Article
Materials Science, Multidisciplinary
Min Xu, Runshui Li, Dexiang Meng, Jinyu Zhang, Mingming Zhang
Summary: This paper explores the suppression effect on Walker breakdown (WB) by introducing square hole structures, achieving structural stability of domain walls and high-speed motion within a limited time. The size and position of the holes play a crucial role in energy dissipation (?E) and the suppression of WB, with specific dimensions leading to perfect suppression and sustained high-speed movement of magnetic domain walls.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2021)
Article
Mathematics, Applied
Fangyu Han, Zhong Tan, Ganshan Yang
Summary: The paper examines the stability of the Walker domain wall in ferromagnetic thin-film material described by the two-dimensional Landau-Lifshitz equation. By introducing a one-dimensional uniaxial traveling wave solution and conducting high-dimensional perturbations under this framework, the equivalent quasilinear differential system is obtained.
SIAM JOURNAL ON MATHEMATICAL ANALYSIS
(2021)
Article
Chemistry, Multidisciplinary
Ziyang Yu, Bin Gong, Lun Xiong, Xinran Du, Chenhuinan Wei, Rui Xiong, Zhihong Lu, Yue Zhang
Summary: This paper proposes a racetrack memory with the advantages of small size and high reading speed based on current-induced domain wall motion in a ferromagnetic nanowire. The enhancement of domain wall velocity can be achieved by inter-wire magnetostatic coupling in a double nanowire system. By adjusting the magnetic anisotropy constant difference, the manipulation of working current density is possible.
NANOSCALE ADVANCES
(2022)
Article
Mathematics, Applied
Chiranjeev K. Shahu, Shruti Dubey
Summary: This work investigates the static and dynamic features of transverse domain walls in a magnetostrictive, linear elastic isotropic ferromagnetic material under the action of magnetic field and electric current. The effects of stresses induced by a piezoelectric actuator and Rashba spin-orbit torque caused by structural inversion asymmetry are considered. The study derives the explicit expression of key quantities such as domain wall profile, velocity, mobility, and displacement, and confirms the agreement of the analytical results with numerical simulations and experimental observations.
MATHEMATICAL METHODS IN THE APPLIED SCIENCES
(2023)
Article
Materials Science, Multidisciplinary
Bo Hu
Summary: The influence of cubic in-plane magnetic anisotropy on current-induced domain wall motion was investigated by micromagnetic simulation. The results show that the domain wall velocity is enhanced in an optimized cubic in-plane magnetic anisotropy field, and an increase in the linear loss of domain wall velocity is observed.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2022)
Article
Physics, Multidisciplinary
N. Jiang, Y. Nii, H. Arisawa, E. Saitoh, J. Ohe, Y. Onose
Summary: Chirality in a helimagnetic structure is determined by the direction of magnetic moment rotation, and this information persists even after transitioning to a high-temperature ferromagnetic phase. Study on the 2nd harmonic resistivity rho(2f) reveals insights into chirality characteristics under different magnetic states, with the chirality memory effect possibly originating from ferromagnetic domain walls.
PHYSICAL REVIEW LETTERS
(2021)
Article
Materials Science, Multidisciplinary
Sopheak Sorn, Arun Paramekanti
Summary: In this study, transport in the presence of magnetic domain walls in a lattice model of ferromagnetic type-I Weyl metals was investigated. The study revealed the effect of DW scattering, particularly a strong skew scattering at the DW near Weyl points leading to a significant additional Hall effect. The findings are potentially relevant for understanding the Hall resistivity of spin-orbit coupled ferromagnetic metals with Weyl points near the Fermi energy, such as Co3Sn2S2, Co2MnGa, and SrRuO3.
Article
Materials Science, Multidisciplinary
G. H. R. Bittencourt, D. Altbir, V. L. Carvalho-Santos
Summary: This study investigates the effects of magnetic nanowire geometry on the width of a transverse domain wall (DW). The results demonstrate that the geometry-induced effective anisotropy is responsible for the contraction or expansion of the DW width.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Candra Kurniawan, Dede Djuhana, Bambang Soegijono, Dong-Hyun Kim
Summary: Our micromagnetic simulations based on LLG equation show that the Walker Breakdown field (HWB) in CoFeB nanowire shifts with varying pulse widths, reaching a peak at 100 ps and then decreasing steeply up to 400 ps. Above 500 ps, HWB values show no significant dependence. It is observed that in wider nanowires, exchange energy dominates over demagnetization energy, and narrower pulse widths are needed to compensate for the energy required to move the domain wall.
