical group 0.000 description 2
- 208000021386 Sjogren Syndrome Diseases 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
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- 230000005415 magnetization Effects 0.000 description 1
- 238000001755 magnetron sputter deposition Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
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- 210000000582 semen Anatomy 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
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- Surface Acoustic Wave Elements And Circuit Networks Thereof (AREA)
Abstract
The invention discloses a device for driving a magnetic Siegesbeck bag to move based on surface acoustic waves, which comprises: the piezoelectric material layer is arranged above the substrate layer, and the heavy metal-magnetic material layer, the first interdigital electrode and the second interdigital electrode are arranged above the piezoelectric material layer; the first interdigital electrode and the second interdigital electrode are respectively positioned at two ends of the heavy metal-magnetic material layer; the heavy metal-magnetic material layer is formed by compounding heavy metal and magnetic material, and different types of space-time diagram bags are carried in the region, close to the first interdigital electrode, of the magnetic material; the first interdigital electrode is connected with a pulse voltage source, and under alternating pulse voltage applied by the pulse voltage source, surface acoustic waves are generated on the upper surface of the piezoelectric material layer and are conducted into the magnetic material through heavy metals so as to drive the Sjog seed bag.
Description
Technical Field
The invention belongs to the technical field of spin electronic devices, and particularly relates to a device and a method for driving a magnetic Siegesbeck seed bag to move based on surface acoustic waves.
Background
Individual magnetic spinners are stable granular spin magnetization configurations in chiral magnets, their stability being due to the topological nature of the spinners. However, in current racetrack memory models, a single sigma pattern can represent only one binary bit, where a change in distance between the sigma patterns may result in a loss of data. Thus, there is interest in higher topology number of spinners that can encode more data per spin texture while retaining the advantages of a single spinner. For example, it was proposed in 2019 to assemble a composite structure of a plurality of elementary particle shaped cassia seeds. It consists of a single outer spacer (i.e., circular domain wall) surrounding a plurality of smaller inner nested spacer fingers, which can achieve any integer topology.
Any topological charge gives the potential for a space bag to achieve high density and multiple data information encoding. Thus attracting extensive theoretical research including their existence and stability, the creation of control, and dynamics driven by spin orbit torque, spin transfer torque, gradient of anisotropy, and voltage gates. Nevertheless, achieving manipulation of low-dissipation, low-frequency, stoneley bags remains a problem.
Disclosure of Invention
Aiming at the problems that the manipulation of the magnetic bag is difficult to realize with low dissipation and high response, and the like, the invention provides a device and a method for driving the magnetic bag to move based on surface acoustic waves.
In a first aspect, an embodiment of the present invention provides a device for driving a magnetic segetum bag to move based on a surface acoustic wave, including: the piezoelectric material layer is arranged above the substrate layer, and the heavy metal-magnetic material layer, the first interdigital electrode and the second interdigital electrode are arranged above the piezoelectric material layer; the first interdigital electrode and the second interdigital electrode are respectively positioned at two ends of the heavy metal-magnetic material layer;
The heavy metal-magnetic material layer is formed by compounding heavy metal and magnetic material, and different types of space-time diagram bags are carried in the region, close to the first interdigital electrode, of the magnetic material;
the first interdigital electrode is connected with a pulse voltage source, and under alternating pulse voltage applied by the pulse voltage source, surface acoustic waves are generated on the upper surface of the piezoelectric material layer and are conducted into the magnetic material through heavy metals so as to drive the Sjog seed bag.
