Article
Physics, Applied
Hirofumi Ekawa, Jiaqi Shen, Kentaro Toyoki, Ryoichi Nakatani, Yu Shiratsuchi
Summary: We investigate the magnetoelectric switching of perpendicular exchange bias with low coercivity by optimizing the thickness of the Ir spacer layer in a Pt/Co/Ir/Cr2O3/Pt epitaxial film. The main impact of the Ir spacer layer is the significant reduction of coercivity, while maintaining both the perpendicular magnetic anisotropy and the perpendicular exchange bias.
APPLIED PHYSICS LETTERS
(2023)
Article
Chemistry, Physical
Jian Liang, Fengxian Wang, Qian Chen, Guangyu Wang, Xiaochao Zhou, Wei Jiang, Zhaoxia Kou, Zhaocong Huang, Qingyu Xu, Jun Du, Biao You, Ya Zhai
Summary: The interfacial effect of amorphous cobalt-iron-boron films deposited on GaAs(001) by DC magnetron-sputtering was precisely studied. It was found that in the Co60Fe20B20/GaAs heterostructure, in-plane uniaxial magnetic anisotropy is a significant magnetic property and a magnetic Schottky barrier contact has been achieved through current-voltage characteristics at the interface.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Physics, Multidisciplinary
Chunjie Yan, Lina Chen, Kaiyuan Zhou, Liupeng Yang, Qingwei Fu, Wenqiang Wang, Wen-Cheng Yue, Like Liang, Zui Tao, Jun Du, Yong-Lei Wang, Ronghua Liu
Summary: We systematically investigated the influence of Ni and Co thickness on the properties of multilayer films and found the relationship between PMA coefficient, magnetic domain structures, and magnetization dynamics. The results of this study are of great significance for promoting the application of PMA [Co/Ni] multilayer films in spintronic and spin-orbitronic devices.
Article
Materials Science, Multidisciplinary
Bo Hu, Wei He, Zhao-hua Cheng
Summary: The study investigated the dynamic magnetization and magnetic anisotropy of the Cu/bcc-Co/CoSi2/Si(001) system using Magneto-Optical Kerr Effect (MOKE) analysis and vector network analyzer ferromagnetic resonance (VNA-FMR). It observed typical fourfold magnetocrystalline anisotropy of the bcc Co film and superposed uniaxial magnetic anisotropy. The large magnetocrystalline anisotropy resulted in a high resonance frequency even in the zero applied field. The Gilbert damping parameter alpha obtained through analysis of the dynamic process was close to the theoretically estimated value of bcc phase Co, indicating the potential for enhancing the Co damping parameter using the bcc structure for high-speed magnetoelectronic devices.
MATERIALS SCIENCE AND ENGINEERING B-ADVANCED FUNCTIONAL SOLID-STATE MATERIALS
(2022)
Article
Chemistry, Physical
Xiaoyan Zhu, Yang Li, Yali Xie, Qian Qiu, Cuimei Cao, Xiao Hu, Wenhui Xie, Tian Shang, Yang Xu, Lin Sun, Wenjuan Cheng, Dongmei Jiang, Qingfeng Zhan
Summary: We quantitatively investigated the magnetocrystalline anisotropy of metamagnetic FeRh films epitaxially grown on MgO(001) substrates. We observed that the in-plane fourfold magnetic anisotropy of epitaxial FeRh films is reoriented and enhanced when FeRh undergoes a phase transition from ferromagnetic to antiferromagnetic states. The observed anisotropy is attributed to the exchange coupling between the residual ferromagnetic moments caused by antisite defects and the antiferromagnetic matrix. Furthermore, our first-principles calculations suggest that the lattice compressive strain imposed by the MgO substrate is crucial in determining the magnetic structure of FeRh films.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Multidisciplinary Sciences
Y. Hsiao, D. B. Gopman, K. Mohanchandra, P. Shirazi, C. S. Lynch
Summary: Uniform magnetic behavior within arrays of magnetoelectric heterostructures is crucial for strain-mediated microdevices. However, nonuniform magnetization reversal occurs due to various factors including surface roughness, strain non-uniformity, and fabrication-induced imperfections. In this study, Co/Ni microdisks were grown on PMN-30PT and Si substrates, and the out-of-plane magnetization reversal was characterized. The results showed that the coercivity variation across the microdisks was observed on both substrates, and the surface roughness effect led to relatively larger coercivity on PMN-30PT.
