Article
Multidisciplinary Sciences
W. Janus, T. Slezak, M. Slezak, M. Szpytma, P. Drozdz, H. Nayyef, A. Mandziak, D. Wilgocka-Slezak, M. Zajac, M. Jugovac, T. O. Mentes, A. Locatelli, A. Koziol-Rachwal
Summary: We investigated the magnetic properties of antiferromagnetic NiO(001) thin films in the NiO/MgO(d(MgO))/Cr/MgO(001) system with different thicknesses of MgO. X-ray Magnetic Linear Dichroism results showed that the rotation of NiO spins from in-plane towards out-of-plane direction occurred with an increasing d(MgO). Furthermore, we examined the effect of Fe proximity on the magnetic state of NiO in the Fe/NiO/MgO(d(MgO))/Cr/MgO(001) system. The existence of a multidomain state in NiO was confirmed, which resulted from the competition between the ferromagnet/antiferromagnet exchange coupling and strain exerted on the NiO by the MgO buffer layer.
SCIENTIFIC REPORTS
(2023)
Article
Materials Science, Multidisciplinary
M. Yang, Q. Li, T. Wang, B. Hong, C. Klewe, Z. Li, X. Huang, P. Shafer, F. Zhang, C. Hwang, W. S. Yan, R. Ramesh, W. S. Zhao, Y. Z. Wu, Xixiang Zhang, Z. Q. Qiu
Summary: This study investigates the mechanism of current-induced switching of antiferromagnetic (AFM) order using measurements of Hall resistance and x-ray magnetic linear dichroism. The researchers identified both magnetic and nonmagnetic contributions to the current-induced changes and quantitatively determined the percentage of spin switching. They also found that the thermal effect on CoO magnetic switching varies with the film structure.
Article
Materials Science, Multidisciplinary
M. Slezak, P. Drozdz, W. Janus, M. Szpytma, H. Nayyef, A. Koziol-Rachwal, M. Zajac, T. Slezak
Summary: In this study, exchange bias and interfacial antiferromagnetic spin orientation in epitaxial CoO(111)/Fe(110) bilayers were investigated. Experimental results revealed that exchange bias occurs in the zero-field-cooled system and is influenced by the in-plane magnetic state of the Fe(110) sublayer and the uniaxial magnetic anisotropy of the Fe layer. The specific magnetic state chosen for the Fe sublayer can determine the axis and direction of interfacial antiferromagnetic spins after the sample is cooled.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2022)
Article
Chemistry, Physical
Peijiao Fang, Baiwei Wang, C. P. Mulligan, T. M. Murray, S. Khare, Daniel Gall
Summary: In this study, tungsten carbide films were sputter-deposited onto Mg0(001) substrates at 400 degrees C in Ar - CH4 gas mixtures. The films were found to contain amorphous carbon and carbon vacancies. The epitaxial relationship between the cubic WCy phase layers and the substrate was demonstrated through X-ray diffraction and transmission electron microscopy analyses.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Multidisciplinary
Jian Mao, Zhi Heng Yao, Xu Zhang, Jijun Yun, Meixia Chang, Yalu Zuo, Li Xi
Summary: This study investigated the spin-pumping and spin-orbit torque efficiencies in ferromagnetic/heavy metal bilayers, revealing the influence of different crystallographic directions on the anisotropic spin current absorption and spin-orbit torques in epitaxial Pt(111) layer. The results from ferromagnetic resonance and harmonic Hall resistance measurement techniques provided insights into the spin current transmission efficiency and anisotropic spin Hall effect of the epitaxial Pt(111) layer.
Article
Multidisciplinary Sciences
Shubhankar Das, A. Ross, X. X. Ma, S. Becker, C. Schmitt, F. van Duijn, E. F. Galindez-Ruales, F. Fuhrmann, M-A Syskaki, U. Ebels, V Baltz, A-L Barra, H. Y. Chen, G. Jakob, S. X. Cao, J. Sinova, O. Gomonay, R. Lebrun, M. Klaui
Summary: The research shows that there is a mechanism for long-distance spin transport in the antiferromagnetic orthoferrite YFeO3, with a magnon decay length exceeding hundreds of nanometers and low magnetic damping. The strong anisotropy in magnon decay lengths is attributed to the role of magnon group velocity in the transport of spin-waves.