In a second aspect, an embodiment of the present invention provides a method for driving a magnetic bag to move based on a surface acoustic wave, which is implemented based on the device for driving a magnetic bag to move based on a surface acoustic wave, where the method includes:
Under the alternating pulse voltage applied to the first interdigital electrode, the piezoelectric material layer is deformed, so that the upper surface of the piezoelectric material layer generates surface acoustic waves; the maximum sound wave amplitude of the surface sound wave is controlled by the amplitude of the alternating pulse voltage and the piezoelectric constant of the piezoelectric material layer;
the surface acoustic wave propagates from left to right, and is conducted to the magnetic material through heavy metal, so that magnetocrystalline anisotropy in the magnetic material is changed, and a dynamic strain gradient is generated;
Under the action of dynamic strain gradient, enabling the space, close to the first interdigital electrode, of the magnetic material to move from a stable initial state to the space, close to the second interdigital electrode, of the magnetic material under the limitation of the boundary of the magnetic material, so as to drive the space;
the second interdigital electrode receives a response generated by the transmitted surface acoustic wave.
In a third aspect, an embodiment of the present invention provides a storage chip, including a chip main body and the device for driving a magnetic segetum bag to move based on a surface acoustic wave, where the device is disposed on the storage chip main body.
In a fourth aspect, an embodiment of the present invention provides a storage circuit, including a circuit board main body and a storage chip, where the storage chip is disposed on the circuit board main body.
In a fifth aspect, embodiments of the present invention provide a storage device comprising a housing and a storage circuit.
Compared with the prior art, the invention has the beneficial effects that at least the following steps are included:
(1) The invention drives the magnetic bag by the surface acoustic wave to realize the directional movement of the magnetic bag. The device has the advantages of low power consumption, high frequency response and the like by using a mechanical means of the magneto-elastic coupling effect.
(2) The device provided by the invention has the advantages of higher topological number of the Sjog seeds, which means that higher storage data can be accommodated, and the functions of encoding multiple data information and the like are realized. Has wide application prospect in the track memory.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of an apparatus for driving a magnetic Siemens pouch to move based on a surface acoustic wave according to an embodiment of the present invention;
Fig. 2 is a schematic diagram of an apparatus for driving a magnetic bag according to an embodiment of the present invention to move based on a surface acoustic wave, where (a) in fig. 2 is a front view, and (B) in fig. 2 is a top view;
FIG. 3 is a schematic diagram of a device for driving a moving operation of a bag of semen Sojae by sound waves generated by interdigital electrodes; wherein, the two ends of the piezoelectric material layer along the x direction are provided with high elastic damping to eliminate the reflection influence of surface acoustic waves; the figure shows a magnetic moment (mz) profile along the z direction of a strip film carrying a n=6 magnetic segetum pouch;
Fig. 4 is a schematic view of a position change transient of a device for driving a bag according to an embodiment of the present invention, where the bag in fig. 4 (a) is a movement case of the bag with n=5, fig. 4 (B) shows the case of movement of the bag of the singe type with n=6, and fig. 4 (C) shows the change of displacement in the y direction after excitation of the surface acoustic wave;
Fig. 5 is a time-varying chart of the position change of the device for driving the stevensite bag based on sound waves, wherein the marked data point moments are in one-to-one correspondence with the moments in fig. 4.
Specific symbols in the drawings are:
1. A heavy metal-magnetic material layer; 201. a first interdigital electrode; 202. a second interdigital electrode; 3. a piezoelectric material layer; 4. a substrate layer; 5. and (3) a protective layer.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the detailed description is presented by way of example only and is not intended to limit the scope of the invention.
Aiming at the problems that the manipulation of the magnetic bag is difficult to realize with low dissipation and high response, the invention provides a device and a method for driving the magnetic bag to move by using surface acoustic waves. Through the magneto-elastic coupling effect, a mechanical means of changing the dynamic magnetocrystalline anisotropy by adopting the surface acoustic wave responded by the piezoelectric effect is adopted to drive the magnetic Sjog seed bag to realize directional movement along the magnetic nano strip. The structure of the invention is easy to prepare, the method is simple, and the invention has potential application prospect in the fields of memory devices, logic devices, multi-data information coding and the like.