CURRENT APPLIED PHYSICS
(2021)
Article
Engineering, Electrical & Electronic
Deng-Shiang Shiu, Chen-Fong Wei, Kao-Fan Lai, Zhi-En Gao, Yuan-Ting Li, Yee-Mou Kao, Lance Horng
Summary: We investigated the dynamic pinning probability of a vortex domain wall (VDW) in ferromagnetic wires with different widths. The results showed that as the width increased, the pinning probability decreased. Different widths led to different wall energy densities and pinning potential energy landscapes. Wide wires were more likely to exhibit complex VDW motion.
IEEE TRANSACTIONS ON MAGNETICS
(2022)
Article
Nanoscience & Nanotechnology
A. B. Shevchenko, M. Yu Barabash
Summary: The magnetic structure near the singularity center of Bloch point in a ferromagnetic cylindrical nanowire is determined. Estimates are made for the critical values of the radius at which the transition from a transverse domain wall (DW) and an asymmetric DW to a domain wall with Bloch point occurs. It is found out that a DW with Bloch point forms at radii more than 2 x 10(2) nm and 4.6 x 10(2) nm in iron and nickel nanowires, respectively. These values indicate the possibility of practical application of the predicted results in these systems.
APPLIED NANOSCIENCE
(2022)
Article
Materials Science, Multidisciplinary
V. O. Dolocan
Summary: Numerical investigation shows that controlled motion of transverse magnetic domain walls can be achieved by adjusting the pulse shape, and polarity change affects the performance of nanowires. Furthermore, modifying material parameters through alloying can decrease the depinning current, paving the way for storage or logic applications.
Article
Nanoscience & Nanotechnology
Joseph Um, Yali Zhang, Wen Zhou, Mohammad R. Zamani Kouhpanji, Cosmin Radu, Rhonda R. Franklin, Bethanie J. H. Stadler
Summary: Nanomaterials, especially magnetic nanowires, have garnered attention across various fields for their ability to identify objects based on their magnetic signatures. Ferromagnetic resonance (FMR) is the fastest measurement method and shows potential to identify multiple high-frequency signatures simultaneously. Iron, cobalt, and nickel MNW samples were fabricated and measured using an FMR-identification (FMR-ID) system, which was optimized for DC bias fields parallel to the nanowires and microwave frequencies of 20 GHz or higher. This MNW-based FMR-ID labeling system is effective for applications requiring small identification markers.
ACS APPLIED NANO MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
C. Bran, J. A. Fernandez-Roldan, J. A. Moreno, A. Fraile Rodriguez, R. P. del Real, A. Asenjo, E. Saugar, J. Marques-Marchan, H. Mohammed, M. Foerster, L. Aballe, J. Kosel, M. Vazquez, O. Chubykalo-Fesenko
Summary: This study investigates the dynamics of domain walls in cylindrical magnetic Ni nanowires with geometrical notches. Experimental results show that larger current densities induce domain wall nucleation, while smaller currents preferentially move domain walls in the antiparallel direction to the current. Thermal modeling suggests that larger current densities temporarily raise the temperature in the nanowire above the Curie temperature, resulting in the nucleation of domain walls during system cooling. Micromagnetic modeling reveals that for intermediate current densities, Bloch point domain walls with chirality parallel to the Oersted field propagate antiparallel to the current direction.
Article
Materials Science, Multidisciplinary
Wenting Huang, Christophe Gatel, Zi-An Li, Gunther Richter
Summary: Fe and Co nano-whiskers and Co platelets were synthesized without using any template or catalyst via physical vapor deposition. The synthesized whiskers exhibited single crystal structures and magnetic single domain structures, while both FCC and HCP crystal structures were found in the Co whiskers. Vortex state was observed in a high symmetry platelet.