NATURE COMMUNICATIONS
(2022)
Article
Materials Science, Multidisciplinary
M. Yang, Q. Li, A. T. N'Diaye, P. Shafer, C. Klewe, T. Y. Wang, Y. Z. Wu, Xixiang Zhang, C. Hwang, Z. Q. Qiu
Summary: Using XMCD and XMLD measurements, this study determined the spin orientations of Ni, CoO and Fe films in Ni/CoO/Fe films grown on a curved MgO(001) substrate. The results showed that the vicinal surface of the substrate caused a spin canting towards the out-of-plane direction in the Ni and CoO films due to interfacial coupling. The spin canting angle increased with the vicinal angle and this relationship was quantitatively determined. This research provides a new pathway for tailoring spin orientation in thin-film based spintronic devices by modifying the substrate surface symmetry in combination with ferromagnetic/antiferromagnetic interfacial interaction.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Bo Yang, Ivan Soldatov, Fenghua Chen, Yudong Zhang, Zongbin Li, Haile Yan, Rudolf Schaefer, Dunhui Wang, Claude Esling, Xiang Zhao, Liang Zuo
Summary: In this study, the magnetic domain and microstructure evolution of epitaxial Ni-Mn-Ga thin films were investigated using wide-field magneto-optical Kerr microscopy. The results showed that the abrupt magnetization changes in the hysteresis loops should be attributed to the magnetic domain evolution.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2022)
Article
Engineering, Electrical & Electronic
D. G. Newman, M. Dabrowski, P. S. Keatley, Q. Li, M. Yang, S. R. Marmion, B. J. Hickey, Z-Q Qiu, R. J. Hicken
Summary: The method presented in this study detects the propagation of spin current through an epitaxial antiferromagnetic NiO layer using spin pumping and the inverse spin Hall effect, with additional contributions from anisotropic magnetoresistance. Exciting the sample with out-of-plane rf magnetic field and measuring with a static field applied at different orientations allows for the identification of a signal associated with the dc spin current.
IEEE TRANSACTIONS ON MAGNETICS
(2021)
Article
Chemistry, Multidisciplinary
Chen Ye, Cong Wang, Qiong Wu, Sheng Liu, Jiayuan Zhou, Guopeng Wang, Aljoscha Soll, Zdenek Sofer, Ming Yue, Xue Liu, Mingliang Tian, Qihua Xiong, Wei Ji, Xiao Renshaw Wang
Summary: In this study, we use magnetotransport characterization and first-principles calculations to reveal the layer-dependent interlayer antiferromagnetic spin reorientation in air-stable semiconductor CrSBr. We discover an odd-even layer effect of interlayer spin reorientation and identify the competitions among different factors. A layer-dependent magnetic phase diagram is also constructed.
Article
Physics, Condensed Matter
G. R. Haripriya, T. W. Heitmann, D. K. Yadav, G. C. Kaphle, Madhav Prasad Ghimire, R. Pradheesh, J. Joshi, P. Vora, K. Sethupathi, V Sankaranarayanan, H. S. Nair
Summary: In this study, the electronic and magnetic properties of Dy(2)FeCoO(6) were investigated using various experimental techniques and theoretical calculations. Two magnetic phase transitions were found, along with details regarding the structure and magnetic moments of the material. The experimental antiferromagnetic structure was supported by DFT calculations predicting an insulating electronic state in Dy2FeCoO6.
JOURNAL OF PHYSICS-CONDENSED MATTER
(2021)
Article
Engineering, Electrical & Electronic
Xin Gui, Madalynn Marshall, Ranuri S. Dissanayaka Mudiyanselage, Ryan A. Klein, Qiang Chen, Qiang Zhang, William Shelton, Haidong Zhou, Craig M. Brown, Huibo Cao, Martha Greenblatt, Weiwei Xie
Summary: FePt5P is a substitutional variant of the anti-CeCoIn5 structure type with complex magnetic orders, showing a stripe-type antiferromagnetic order at approximately 90 K and spin reorientation at around 74 K and 68 K. The compound exhibits structural stability enhanced by strong spin-orbit coupling and s-d hybridization between P and Fe/Pt electrons.