As shown in fig. 1 and 2, an embodiment of the present invention provides a device for driving a magnetic stoneley bag to move based on a surface acoustic wave, including: a substrate layer 4, a piezoelectric material layer 3 is arranged above the substrate layer 4, and a heavy metal-magnetic material layer 1, a first interdigital electrode 201 and a second interdigital electrode 202 are arranged above the piezoelectric material layer 3; wherein, the first interdigital electrode 201 and the second interdigital electrode 202 are respectively positioned at two ends of the heavy metal-magnetic material layer 1;
the heavy metal-magnetic material layer is formed by compounding heavy metal and magnetic material, and different types of space seed bags are carried in the region, close to the first interdigital electrode 201, of the magnetic material;
The first interdigital electrode 201 is connected with a pulse voltage source, and under the alternating pulse voltage applied by the pulse voltage source, the upper surface of the piezoelectric material layer 3 generates surface acoustic waves (namely shear strain waves) which are conducted into the magnetic material through heavy metals so as to drive the Sjogren pouch.
Further, in the present example, a protective layer 5 is provided outside the entire device including the heavy metal-magnetic material layer 1, the first interdigital electrode 201, the second interdigital electrode 202, the piezoelectric material layer 3, the substrate layer 4; the protection layer 5 is a cuboid metal cover in this embodiment, and is used to prevent the device structure from being interfered by the outside, and influence the mode switching.
Further, the type of the cassia seed in the cassia seed bag is a Naer type ferromagnetic cassia seed; the number of the cassia seeds in the cassia seed bag is N, and the relation between the number of the cassia seeds and the topological charges of the cassia seeds is Q=N-1. If the number of the cassia seeds in the two cassia seed bags is different, the two cassia seed bags are different types of cassia seed bags.
Further, the heavy metal-magnetic material layer 1 is made of cobalt-platinum or cobalt-iron-boron-platinum, and the thickness of the heavy metal-magnetic material layer is 5-20 nm. In this example, the heavy metal-magnetic material layer 1 was set to have a thickness of 5nm, a length of 2 μm and a width of 0.3 μm. The heavy metal-magnetic material layer 1 is prepared by a magnetron sputtering or evaporation method.
Further, the materials of the first interdigital electrode 201 and the second interdigital electrode 202 are platinum, gold or silver, and the thickness thereof is 10-20 nm.
Further, the edge of the piezoelectric material layer 3 is provided with gradient damping for eliminating reflection interference of surface acoustic waves. The piezoelectric material layer 3 is made of lead zirconate titanate or polyvinylidene fluoride, and the thickness of the piezoelectric material layer is 1-10 mu m.
Further, the piezoelectric material layer 3 generates a surface acoustic wave by the inverse piezoelectric effect, as shown in (C) of fig. 4, which shows a waveform diagram of a displacement component in the y direction at 10 GHz. FIG. 3 illustrates the operation of the device, with arrows showing the direction of movement of the Sjog seed packets pinned to the magnetic nanoribbon. Wherein, the two ends of the piezoelectric material layer along the x direction are provided with high elastic damping to eliminate the reflection influence of the surface acoustic wave. The magnetic moment (mz) profile of a strip film carrying a n=6 magnetic segrain pouch along the z-direction is shown. Based on the material continuity of the piezoelectric material layer 3 and the heavy metal-magnetic material layer 1, the piezoelectric material layer 3 in the region of the left interdigital electrode 2 generates a surface acoustic wave under the action of alternating voltage, which propagates from left to right and transmits the surface acoustic wave waveform to the heavy metal-magnetic material layer 1. The thickness of the piezoelectric material layer 3 is 2 mu m, and lead zirconate titanate or polyvinylidene fluoride material is adopted, wherein high elastic damping is arranged at two ends of the piezoelectric material layer along the x direction so as to eliminate the reflection influence of surface acoustic waves.
