The influence of the conditions of preparation (magnetron spraying) and subsequent annealing on t... more The influence of the conditions of preparation (magnetron spraying) and subsequent annealing on the structure and chemical composition of Fe - Zr - Al-N-O ribbons is investigated; these ribbons may be promising for use inthe magnetic heads of high-density, high-quality recording equipment. A method of producing Fe-Zr-Al-N-O alloy ribbons containing 1.5 at. % Zr, 1.5 at. % Al, ≤25. at. % N, and ≤6 at. % O is developed. The quantitative relationship between the nitrogen and oxygen content in the spraying atmosphere and the concentration of these elements in the alloy ribbon is established. Annealing the ribbons in vacuum at 400 and 550°C reduces the nitrogen content. X-Ray diffraction data on the structure and phase composition of the ribbons in the initial state and after annealing indicate that only a bcc solid solution based on a Fe is formed in initial ribbons containing up to 7 at. % N and 6 at. % O, while only oxide and/or nitride phases (Fe 3 N or Al 2 O 3 and ZrN) appear in ri...
1.An increase of the amount of dispersed oxide phase increases hardening during deformation.2.Wit... more 1.An increase of the amount of dispersed oxide phase increases hardening during deformation.2.Within the limits of the compositions studied, dispersed oxide phase raises the recrystallization temperature by 175–200°C and inhibits grain growth.3.Coalescence and solution of the dispersed phase accelerate the migration of boundaries and grain growth.4.The nature of the phase (within the limits investigated, ZrO2 and HfO2) has little effect
Data on the random magnetic anisotropy and exchange correlation length in soft magnetic nanocryst... more Data on the random magnetic anisotropy and exchange correlation length in soft magnetic nanocrystalline Fe79Zr10N11 films were obtained using a calculation technique in frame of the random magnetic anisotropy model. The calculations are performed using approach magnetization to saturation curves. The local magnetic anisotropy fields (Ha), and magnetic anisotropy correlation radii (Rс) reduced to =(A/K)1/2 were determined for the films annealed at 475 and 6000 C for 0.5, 1, 2, and 3 h. The correlation Hc ~(Rc/)3 for the all annealed films was found.
ABSTRACT Fe79Zr10N11 films 0.7 μm thick deposited on glass substrates have been produced by rf re... more ABSTRACT Fe79Zr10N11 films 0.7 μm thick deposited on glass substrates have been produced by rf reactive magnetron sputtering. The films are a soft magnetic material, which can exhibit a combination of a high saturation inductance and a low coercive force and, therefore, shows promise as magnetic recording cores for the high-density magnetic recording. The results of X-ray diffraction studies of the phase and structural states of the films and the effect of annealing on these states are considered.
The Fe 99.2÷56.6 Ti 0÷13.2 B 0÷34 films were prepared by dc magnetron deposition on glass substra... more The Fe 99.2÷56.6 Ti 0÷13.2 B 0÷34 films were prepared by dc magnetron deposition on glass substrates. X-ray diffraction analysis was used to determine the phase composition, volume fractions of formed crystalline phases, their grain sizes and microstrains on the grain scale. The magnetic hysteretic properties, saturation induction Bs (2.1-0.3 T), coercive field Hc (0.6-6 kA/m), relative remanence Br/Bs (0.07-0.37), were determined using measured hysteresis loops. Their shapes indicate the existence of intergranular exchange interaction in all studied films. The magnetic structure parameters of the films were determined by correlation magnetometry. All films are characterized by a stochastic magnetic structure. The magnetic properties and the magnetic structure parameters of the films are substantiated by their phase and structural states. The values of the local parameters of the magnetic structure (rms local anisotropy field D^1/2 Ha and exchange field HR) follow the parameters of the grain (lattice parameter and grain size), while the macroscopic parameters (Hc and rms stochastic domain anisotropy field D^1/2 <Ha >) have a more complex behavior.
IOP Conference Series: Materials Science and Engineering, 2020
The Fe-Ti-B films were obtained by dc magnetron sputtering of the Fe + 15% TiB2 and Fe + 30% TiB2... more The Fe-Ti-B films were obtained by dc magnetron sputtering of the Fe + 15% TiB2 and Fe + 30% TiB2 targets. The chemical composition and structure were studied in the as-sputtered state and after vacuum annealing at 500°C. The static (saturation magnetization Ms and coercive field Hc ) and rf magnetic properties (magnetic permeability µ’, frequency of natural ferromagnetic resonance fr and the frequency range in which µ’ is kept) were determined.
The magnetic structure of Fe(100-x)Zr(x) films (x = 0, 0.6, 1.8, 2.9, and 4.1 +/- 0.1 at%), which... more The magnetic structure of Fe(100-x)Zr(x) films (x = 0, 0.6, 1.8, 2.9, and 4.1 +/- 0.1 at%), which is characterized by the existence of stochastic domains determined by correlation magnetometry method, is discussed in terms of the random anisotropy model. It is found that two modes of the magnetic anisotropy field of stochastic domains are formed, which differ in the exchange stiffness magnitude and determine the existence of two modes of the coercive field found in the magnetic hysteresis loops.
