Search Results - "Bolyachkin, A."

Machine Learning Approach for Evaluation of Nanodefects and Magnetic Anisotropy in FePt Granular Films by Dengina, E., Bolyachkin, A., Sepehri-Amin, H., Hono, K.

“…This paper reports a machine learning approach for evaluating micromagnetic and microstructural parameters from demagnetization curves of FePt granular films…”
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Machine learning assisted development of Fe2P-type magnetocaloric compounds for cryogenic applications by Lai, Jiawei, Bolyachkin, A., Terada, N., Dieb, S., Tang, Xin, Ohkubo, T., Sepehri-Amin, H., Hono, K.

“…Fe2P-type compounds exhibit a giant magnetocaloric effect (MCE) and are extensively studied for room temperature applications. The reduction of their…”
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Peculiar behavior of V on the Curie temperature and anisotropy field of SmFe12-xVx compounds by Tozman, P., Fukazawa, T., Ogawa, D., Sepehri-Amin, H., Bolyachkin, A., Miyake, T., Hirosawa, S., Hono, K., Takahashi, Y.K.

“…The effect of V on the phase stability and intrinsic magnetic properties of SmFe12-xVx (0 ≤ x ≤ 1.9) thin films, and bulk SmFe12-xVx (x = 1.5 and 2) are…”
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Coercivity engineering in Sm(Fe0.8Co0.2)12B0.5 thin films by Si grain boundary diffusion by Bolyachkin, A., Sepehri-Amin, H., Kambayashi, M., Mori, Y., Ohkubo, T., Takahashi, Y.K., Shima, T., Hono, K.

“…Achieving a large coercivity in the SmFe12-based compounds with excellent intrinsic magnetic properties is the main challenge toward the development of new…”
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Transmission electron microscopy image based micromagnetic simulations for optimizing nanostructure of FePt-X heat-assisted magnetic recording media by Bolyachkin, A., Sepehri-Amin, H., Suzuki, I., Tajiri, H., Takahashi, Y.K., Srinivasan, K., Ho, H., Yuan, H., Seki, T., Ajan, A., Hono, K.

“…The areal density of the heat-assisted magnetic recording (HAMR) technology has a potential to reach 4 Tb/in2. However, the bimodal grain size distribution and…”
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Combined Micromagnetic Simulation and Machine Learning Approach to Analysis of Polycrystalline Bilayer With Exchange Bias by Kulesh, N., Permyakov, N., Zverev, V., Koshelev, A., Bolyachkin, A., Vas'kovskiy, V.

“…Exchange bias (EB) is a complex interface phenomenon often used in multiple applications ranging from magnetic field sensors to spintronics and neuromorphic…”
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Dual-layer FePt-C granular media for multi-level heat-assisted magnetic recording by Tozman, P., Isogami, S., Suzuki, I., Bolyachkin, A., Sepehri-Amin, H., Greaves, S.J., Suto, H., Sasaki, Y., Chang, T.Y., Kubota, Y., Steiner, P., Huang, P.W., Hono, K., Takahashi, Y.K.

“…Multi-level magnetic recording is a new concept for increasing the data storage capacity of hard disk drives. However, its implementation has been limited by a…”
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Angular dependence of saturation magnetization in single crystals with uniaxial magnetic anisotropy by Neznakhin, D.S., Bolyachkin, A.S., Bartashevich, M.I., Diop, L.V.B., Gutfleisch, O., Skokov, K.P.

“…•Saturation magnetizations (MS) along easy and hard axes varies by 7.9% in Y2Co7 at RT.•The effect of sample shape on the evaluation of MS anisotropy was…”
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Micromagnetic modelling of stripe domains in thin films with a columnar microstructure by Dengina, E. Yu, Bolyachkin, A. S., Kulesh, N. A., Vas’kovskiy, V. O.

“…A micromagnetic model of thin films with columnar microstructure in the form of a matrix with reduced magnetic properties and embedded columns with high aspect…”
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Effect of Selective Thermomagnetic Treatment on Unidirectional Magnetic Anisotropy in FeNi/TbCo Films by Balymov, K. G., Kulesh, N. A., Bolyachkin, A. S., Turygin, A. P., Vas’kovskiy, V. O., Adanakova, O. A., Kudyukov, E. V.

