Article
Chemistry, Multidisciplinary
Xuejie Xie, Xiujuan Wang, Wei Wang, Xiaonan Zhao, Lihui Bai, Yanxue Chen, Yufeng Tian, Shishen Yan
Summary: In this study, the controllable manipulation of multiple spin configurations is achieved by controlling long-range oscillatory interlayer coupling and neighboring ferrimagnetic coupling. This is done by integrating the advantages of ferromagnetic, ferrimagnetic, and antiferromagnetic spin configurations into a synthetic antiferromagnetic (SAF) heterostructure.
ADVANCED MATERIALS
(2023)
Article
Physics, Applied
BingJin Chen, James Lourembam, Hong Jing Chung, Sze Ter Lim
Summary: Field-free magnetization switching of a ferromagnetic layer is achieved through spin-orbit torque (SOT) induced antiferromagnetic interlayer exchange coupling (IEC). Magnetization reversal can be achieved within sub-ns under appropriate conditions, with the complete reversal occurring upon removing the current pulse. Furthermore, the critical current density (J(c)) shows a parabolic dependence on the nanomagnet's diameter, with the vertex occurring at 90nm.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Chemistry, Physical
Cristina Bormio-Nunes, Fabio Martins Cardoso, Rodolfo da Silva Teixeira, Jhonatan Feitoza Bastos
Summary: This study investigated the magnetic properties and electrical resistivity of FeCoNi(CuAl)x alloys in different forms. It was found that high annealing temperature and thermomechanical processing affected the microstructure and magnetic properties of the alloys. The alloy with CuAl=1.6 showed an unexpected improvement in saturation magnetization, which was attributed to the formation of Cu-rich nanoprecipitates.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Ceramics
Xi Huang, Song Ding, Zemin Wang, Lianbo Wang, Min Liu, Zhanyong Wang, Xue Liang, Wenqing Liu
Summary: In this study, the microstructure and magnetic properties of Fe83Si6B6Cu1Nb1P1.5C1.5 amorphous ribbons annealed at different temperatures were systematically investigated using X-ray diffraction (XRD) and atom probe tomography (APT). The results reveal that the nucleation of α-Fe(Si) nanocrystalline phase is promoted by the pre-precipitated Cu clusters, providing heterogeneous nucleation sites. The presence of residual amorphous B, P, and C elements in the form of a core-shell structure around the α-Fe(Si) phase restricts the growth of nanocrystalline α-Fe(Si) grains at high temperature. The highest saturation magnetization value of the ribbons is achieved at 184.25 emu/g for samples annealed at 550 degrees C for 30 min.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2022)
Article
Chemistry, Physical
Z. G. Zheng, Y. B. Chen, J. Wei, X. Wang, Z. G. Qiu, D. C. Zeng
Summary: The effects of Fe content and annealing temperature on the microstructure, thermal stability, and soft magnetic properties of Fe-rich alloys were investigated. Increasing Fe content up to 85% allowed the formation of a single amorphous phase, but beyond that, crystalline phase appeared. Higher Fe content resulted in a larger crystallization temperature interval, contributing to the process of heat treatment and preparation of amorphous/nanocrystalline soft magnetic materials. The optimum annealing treatment at 430℃ for 10 minutes yielded a high saturation magnetization of 208 emu/g.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Physics, Applied
Haodong Fan, Menghao Jin, Birui Wu, Mingzhang Wei, Jiale Wang, Ziji Shao, Changqiu Yu, Jiahong Wen, Hai Li, Wenjun Li, Tiejun Zhou
Summary: In this paper, the spin-orbit torque (SOT) switching problem of Co/Ir/CoFeB alloys with perpendicular magnetic anisotropy and strong exchange coupling was studied. The complete field-free switching was achieved by depositing the alloys on crystal miscut Al2O3 substrates. It was also demonstrated that the tilted magnetic anisotropy caused by crystal miscut was due to the transverse asymmetry. Moreover, the crystal miscut enhanced the efficiency of SOT. These findings provide a potential solution for reliable field-free switching and high-efficiency SOT of Ir-CoFeB-based alloys.