Based on the above inventive concept, the embodiment of the present invention further provides a method for driving a magnetic bag to move by using a surface acoustic wave, and the device for driving a magnetic bag to move based on the surface acoustic wave provided by the above embodiment includes the following steps:
Under the alternating pulse voltage applied to the first interdigital electrode 201, the piezoelectric material layer 3 is deformed, and the surface acoustic wave is generated on the upper surface of the piezoelectric material layer 3; the maximum sound wave amplitude of the surface sound wave is controlled by the amplitude of the alternating pulse voltage and the piezoelectric constant of the piezoelectric material layer 3;
The surface acoustic wave propagates from left to right (i.e. propagates from the first interdigital electrode 201 to the second interdigital electrode 202), and is conducted to the magnetic material through the heavy metal, so that magnetocrystalline anisotropy in the magnetic material is changed, and a dynamic strain gradient is generated;
under the action of dynamic strain gradient, the space between the magnetic material and the first interdigital electrode 201 is controlled to be in a stable initial state, and the space between the magnetic material and the second interdigital electrode 202 is controlled to be in a stable initial state;
the second interdigital electrode 202 receives a response generated by the transfer surface acoustic wave.
It should be noted that, because the heavy metal-magnetic material layer 1 and the piezoelectric material layer 3 have a good interface bonding effect, and the thickness of the piezoelectric material layer 3 is far greater than that of the heavy metal-magnetic material layer 1, it can be approximately considered that the surface shear strain wave of the heavy metal-magnetic material layer 1 is consistent with the upper surface shear strain wave of the piezoelectric material layer 3.
In this embodiment, the pulse voltage used is an alternating sinusoidal pulse voltage for generating continuous surface acoustic waves. The surface acoustic wave driven magnetic bag was simulated by taking parity as an example, and the results are shown in fig. 4 and 5. Specifically, in fig. 4, (a) is a movement in which the number of the stokes in the pocket is odd, that is, n=5, and (B) in fig. 4 is a movement in which the number of the stokes in the pocket is even, that is, n=6. Fig. 4 (C) shows the y-direction displacement change after the surface acoustic wave excitation. FIG. 5 is a time-varying plot of the position change of a drive-by-sound-wave-based space-time bag, wherein the time points of the marked data points correspond one-to-one to the time points of the sample simulation of FIG. 4. By applying the surface acoustic wave, the dynamic moving processes such as start-acceleration movement-stop of the cassia-seed bag can be realized. The reason that n=6 is faster than n=5 is that the larger number of the cassia seeds in the bag can cause the larger volume of the cassia seeds due to repulsive force between the cassia seeds, and the earlier contact boundary, the strip boundary can generate an acceleration process for the cassia seed bag due to the repulsive force of the cassia seeds and the action of magnus force of the strip boundary on the cassia seed bag.
It should be noted that the embodiment of the invention also provides a storage chip, which comprises a chip main body and the device for driving the magnetic berg bag to move based on the surface acoustic wave, wherein the device is arranged on the storage chip main body.
The embodiment of the invention also provides a storage circuit, which comprises a circuit board main body and a storage chip, wherein the storage chip is arranged on the circuit board main body.
The embodiment of the invention also provides a storage device which comprises a shell and the storage circuit.
In summary, the invention provides a device and a method for driving a magnetic bag to move by using surface acoustic waves, which are used for controlling the surface acoustic wave response of a piezoelectric material layer through a first interdigital electrode to generate dynamic surface acoustic wave waveforms so as to realize the dynamic movement process of the magnetic bag pinned on a magnetic nano strip. The structure of the invention is easy to prepare, the method is simple, and the invention has potential application prospect in the fields of memory devices, logic devices, multi-data information coding and the like.