“…The effect of selective thermomagnetic treatment on the exchange interaction between magnetic layers in Fe 11 Ni 89 /Tb 30 Co 70 /Ti films has been…”
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δM plots of nanocrystalline hard magnetic alloys by Bolyachkin, A.S., Alekseev, I.V., Andreev, S.V., Volegov, A.S.

“…•Simulations of δM(H) plots of nanocrystalline hard magnetic alloys were performed.•Intergrain exchange interaction constant was estimated from δM(H) of…”
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Structure and magnetic properties of (Sm0.9Zr0.1)Fe11Ti alloys with ThMn12-type structure by Neznakhin, D.S., Andreev, S.V., Semkin, M.A., Selezneva, N.V., Volochaev, M.N., Bolyachkin, A.S., Kudrevatykh, N.V., Volegov, A.S.

“…•Melt-spun (Sm0.9Zr0.1)Fe11Ti alloy with ThMn12-type structure was synthesized.•Structural and phase transformations of the alloy were studied with heat…”
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Magnetization jumps in nanostructured Nd–Fe–B alloy at low temperatures by Neznakhin, D.S., Bolyachkin, A.S., Volegov, A.S., Markin, P.E., Andreev, S.V., Kudrevatykh, N.V.

“…Magnetic properties of the nanostructured isotropic alloy on the base of Nd2Fe14B type phase were investigated at low temperatures. The evaluated average grain…”
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Characterisation of high-anisotropy nanocrystalline alloys based on magnetic susceptibilities in the remanent state by Bolyachkin, A.S., Ruta, S., Chantrell, R.W., Woodcock, T.G., Andreev, S.V., Selezneva, N.V., Volegov, A.S.

“…•Magnetic susceptibilities of nanocrystalline alloys are studied in the remanent state.•Local interactions induce difference in longitudinal and transverse…”
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(Nd,La,Ce)-Fe-B hot-deformed magnets for application of variable-magnetic-force motors by Tang, Xin, Sepehri-Amin, H., Bolyachkin, A., Ohkubo, T., Hono, K.

“…The recent development of variable-magnetic-force (VMF) motors has raised a new demand for permanent magnets with a moderate coercivity and magnetizing field…”
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Data-driven optimization of FePt heat-assisted magnetic recording media accelerated by deep learning TEM image segmentation by Kulesh, N., Bolyachkin, A., Suzuki, I., Takahashi, Y.K., Sepehri-Amin, H., Hono, K.

“…The main bottleneck for heat-assisted magnetic recording (HAMR) to achieve a potential areal density of 4 Tb/in2 is the difficulty in obtaining FePt-X…”
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Power-law behavior of coercivity in nanocrystalline magnetic alloys with grain-size distribution by Bolyachkin, A.S., Komogortsev, S.V.

“…Coercivity of nanocrystalline magnetic alloys depends on the grain size D according to a power law Hc ∝ Dn with n from 2 to 6. The law Hc ∝ D6 is derived based…”
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Coercivity limits in Nd-Fe-B hot-deformed magnets with ultrafine microstructure by Kulesh, N., Bolyachkin, A., Dengina, E., Tang, Xin, Ohkubo, T., Kajiwara, T., Miyawaki, H., Sepehri-Amin, H., Hono, K.

“…In this work, we developed a series of anisotropic hot-deformed Nd-Fe-B magnets with ultrafine grain sizes varying from 125 nm to 234 nm in the lateral…”
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Microstructure and extrinsic magnetic properties of anisotropic Sm(Fe,Ti,V)12-based sintered magnets by Zhang, J.S., Tang, Xin, Bolyachkin, A., Srinithi, A.K., Ohkubo, T., Sepehri-Amin, H., Hono, K.

“…Anisotropic SmFe12-based sintered magnets require an optimum microstructure and alloy composition to have a large coercivity μ0Hc and remanent magnetization…”
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Analysis of a Spin-Torque Oscillator Using Injection Locking to an External Microwave Field by Suto, H., Asam, N., Tamaru, S., Sepehri-Amin, H., Bolyachkin, A., Zhou, W., Nakatani, T., Kubota, H., Sakuraba, Y.

“…A spin-torque oscillator (STO) is a key device in microwave-assisted magnetic recording (MAMR). Conventionally, the magnetization dynamics of STOs has been…”
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