APPLIED PHYSICS LETTERS
(2023)
Article
Engineering, Electrical & Electronic
Keli Zhao, Peng Pang, Jian Luo, Binghe Ma, Wei Gao, Jinjun Deng
Summary: In this article, an annealing method is proposed to optimize the coercivity and magnetization of deposited Terfenol-D film for its application in weak magnetic sensors. The magnetization can be improved by releasing compressive stress and increasing saturation magnetization. The coercivity decreases and then sharply increases with the annealing temperature due to partial crystallization. The annealed film with low coercivity of 12.6 Oe and high magnetization of 0.29 emu/g at 525°C can enhance the application of Terfenol-D in weak magnetic sensors.
IEEE TRANSACTIONS ON MAGNETICS
(2023)
Article
Materials Science, Multidisciplinary
Shaktiranjan Mohanty, Minaxi Sharma, Ashish Kumar Moharana, Brindaban Ojha, Esita Pandey, Braj Bhusan Singh, Subhankar Bedanta
Summary: This article investigates the effect of varying the number of bilayer stacks and thickness of spacer layers on magnetization reversal, showing different FM and AFM coupling behaviors, as well as distinctive hysteresis loops at different thicknesses. Additionally, strain-induced modifications of IEC and magnetization reversal phenomena were observed, suggesting the potential of SAFs in flexible spintronics.
Article
Engineering, Electrical & Electronic
Clemens Muehlenhoff, Michal Krupinski, Arkadiusz Zarzycki, Manfred Albrecht
Summary: In this study, the magnetotransport properties of Co/Pt based perpendicular synthetic antiferromagnetic (p-SAF) structures with Ru interlayers were investigated. The number of Co/Pt multilayer (ML) stacks and Ru interlayers in the p-SAF structures were varied to examine changes in their magnetoresistive effects. The alignment of magnetization directions of the MLs in the ML/Ru/ML stacks of the p-SAF generated a giant magnetoresistance effect (GMR), while the anisotropic magnetoresistance effect (AMR) at each ML further influenced the resistance of the system. The study results have important implications for understanding and application of magnetoresistive effects.
IEEE SENSORS JOURNAL
(2022)
Article
Physics, Applied
Yang Li, Xiaotian Zhao, Wei Liu, Jinxiang Wu, Long Liu, Yuhang Song, Jun Ma, Zhidong Zhang
Summary: In this study, voltage-controlled, field-free switching of spin-orbit torque in perpendicular magnetized Pt/Co/Ir/MgO structures with wedged iridium interlayers is reported. The insertion of a thin iridium interlayer at the ferromagnet/oxide interface significantly reduces the perpendicular magnetic anisotropy, breaking lateral structural symmetry and enabling deterministic switching without the need for in-plane magnetic fields. The critical switching currents are remarkably decreased by 29% under a positive 6 V gate voltage, with multiple factors contributing to the decrease, including a reduction in magnetic anisotropy energy, nucleation field, and a minor enhancement in the damping-like torque under gate voltage.
APPLIED PHYSICS LETTERS
(2023)
Article
Engineering, Electrical & Electronic
Vladimir V. Zverev, Ivan M. Izmozherov
Summary: This article investigates the effect of domain wall motion in a magnetic film with an antidot array on magnetization dynamics. Micromagnetic simulations and calculations of vortex structures are used to explore the phenomenon of magnetization reversal zone passing through or freezing on the antidot array and its relationship with vortex structure types.
IEEE TRANSACTIONS ON MAGNETICS
(2022)
Article
Materials Science, Ceramics
J. Lopez- Medina, J. Vazquez-Arce, P. Piza-Ruiz, N. Nedev, M. H. Farias, H. Tiznado
Summary: In this study, ultrathin nanolaminate structures were prepared by thermal atomic layer deposition method, and the optical behavior of these structures as a function of bilayer thickness and annealing temperature was investigated. The results showed that the refractive index increased when the bilayer thickness decreased, and the optical bandgap varied significantly. These findings demonstrate the potential of ultrathin nanolaminate structures as dielectric materials for electronic and optoelectronic devices.