The influence of the conditions of preparation (magnetron spraying) and subsequent annealing on t... more The influence of the conditions of preparation (magnetron spraying) and subsequent annealing on the structure and chemical composition of Fe - Zr - Al-N-O ribbons is investigated; these ribbons may be promising for use inthe magnetic heads of high-density, high-quality recording equipment. A method of producing Fe-Zr-Al-N-O alloy ribbons containing 1.5 at. % Zr, 1.5 at. % Al, ≤25. at. % N, and ≤6 at. % O is developed. The quantitative relationship between the nitrogen and oxygen content in the spraying atmosphere and the concentration of these elements in the alloy ribbon is established. Annealing the ribbons in vacuum at 400 and 550°C reduces the nitrogen content. X-Ray diffraction data on the structure and phase composition of the ribbons in the initial state and after annealing indicate that only a bcc solid solution based on a Fe is formed in initial ribbons containing up to 7 at. % N and 6 at. % O, while only oxide and/or nitride phases (Fe 3 N or Al 2 O 3 and ZrN) appear in ri...
1.An increase of the amount of dispersed oxide phase increases hardening during deformation.2.Wit... more 1.An increase of the amount of dispersed oxide phase increases hardening during deformation.2.Within the limits of the compositions studied, dispersed oxide phase raises the recrystallization temperature by 175–200°C and inhibits grain growth.3.Coalescence and solution of the dispersed phase accelerate the migration of boundaries and grain growth.4.The nature of the phase (within the limits investigated, ZrO2 and HfO2) has little effect
Data on the random magnetic anisotropy and exchange correlation length in soft magnetic nanocryst... more Data on the random magnetic anisotropy and exchange correlation length in soft magnetic nanocrystalline Fe79Zr10N11 films were obtained using a calculation technique in frame of the random magnetic anisotropy model. The calculations are performed using approach magnetization to saturation curves. The local magnetic anisotropy fields (Ha), and magnetic anisotropy correlation radii (Rс) reduced to =(A/K)1/2 were determined for the films annealed at 475 and 6000 C for 0.5, 1, 2, and 3 h. The correlation Hc ~(Rc/)3 for the all annealed films was found.
ABSTRACT Fe79Zr10N11 films 0.7 μm thick deposited on glass substrates have been produced by rf re... more ABSTRACT Fe79Zr10N11 films 0.7 μm thick deposited on glass substrates have been produced by rf reactive magnetron sputtering. The films are a soft magnetic material, which can exhibit a combination of a high saturation inductance and a low coercive force and, therefore, shows promise as magnetic recording cores for the high-density magnetic recording. The results of X-ray diffraction studies of the phase and structural states of the films and the effect of annealing on these states are considered.
The Fe 99.2÷56.6 Ti 0÷13.2 B 0÷34 films were prepared by dc magnetron deposition on glass substra... more The Fe 99.2÷56.6 Ti 0÷13.2 B 0÷34 films were prepared by dc magnetron deposition on glass substrates. X-ray diffraction analysis was used to determine the phase composition, volume fractions of formed crystalline phases, their grain sizes and microstrains on the grain scale. The magnetic hysteretic properties, saturation induction Bs (2.1-0.3 T), coercive field Hc (0.6-6 kA/m), relative remanence Br/Bs (0.07-0.37), were determined using measured hysteresis loops. Their shapes indicate the existence of intergranular exchange interaction in all studied films. The magnetic structure parameters of the films were determined by correlation magnetometry. All films are characterized by a stochastic magnetic structure. The magnetic properties and the magnetic structure parameters of the films are substantiated by their phase and structural states. The values of the local parameters of the magnetic structure (rms local anisotropy field D^1/2 Ha and exchange field HR) follow the parameters of the grain (lattice parameter and grain size), while the macroscopic parameters (Hc and rms stochastic domain anisotropy field D^1/2 <Ha >) have a more complex behavior.
IOP Conference Series: Materials Science and Engineering, 2020
The Fe-Ti-B films were obtained by dc magnetron sputtering of the Fe + 15% TiB2 and Fe + 30% TiB2... more The Fe-Ti-B films were obtained by dc magnetron sputtering of the Fe + 15% TiB2 and Fe + 30% TiB2 targets. The chemical composition and structure were studied in the as-sputtered state and after vacuum annealing at 500°C. The static (saturation magnetization Ms and coercive field Hc ) and rf magnetic properties (magnetic permeability µ’, frequency of natural ferromagnetic resonance fr and the frequency range in which µ’ is kept) were determined.
The magnetic structure of Fe(100-x)Zr(x) films (x = 0, 0.6, 1.8, 2.9, and 4.1 +/- 0.1 at%), which... more The magnetic structure of Fe(100-x)Zr(x) films (x = 0, 0.6, 1.8, 2.9, and 4.1 +/- 0.1 at%), which is characterized by the existence of stochastic domains determined by correlation magnetometry method, is discussed in terms of the random anisotropy model. It is found that two modes of the magnetic anisotropy field of stochastic domains are formed, which differ in the exchange stiffness magnitude and determine the existence of two modes of the coercive field found in the magnetic hysteresis loops.
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Papers by Elena Sheftel