ACS APPLIED ELECTRONIC MATERIALS
(2021)
Article
Chemistry, Physical
Xiaoxuan Ma, Wencheng Fan, Gang Zhao, Haiyang Chen, Chuankun Wang, Baojuan Kang, Zhenjie Feng, Jun-Yi Ge, Wei Ren, Shixun Cao
Summary: The magnetic behavior of a rare-earth orthoferrite ErFeO3 single crystal can be controlled by low magnetic fields, with two types of spin switching observed below the spin reorientation transition temperature. The applied magnetic fields can regulate the spin switching along the a-axis of the single crystal, while understanding the magnetic reversal effects can help explore potential applications in information devices.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)
Article
Instruments & Instrumentation
M. Slezak, H. Nayyef, P. Drozdz, W. Janus, E. Swierkosz, M. Szpytma, M. Zajac, A. Koziol-Rachwal, T. Slezak
Summary: We investigated the magnetic properties of epitaxial CoO(111)/Fe(110) and NiO(111)/Fe(110) bilayers by combining X-ray magnetic linear and circular dichroism with magnetooptic Kerr effect measurements. Our results show that in both cases, the ferromagnetic sublayer plays a dominant role and determines the magnetic state of the neighboring antiferromagnet, although different interaction scenarios are observed. In CoO/Fe bilayers, the antiferromagnetic spins are frozen and their orientation is imprinted by the magnetization of the Fe layer. On the other hand, in NiO/Fe bilayers, the antiferromagnetic spins are rotatable and always follow the reorientation of the Fe magnetization.
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS
(2023)
Article
Physics, Applied
R. V. Ovcharov, E. G. Galkina, B. A. Ivanov, R. S. Khymyn
Summary: We propose a high-frequency spin-Hall nano-oscillator based on a simple magnetic texture, which can generate a stable ac output signal and has tunable frequency. The pinning of the domain wall is crucial for the oscillator design.
PHYSICAL REVIEW APPLIED
(2022)
Article
Physics, Multidisciplinary
Jia Xu, Jing Xia, Xichao Zhang, Chao Zhou, Dong Shi, Haoran Chen, Tong Wu, Qian Li, Haifeng Ding, Yan Zhou, Yizheng Wu
Summary: We experimentally demonstrate that the switching rate of the antiferromagnetic (AFM) domain can be significantly enhanced by more than 2 orders of magnitude through applying an alternating square-wave field on a Fe/CoO bilayer. This finding opens up new opportunities for designing antiferromagnet-based spintronic devices.
PHYSICAL REVIEW LETTERS
(2022)
Article
Multidisciplinary Sciences
Gong Chen, Colin Ophus, Alberto Quintana, Heeyoung Kwon, Changyeon Won, Haifeng Ding, Yizheng Wu, Andreas K. Schmid, Kai Liu
Summary: In this study, a novel approach of using hydrogen adsorption for writing and deleting skyrmions at room temperature was demonstrated. Through Monte-Carlo simulations, it was found that hydrogen-induced magnetic anisotropy change led to the creation and annihilation of skyrmions. Additionally, the effects of hydrogen and oxygen on magnetic anisotropy and skyrmion deletion on other magnetic surfaces were also explored.