CERAMICS INTERNATIONAL
(2022)
Article
Engineering, Electrical & Electronic
Upasana Sahu, Naven Sisodia, Pranaba Kishor Muduli, Debanjan Bhowmik
Summary: We propose a ferrimagnetic domain-wall synapse device as an alternative to its ferromagnetic counterpart for faster and more energy-efficient on-chip learning on a crossbar-array-based analog-hardware neural network. By using micromagnetics, we model the domain-wall motion in the ferrimagnetic device and show that it has a higher velocity compared to the ferromagnetic device at room temperature. Integrating the results into a fully connected neural network simulation, we demonstrate that the ferrimagnetic-synapse-based network consumes five times less energy and takes five times less time for on-chip learning compared to the ferromagnetic-synapse-based network.
IEEE TRANSACTIONS ON ELECTRON DEVICES
(2022)
Article
Chemistry, Physical
Shanigaram Mallesh, Pradip Mondal, Srikanti Kavita, Veeturi Srinivas, Young-Woo Nam
Summary: Magnetic spinel ferrite nanoparticles have broad applications, and Ni-substituted MnZn ferrites show superior magnetic properties and crystallinity, with potential applications in materials science and biomedicine.
APPLIED SURFACE SCIENCE
(2022)
Article
Engineering, Mechanical
Biaohui Li, Jinhao Zhang, Haiping Tian, Xingyu Ma, Zhanqi Tang, Nan Jiang
Summary: The research focuses on the active control scheme of a fully-developed turbulent boundary layer forced by a submerged synthetic jet. Experimental results show that the synthetic jet can reduce wall-friction drag and affect events in a certain range downstream. The control method studied the suppression effect of the correlation coefficient in the streamwise direction.
ACTA MECHANICA SINICA
(2022)
Article
Multidisciplinary Sciences
Si Nyeon Kim, Jun Woo Choi, Sang Ho Lim
SCIENTIFIC REPORTS
(2019)
Article
Chemistry, Physical
Dong-Soo Han, Kyujoon Lee, Jan-Philipp Hanke, Yuriy Mokrousov, Kyoung-Whan Kim, Woosuk Yoo, Youri L. W. van Hees, Tae-Wan Kim, Reinoud Lavrijsen, Chun-Yeol You, Henk J. M. Swagten, Myung-Hwa Jung, Mathias Klaeui
Correction
Chemistry, Physical
Dong-Soo Han, Kyujoon Lee, Jan-Philipp Hanke, Yuriy Mokrousov, Kyoung-Whan Kim, Woosuk Yoo, Youri L. W. van Hees, Tae-Wan Kim, Reinoud Lavrijsen, Chun-Yeol You, Henk J. M. Swagten, Myung-Hwa Jung, Mathias Klaui
Article
Physics, Applied
Hyung Keun Gweon, Kyung-Jin Lee, Sang Ho Lim
APPLIED PHYSICS LETTERS
(2019)
Article
Materials Science, Multidisciplinary
Hyung Keun Gweon, Hyeon-Jong Park, Kyoung-Whan Kim, Kyung-Jin Lee, Sang Ho Lim
NPG ASIA MATERIALS
(2020)
Article
Physics, Applied
Eunchong Baek, Indra Purnama, Chun-Yeol You
PHYSICAL REVIEW APPLIED
(2019)
Article
Physics, Applied
Hyung Keun Gweon, Sang Ho Lim
APPLIED PHYSICS LETTERS
(2020)
Article
Physics, Multidisciplinary
Jaehun Cho, Eiiti Tamura, Chaozhe Liu, Soma Miki, Chun-Yeol You, June-Seo Kim, Hikaru Nomura, Minori Goto, Ryoichi Nakatani, Yoshishige Suzuki
NEW JOURNAL OF PHYSICS
(2020)
Article
Physics, Applied
Jinyong Jung, Jaehun Cho, Hyeok-Cheol Choi, Kwanghyun Lee, Chun-Yeol You, Sug-Bong Choe, June-Seo Kim
Summary: The study systematically investigates magnetic properties in structurally inverted Pd/Co/Pt and Pt/Co/Pd tri-layer stacks using inelastic light scattering method, finding that the Pd/Co/Pt system has decreased surface magnetic anisotropy energy density and may be a promising candidate for forming magnetic skyrmion phases.