MATERIALS & DESIGN
(2021)
Article
Materials Science, Multidisciplinary
Xiao-Ping Ma, Ming-Xuan Cai, Je-Ho Shim, Hong-Guang Piao, Dong-Hyun Kim, Dong-Eon Kim
Summary: The study investigates the reliable unidirectional switching of a magnetic vortex core driven by a continuous rotating magnetic field using a permalloy nanodisk with a nanocavity inserted in the center in combination with micromagnetic simulations. It is found that the nanocavity modulates the modes of core motion differently based on its size, reducing the threshold field amplitude required for vortex core switching for convergence mode. The confinement of the nanocavity to the core is mediated by the cavity height, and low-power-driven fast unidirectional switching is achievable by carefully choosing the value of the nanocavity height.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2021)
Article
Chemistry, Physical
Z. Wang, S. W. Fan, H. G. Piao, Z. S. Lu
Summary: 2D Mo2B is a stable metal phase with potential as an electrode material for ion batteries, and shows promise as a catalyst for hydrogen evolution.
APPLIED SURFACE SCIENCE
(2021)
Article
Materials Science, Multidisciplinary
Candra Kurniawan, Dede Djuhana, Bambang Soegijono, Dong-Hyun Kim
Summary: Our micromagnetic simulations based on LLG equation show that the Walker Breakdown field (HWB) in CoFeB nanowire shifts with varying pulse widths, reaching a peak at 100 ps and then decreasing steeply up to 400 ps. Above 500 ps, HWB values show no significant dependence. It is observed that in wider nanowires, exchange energy dominates over demagnetization energy, and narrower pulse widths are needed to compensate for the energy required to move the domain wall.
CURRENT APPLIED PHYSICS
(2021)
Article
Materials Science, Multidisciplinary
Yunxiu Zhao, Lei Liu, Xinwen Zhou, Lin Xie, Huijuan Zhang, Hong-Guang Piao, Hongyu Sun, Liqing Pan
Summary: A high-quality permalloy nanowire with good magnetic properties has been successfully prepared by optimizing the preparation scheme, providing technical support for mass production of cylindrical permalloy nanowire for spintronic devices.
MRS COMMUNICATIONS
(2021)
Article
Materials Science, Multidisciplinary
Changfeng Li, Hongguo Yang, Xiao-Ping Ma, Cheng Song, Hong-Guang Piao
Summary: The research investigates the circulation reversal of magnetic vortex in ultra-small ferromagnetic nanodots, finding that the vortex state becomes energetically more stable with the presence of a small off-centered hole. The study highlights the perfect controllability of circulation reversal using in-plane magnetic field and reveals differences in the reversal mechanism between sub-100 nm nanodisks and larger disks. Controlling and integrating magnetic elements below 100 nm is crucial for nanoscopic spintronic and magnonic devices.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Xinping Yao, Kun Sun, Yueguo Hu, Xiaotian Qiu, Minhui Ji, Xinmiao Zhang, Mengchun Pan, Junping Peng, Jiafei Hu, Weicheng Qiu, Qi Zhang, Hong-Guang Piao, Peisen Li
Summary: The capacitance anisotropy of magnetic tunnel junctions (MTJs) has been a topic of interest. This study investigates the capacitance in MgO-based MTJs and reveals the significant role of interface capacitance and its anisotropy in the tunneling magnetocapacitance (TMC) effect.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2022)
Article
Physics, Multidisciplinary
Adam B. Cahaya, Anugrah Azhar, Dede Djuhana, Muhammad Aziz Majidi
Summary: This study reveals the influence of spin mixing conductance parameter on the gyromagnetic ratio of Gd-substituted Y3Fe5O12.
Article
Materials Science, Multidisciplinary
T. L. Phan, N. T. Dang, T. V. Manh, D. N. Petrov, B. W. Lee, D. P. Kozlenko, H. Yang, C. Li, H. G. Piao, D. S. Yang
Summary: This study reveals the re-entrance of a discontinuous first-order transition in orthorhombic La0.6-xYxCa0.4MnO3 compounds, which enhances the magnetocaloric effect. The enhanced magnetocaloric effect in La0.6-xYxCa0.4MnO3 is related to a Griffiths singularity and local Jahn-Teller distortions of the perovskite structure.