NATURE COMMUNICATIONS
(2022)
Article
Materials Science, Multidisciplinary
Hong Xia, Haoran Chen, Changyeon Won, Haibin Zhao, Yizheng Wu
Summary: In this study, we investigated the propagation and emission of spin waves (SWs) in thin film systems with strong interfacial Dzyaloshinskii-Moriya interaction (DMI) using micromagnetic simulation. We found that DMI affects the propagation of SWs in a way analogous to the spin Doppler effect caused by the flow of magnetic medium, and this effect can be enhanced or suppressed by a spin-polarized current. Furthermore, by combining the interfacial DMI and the spin-polarized current, we demonstrated a continuous emission of SWs from a static source, providing a promising approach to generate SWs with tunable frequency.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Shengru Chen, Qinghua Zhang, Dongke Rong, Yue Xu, Jinfeng Zhang, Fangfang Pei, He Bai, Yan-Xing Shang, Shan Lin, Qiao Jin, Haitao Hong, Can Wang, Wensheng Yan, Haizhong Guo, Tao Zhu, Lin Gu, Yu Gong, Qian Li, Lingfei Wang, Gang-Qin Liu, Kui-juan Jin, Er-Jia Guo
Summary: This study reports the creation of morphotropic grain boundaries in laterally interconnected cobaltite homostructures. By modulating and isolating electronic states and magnetic behavior through the grain boundaries, artificially engineered functionalities can be achieved in the planar matrix.
ADVANCED MATERIALS
(2023)
Article
Multidisciplinary Sciences
Shengru Chen, Qinghua Zhang, Xujing Li, Jiali Zhao, Shan Lin, Qiao Jin, Haitao Hong, Amanda Huon, Timothy Charlton, Qian Li, Wensheng Yan, Jiaou Wang, Chen Ge, Can Wang, Baotian Wang, Michael R. Fitzsimmons, Haizhong Guo, Lin Gu, Wen Yin, Kui-juan Jin, Er Jia Guo
Summary: In this study, a unit-thick syntactic layer of cobaltites was constructed within a strongly tilted octahedral matrix through atomically precise synthesis. The tilting patterns of the octahedral matrix propagated into the cobaltites and induced severe rumpling within neighboring layers, triggering electronic reconstruction and resulting in robust ferromagnetism. This work demonstrates a design methodology for fine-tuning lattice and spin degrees of freedom in correlated quantum heterostructures through epitaxial geometric engineering.
Article
Chemistry, Multidisciplinary
Fei Jin, Yuanming Zhu, Li Li, Zizhao Pan, Desheng Pan, Meng Gu, Qian Li, Lang Chen, Hong Wang
Summary: High-entropy strategy is used to fabricate an ultra-thin spinel ferrite film with superior saturation magnetization, low coercivity, excellent resistivity, and switchable magnetic anisotropy, which is of great significance for the development of high-density memory devices.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Physics, Applied
J. He, Z. R. Zhao, H. Xia, T. Li, E. Liang, G. Ni, J. Wang, C. X. Sheng, L. Y. Chen, Y. Z. Wu, H. B. Zhao
Summary: We investigate the modulation of interlayer exchange coupling (IEC) between ferromagnet (FM) Fe and insulating antiferromagnet (AFM) CoO and its effect on Gilbert damping using a time-resolved magneto-optical Kerr effect technique. Inserting a wedge spin conductor Ag layer at the Fe/CoO interface reveals that the precession frequency and damping of the Fe film decrease with increasing Ag thickness, reaching intrinsic values above 2 nm where IEC is eliminated. The temperature dependence of the precession frequency and damping also follows a similar trend for attenuated IEC. These findings emphasize the crucial role of exchange coupling at the FM-AFM interface in spin angular momentum transfer and suggest implications for spintronic applications.
APPLIED PHYSICS LETTERS
(2023)
Article
Chemistry, Multidisciplinary
Meng Zhao, Lei Wang, Yifan Zhao, Yujing Du, Zhexi He, Kai Chen, Zhenlin Luo, Wensheng Yan, Qian Li, Chenying Wang, Zhuangde Jiang, Ming Liu, Ziyao Zhou
Summary: Researchers propose an energy-efficient method for switching magnetization in spintronic devices using sunlight control. By inducing photoelectron-induced redistribution of the orbital and spin moment, the in-plane Rashba field is enhanced, leading to a weakened perpendicular magnetic anisotropy and magnetization switching. This sunlight control of PMA could offer an alternative way for energy-efficient magnetic recording.