APPLIED PHYSICS LETTERS
(2021)
Article
Physics, Applied
Suhyeok An, Hyeong-Joo Seo, Eunchong Baek, Soobeom Lee, Chun-Yeol You
Summary: This study investigates the influence of chiral spin configuration on field-free spin-orbit torque-induced magnetization switching. The results show that the stabilized spin configuration plays a crucial role in deterministic switching in the absence of an external field.
APPLIED PHYSICS LETTERS
(2022)
Article
Physics, Applied
Jaehun Cho, Chan-Kang Lee, Joonwoo Kim, June-Seo Kim, Chun-Yeol You
Summary: In this study, the perpendicular magnetic anisotropy (PMA) and interfacial Dzyaloshinskii-Moriya interaction (iDMI) energy density in Ta/Pt/Co/plasma-enhanced oxide layer systems were systematically investigated. The results showed that PMA energy is influenced by both top and bottom interfaces, but the iDMI energy density is mainly affected by the bottom interface.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2022)
Article
Nanoscience & Nanotechnology
Jie Wang, Hyungsub Kim, HyeongJoo Seo, Satoshi Ota, Chun-Yeol You, Yasushi Takemura, Seongtae Bae
Summary: This study systematically investigates the physical role of magnetically semi-hard Co2+ cation addition in enhancing the AC heat induction temperature of solid iron oxide nanoparticles. The enhancement of magnetic anisotropy caused by Co2+ cation addition is the most dominant parameter to enhance the AC heat induction temperature. Therefore, improving the magnetic anisotropy is crucial for enhancing the AC heat induction effect of nanoparticles.
Article
Physics, Applied
S. Miki, K. Hashimoto, J. Cho, J. Jung, C. Y. You, R. Ishikawa, E. Tamura, H. Nomura, M. Goto, Y. Suzuki
Summary: In this study, a technique was developed to fabricate a suitable potential landscape in magnetic films for the diffusion of information carriers. Irradiation with focused ion beams was found to shift the critical temperature of magnetic skyrmions. The effects of ion implantation on the film were analyzed using TOF-SIMS and AFM.
APPLIED PHYSICS LETTERS
(2023)
Article
Materials Science, Multidisciplinary
Eunchong Baek, Suhyeok An, Soobeom Lee, Dongryul Kim, Jun-Su Kim, Ki-Seung Lee, Chun-Yeol You
Summary: We investigated the electric control of antiferromagnetic ordering in Pt/Co/IrMn heterostructures through assist magnetic field. Experimental results with different directions and amplitudes of the assist magnetic field demonstrated the magnetic coupling between ferromagnet and antiferromagnet spins. Furthermore, we found that the magnitude and direction of exchange bias can be manipulated by the magnitude of the current pulse. The observed phenomena can be explained by a numerical macrospin model, indicating the excitation and precession of antiferromagnetic spins mediated by magnetic coupling with the ferromagnet.
Article
Computer Science, Information Systems
Woosuk Yoo, Seongmin Choo, Sinyong Jo, Chun-Yeol You, Jung-Il Hong, Kyujoon Lee, Myung-Hwa Jung
Summary: In this study, the azimuthal dependence of exchange bias effect with respect to varying the composition of antiferromagnet CoxNi1-xO and temperature was established by depositing Ni0.8Fe0.2/CoxNi1-xO bilayer thin films. The results showed good consistency with the spin glass model, suggesting its validity in understanding the origin of exchange bias effect in these bilayers.
