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, Applied
Xiuping Zhou, Hanyu Ren, Congying Jiang, Fan Wang, Xinyan He, Zhenzhen Chen, Yang Qiu, Mingmin Zhu, Guoliang Yu, Haomiao Zhou
Summary: In this study, we demonstrate the controlled injection of domain walls (DWs) in a ferromagnetic nanostrip using spin-transfer torque (STT), enabled by modified perpendicular magnetic anisotropy (PMA) in Pt/Co. The presence of a 90-degree magnetized transition region is shown to be crucial for the injection process, with the generation frequency of DWs being reversibly controlled in the MHz to multi-GHz range. These findings highlight the feasibility of a highly tunable and direct-current-controlled transverse in-plane DW signal source, which has potential applications in compact and integrated DW circuits and oscillators.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2022)
Article
Chemistry, Multidisciplinary
Ke Pei, Shanshan Liu, Liting Yang, Enze Zhang, Ruixuan Zhang, Chendi Yang, Linfeng Ai, Zihan Li, Faxian Xiu, Renchao Che
Summary: The study investigates the behavior of magnetic domains in the high-Curie temperature two-dimensional magnetic material Fe3GeTe2 under the drive of pulses, revealing complex dynamic processes due to multiple stable states of the magnetic structure. Cluster of domain walls are found to be more stable and move more synchronously under pulse current drive, which poses a challenge in race track memory devices and reinforces the potential of two-dimensional magnetic materials in application research.
Article
Chemistry, Multidisciplinary
Joscha Detzmeier, Kevin Koeniger, Tomasz Blachowicz, Andrea Ehrmann
Summary: Micromagnetic simulations on sputtered nanoparticles with different structures at zero temperature reveal that small deviations in systems due to random anisotropy orientations in different grains can lead to significant deviations in magnetization reversal processes and hysteresis loops, as well as distinctly asymmetric, horizontally shifted hysteresis loops in purely ferromagnetic nanoparticles.
Article
Materials Science, Multidisciplinary
Zhen-wei Zhou, Xi-guang Wang, Yao-zhuang Nie, Qing-lin Xia, Guang-hua Guo
Summary: The spin-wave frequency comb generates a comb-like spectrum through the interaction between spin wave and oscillating magnetic domain wall, with the amplitude and frequency spacing controlled by tuning the domain wall oscillation. This comb can be used to design new magnonic devices and provides a new approach for low-power manipulation of spin waves compared to parametric excitation.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2021)
Article
Physics, Applied
Chenglong Hu, Lianze Ji, Rongzhi Zhao, Wenchao Chen, Xuefeng Zhang
Summary: In this study, dynamic switching of chirality in magnetic skyrmions was achieved by optimizing the spin-transfer torque (STT), coupled with a breathing mode resulting in auto-oscillation. The compensation of intrinsic magnetic damping by STT over an oscillation period was observed. The oscillation frequency could be tuned by adjusting current density, type, and material parameters, which has potential applications in designing nanoscale spin-transfer nano-oscillators.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(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
M. Al Bahri
Summary: A micromagnetic simulation was used to study the nucleation of transverse domain wall (TDW) and vortex domain wall (VDW) in different nanomagnetic devices based on their thickness, width, and temperature. The stability of TDW and VDW thermal switching in nanowires is strongly influenced by magnetic properties and device geometry. While TDW switching is stable up to 500 K, VDW switching shows higher thermal stability reaching up to 900 K, making them potential candidates for storage applications.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2022)
Article
Engineering, Electrical & Electronic
M. Al Bahri
Summary: The dynamics of the vortex domain wall (VDW) with head-to-head magnetization configuration in the stepped nanowire was investigated through micromagnetic simulation. The geometry and size of the stepped area greatly influence the stability and dynamics of VDW. Adjustment of the dimensions of the stepped area can affect the depinning current density of VDW.
IEEE TRANSACTIONS ON MAGNETICS
(2021)
Article
Materials Science, Multidisciplinary
Xuejuan Liu, Zhixiong Li, Qian Wang, Rong Ye, Peng Yan
Summary: We report on the correlated gyrotropic motion of two-dimensional skyrmion clusters in ferromagnetic nanodisks. The gyrotropic eigenmodes for multi-skyrmion systems are calculated based on the massless Thiele equation, and micromagnetic simulations are performed to verify the theoretical predictions with good agreement. By applying magnetic field pulses, we observe various gyrotropic modes and correlated breathing modes in different skyrmion systems.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Di Bao, Xinwei Dong
Summary: Through micromagnetic simulations, it was discovered that spin waves induced by collisions in nanostrips have a narrow frequency bandwidth in the range of 20 to 40 nm, which can be significantly adjusted by bias magnetic fields. This provides a valid method to excite spin waves with controllable bandwidth in nanostrips.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2021)
Article
Nanoscience & Nanotechnology
Oguz Yildirim, Riccardo Tomasello, Yaoxuan Feng, Giovanni Carlotti, Silvia Tacchi, Pegah Mirzadeh Vaghefi, Anna Giordano, Tanmay Dutta, Giovanni Finocchio, Hans J. Hug, Andrada-Oana Mandru
Summary: The development of skyrmionic devices requires tuning material parameters to stabilize and control the density of skyrmions. Recent research has shown that different types of skyrmions can be simultaneously stabilized at room temperature in heterostructures containing ferromagnets, ferrimagnets, and heavy metals, offering a new platform for encoding binary information using skyrmion types instead of their presence or absence. By adjusting the geometric and material parameters of individual layers, the energy landscape of the two skyrmion types in such heterostructures can be finely tuned.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Physics, Applied
Syuta Honda, Yoshiaki Sonobe, Simon John Greaves
Summary: Domain-wall motion type magnetic memories are expected to be the next generation of magnetic recording devices, with 3D-RM playing an important role in high integration by forming a vertical loop with nanowires, allowing domain walls to move. It is found that there is a maximum threshold current density for pushing a domain wall around a corner, particularly with wire thickness around 10 nm.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2021)
Article
Chemistry, Physical
A. Izotov, B. A. Belyaev, N. M. Boev, A. Burmitskikh, G. Skomorokhov, S. M. Zharkov, P. N. Solovev
Summary: Researchers are interested in nanocrystalline soft magnetic thin films for microwave applications, especially in high-frequency magnetization dynamics. This study investigates the effect of ferromagnetic resonance line broadening and shift in nanocrystalline permalloy films, which is influenced by the crystallite size exceeding a critical value. Micromagnetic simulation reveals a quasiperiodic magnetic structure formed by interactions between crystallites, affecting the energy transfer mechanisms within the film.
JOURNAL OF ALLOYS AND COMPOUNDS
(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
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)