Article
Physics, Applied
Hongyue Xu, Haoran Chen, Fanlong Zeng, Jia Xu, Xi Shen, Yizheng Wu
Summary: We investigated the anisotropy of Gilbert damping in Co-Fe-B(001) films and found a clear four-fold symmetry with respect to the in-plane field orientation. The maximum damping was observed for the field along Co-Fe-B(100). The anisotropic magnetoresistance (AMR) in the films showed little current-orientation dependence, indicating weak correlation with the origin of damping anisotropy. This research provides a useful way to control intrinsic damping for designing and optimizing spintronics devices based on Co-Fe-B.
PHYSICAL REVIEW APPLIED
(2023)
Article
Nanoscience & Nanotechnology
Chao Zhou, Jia Xu, Tong Wu, Yizheng Wu
Summary: Antiferromagnets, with high stability and stray-field-free property, are considered as a promising host material for the next generation of magnetic storage. However, conventional magnetometry becomes ineffective in investigating their microscopic properties due to the absence of net magnetization. In this Perspective, an overview of various antiferromagnetic domain imaging techniques is provided, with a focus on the promising optical imaging method based on the magneto-optical birefringence effect. Recent advances in imaging antiferromagnetic domains using the magneto-optical birefringence technique are highlighted.
Article
Materials Science, Multidisciplinary
Jingdong Shen, Wenxiang Jiang, Fengfeng Zhu, Guan-yong Wang, Huayao Li, Gan Zhao, Qian Li, Wensheng Yan, Wanli Yang, Yi-De Chuang, Jin-feng Jia, Dong Qian, L. Andrew Wray, Lin Miao
Summary: This study investigates the electronic structures and orbital occupancies of FeSe/STO thin films with different thicknesses. The results show that 1UC FeSe/STO exhibits a more persistent 3d6 electronic configuration compared to thicker films, and the possible mechanism and its impact on high-Tc superconductivity are discussed.
Article
Materials Science, Multidisciplinary
M. Yang, Q. Li, T. Wang, B. Hong, C. Klewe, Z. Li, X. Huang, P. Shafer, F. Zhang, C. Hwang, W. S. Yan, R. Ramesh, W. S. Zhao, Y. Z. Wu, Xixiang Zhang, Z. Q. Qiu
Summary: This study investigates the mechanism of current-induced switching of antiferromagnetic (AFM) order using measurements of Hall resistance and x-ray magnetic linear dichroism. The researchers identified both magnetic and nonmagnetic contributions to the current-induced changes and quantitatively determined the percentage of spin switching. They also found that the thermal effect on CoO magnetic switching varies with the film structure.
Article
Materials Science, Multidisciplinary
Xi Shen, Haoran Chen, Dong Shi, Hong Xia, Jia Xu, Fanlong Zeng, Yizheng Wu
Summary: The study investigates magnetization dynamics in disconnected kagome artificial spin ice (ASI) lattices using experimental and theoretical approaches. The research identifies the dynamical coupling effects and special magnon modes in different field orientations. This contributes to a better understanding of collective spin-dynamics behavior in nanomagnet systems.
Article
Materials Science, Multidisciplinary
Xingyu Shen, Yunjiao Cai, Yizheng Wu, Yi Ji
Summary: The ability to tune the spin relaxation length in mesoscopic Cu channels using ionic gating technique has been explored, showing reversibility at low temperature and room temperature. The tuning range can be gradually amplified through repeated gate voltage cycling.
Article
Materials Science, Multidisciplinary
Gang Qin, Xichao Zhang, Ruixuan Zhang, Ke Pei, Chendi Yang, Chunyang Xu, Yan Zhou, Yizheng Wu, Haifeng Du, Renchao Che
Summary: We experimentally demonstrate the reversible motion of skyrmions driven by a controlled temperature gradient in a chiral magnet FeGe. The skyrmions show directional thermal diffusion along the gradient of temperature, indicating the thermal-induced skyrmion Hall effect. Our results provide a promising way for the realization of caloritronic applications based on topological spin textures.