CURRENT APPLIED PHYSICS
(2022)
Article
Materials Science, Multidisciplinary
Huanhuan Zhang, Hai Yu, Xue-Feng Zhang, Xiao-Xue Yang, Je-Ho Shim, Xiao-Ping Ma, Hong-Guang Piao
Summary: This paper proposes a new method to control the chirality of magnetic vortices by optimizing the structure of a nanodisk. The results show that the polarity and circulation of the vortices can be controlled simultaneously by changing the direction of the global magnetic field, and the chirality of the vortices can be determined by detecting the stray field distribution on the surface of the nanodisk.
CURRENT APPLIED PHYSICS
(2022)
Article
Electrochemistry
Yujiao Zhang, Yuqing Zhu, Xiaotong Sun, Yaxin Wang, Zhiwei Chen, Xiongfeng Huang, Hong-Guang Piao
Summary: This paper investigates the corrosion behavior of carbon steel pipes in seawater under a magnetic field. The results from finite element model and electrochemical experiment analysis demonstrate that the direction and gradient of the magnetic field significantly impact corrosion behavior of carbon steel.
JOURNAL OF APPLIED ELECTROCHEMISTRY
(2022)
Article
Materials Science, Multidisciplinary
Xu Ge, Yangyi Chen, Zaidong Li, Peng Yan, Hong-Guang Piao, Wei Luo, Shiheng Liang, Xiaofei Yang, Long You, Yue Zhang
Summary: In this study, we numerically investigated THz magnon excitation from a moving antiferromagnetic domain wall driven by a voltage-induced magnetic anisotropy energy gradient. The resonant excitation of THz magnons was observed when the frequency of domain wall precession was higher than the frequency gap of spin-wave propagation in the medium. This work provides a potential approach for developing low-power THz spintronic devices.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Haowei Huang, Huijuan Zhang, Pengfei Li, Yuebin Chen, Shuanzhu Zhao, Xiaotong Sun, Hong-Guang Piao, Xia Zhao, Yanliang Huang
Summary: This passage discusses the issue of carbon steel corrosion in marine environments and proposes an environmentally friendly corrosion protection scheme based on a magnetic field. Experimental results show that the gradient force of a magnetic field inhibits corrosion while the Lorentz force promotes corrosion. By analyzing corrosion product composition and electrochemical impedance spectrum, the mechanism of the magnetic field's effect on corrosion behavior has been revealed.
Article
Chemistry, Multidisciplinary
Aitian T. Chen, Hong-Guang Piao, Chenhui Zhang, Xiao-Ping Ma, Hanin Algaidi, Yinchang Ma, Yan Li, Dongxing Zheng, Ziqiang Qiu, Xi-Xiang Zhang
Summary: In spintronics, controlling the orientation of ordered magnetic domains is crucial for various applications. This study shows that by applying electric fields to a ferroelectric substrate, ordered magnetic strip domains in Ni films can be switched between the y- and x-axes, providing an energy-efficient approach for manipulating magnetic domains using electric fields.
MATERIALS HORIZONS
(2023)
Article
Chemistry, Physical
Ze Yan, Yunli Xu, Lei Liu, Songwang Wang, Min Liu, Hongguang Piao, Jiaohong Huang, Yingde Zhang, Lizhi Yi, Liqing Pan
Summary: In this study, Ni45-xCrxCo5Mn36.5In13.5 and Ni45Co5Mn36.5-yCryIn13.5 Heusler alloys were prepared and their magnetic properties were investigated. The results showed that the incorporation of Cr and the substitution of Mn can significantly alter the lattice structure and magnetic properties of the alloys.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)
Article
Chemistry, Multidisciplinary
Xu Yan, Yang Hongguo, Niu Huibin, Tian Hailin, Piao Hongguang, Huang Yingping, Fang Yanfen
Summary: Through modified treatment, magnetic nano-Fe3O4 adsorption materials were successfully prepared, with different modifiers impacting their properties. The introduction of hydrophobic groups resulted in excellent hydrophilicity and water dispersibility of Fe3O4 particles. Additionally, the modified Fe3O4 showed a higher adsorption capacity for cationic dye crystal violet, making it suitable for dye wastewater treatment.
CHEMICAL JOURNAL OF CHINESE UNIVERSITIES-CHINESE
(2021)