Claims (10)
1. A device for driving a magnetic bag to move based on surface acoustic waves, comprising: a piezoelectric material layer (3) is arranged above the substrate layer (4), and a heavy metal-magnetic material layer (1), a first interdigital electrode (201) and a second interdigital electrode (202) are arranged above the piezoelectric material layer (3); wherein, the first interdigital electrode (201) and the second interdigital electrode (202) are respectively positioned at two ends of the heavy metal-magnetic material layer (1);
The heavy metal-magnetic material layer is formed by compounding heavy metal and magnetic material, and different types of space-time diagram bags are carried in the region, close to the first interdigital electrode (201), of the magnetic material;
The first interdigital electrode (201) is connected with a pulse voltage source, and under alternating pulse voltage applied by the pulse voltage source, surface acoustic waves are generated on the upper surface of the piezoelectric material layer (3) and are conducted into the magnetic material through heavy metals so as to drive the Sjog seed bags.
2. The device for driving a magnetic sigma-delta bag to move based on a surface acoustic wave according to claim 1, wherein the type of the sigma-delta in the sigma-delta bag is a neled ferromagnetic sigma-delta; the number of the cassia seeds in the cassia seed bag is N, and the relation between the number of the cassia seeds and the topological charges of the cassia seeds is Q=N-1.
3. The apparatus of claim 1, wherein the surface acoustic wave drives the magnetic bag to move, if the number of the cassia seeds in the two cassia seed bags is different, the two cassia seed bags are different types of cassia seed bags.
4. Device for driving a magnetic bag according to claim 1, characterized in that the edge of the layer of piezoelectric material (3) is provided with gradient damping for eliminating the reflection disturbance of the surface acoustic wave.
5. The device for driving the movement of the magnetic berg bag based on the surface acoustic wave according to claim 1, wherein the thickness of the piezoelectric material layer (3) is 1-10 μm, the thickness of the heavy metal-magnetic material layer (1) is 5-20 nm, and the thicknesses of the first interdigital electrode (201) and the second interdigital electrode (202) are 10-20 nm.
6. The device for driving the movement of the magnetic stigmine bag based on the surface acoustic wave according to claim 1, wherein the materials of the first interdigital electrode (201) and the second interdigital electrode (202) are platinum, gold or silver; the piezoelectric material layer (3) is made of lead zirconate titanate or polyvinylidene fluoride; the heavy metal-magnetic material layer (1) is made of cobalt-platinum or cobalt-iron-boron-platinum.
7. A method of driving movement of a magnetic bag based on surface acoustic waves, characterized in that the method is implemented based on the device of any one of claims 1-5, the method comprising:
Under the alternating pulse voltage applied to the first interdigital electrode (201), the piezoelectric material layer (3) is deformed, and the upper surface of the piezoelectric material layer (3) generates surface acoustic waves; the maximum sound wave amplitude of the surface sound wave is controlled by the amplitude of the alternating pulse voltage and the piezoelectric constant of the piezoelectric material layer (3);
the surface acoustic wave propagates from left to right, and is conducted to the magnetic material through heavy metal, so that magnetocrystalline anisotropy in the magnetic material is changed, and a dynamic strain gradient is generated;
under the action of dynamic strain gradient, enabling the space between the magnetic material and the first interdigital electrode (201) to be in a stable initial state, and enabling the space between the magnetic material and the second interdigital electrode (202) to be in a stable initial state under the limitation of the boundary of the magnetic material, so as to drive the space between the magnetic material and the second interdigital electrode (202);
The second interdigital electrode (202) receives a response generated by the transmitted surface acoustic wave.
8. A memory chip comprising a chip body and a device for driving movement of a magnetic segetum pouch based on surface acoustic waves as claimed in any one of claims 1 to 5, wherein the device is disposed on the memory chip body.
9. A storage circuit comprising a circuit board body and the storage chip of claim 8, wherein the storage chip is disposed on the circuit board body.
10. A storage device comprising a housing and the storage circuit of claim 9.
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| CN117741526A (en) * | 2023-11-27 | 2024-03-22 | 上海师范大学 | Surface acoustic wave magnetic field sensor based on magnetic berg seeds |
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2024
- 2024-08-05 CN CN202411060616.8A patent/CN118590816A/en active Pending
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