SCIENTIFIC REPORTS
(2022)
Article
Chemistry, Multidisciplinary
Aymen Fassatoui, Laurent Ranno, Jose PenaGarcia, Cristina Balan, Jan Vogel, Helene Bea, Stefania Pizzini
Summary: This study demonstrates the tuning of interfacial perpendicular magnetic anisotropy (PMA) in Pt/Co/oxide stacks by modifying the oxidation of the cobalt layer through the migration of oxygen ions, allowing for reversible switching of the easy magnetization axis. The ion drift velocity, which limits the switching time between different magnetic states, is exponentially dependent on the gate voltage and can be varied by over five orders of magnitude. Modeling the variation of PMA and Co oxidation rate during the application of the gate voltage provides insight into the design of materials with optimized properties.
Article
Materials Science, Multidisciplinary
L. Cabral, W. A. A. Macedo, E. Z. da Silva
Summary: Magnetic heterostructures with ferromagnetic/nonmagnetic interfaces are of great research and application value, and can be used to design new spintronic devices by tuning the spin-orbit coupling.
Article
Materials Science, Multidisciplinary
P. S. Alekseev, M. O. Nestoklon
Summary: In this study, it was found that the charge density of 2D electrons can significantly affect the Dresselhaus interaction in symmetric quantum wells. By internal electric field renormalization, this effect may play an important role in quantitative studies of spin-dependent phenomena in quantum wells.
Article
Chemistry, Physical
Movaffaq Kateb, Jon Tomas Gudmundsson, Snorri Ingvarsson
Summary: We optimized [(15 angstrom) Ni80Fe20/(5 angstrom) M]20 single crystal multilayers on (001) MgO substrates, and found that cube on cube epitaxial relationship can be achieved at a substrate temperature of 100 degrees C. Poly-crystalline multilayers were obtained at lower substrate temperatures, while {111} planes appeared at higher substrate temperatures. We also observed that higher epitaxial strain led to a rotation of the easy magnetization axis and increased coercivity values.
SURFACES AND INTERFACES
(2023)
Article
Materials Science, Multidisciplinary
C. H. Verbeno, J. Zazvorka, L. Nowak, M. Veis
Summary: The coercive field of magnetron sputtered Co/Pt multilayers can be adjusted by changing the thickness of the Au underlayer. The interface roughness of the layers can be controlled through the island-like growth mechanism of the Au underlayer. By varying the thickness of the Au layer, the coercive field can be changed from 200 Oe to 1100 Oe while maintaining a nearly constant saturation magnetization.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2023)
Article
Physics, Applied
Wentao Hua, Lu Lu, Lvkang Shen, Jing Jin, He Wang, Ming Liu, Chunrui Ma, Chun-Lin Jia
Summary: Research has shown that flexible epitaxial LCMO thin films fabricated on SrTiO3-buffered fluorophlogopite substrates exhibit a metal-to-insulator transition tendency towards lower temperature when subjected to mechanical bending. The transport behavior of the bent LCMO films follows the variable range hopping model in the insulating region, with resistivity increasing as bending curvature radii decrease, making them promising for use as low-temperature mechanical-bending switch devices.
APPLIED PHYSICS LETTERS
(2021)
Article
Physics, Applied
Bin Li, Runnan Zhang, Liang Zhou, Linjing Wang, Zijun Yan, Hongtao He, Gan Wang
Summary: A delicate superlattice structure of Cr2Te3/Bi-2/Bi2Te3 has been constructed based on the chemical reduction at the interface. The growth was conducted by molecular beam epitaxy, and the structural characterizations have provided solid evidence of the designed structure. The interfaces between Cr2Te3, Bi-2, and Bi2Te3 are sharp, and ferromagnetism has been introduced in this system as revealed by the negative magnetoresistance curve and the anomalous Hall effect.
APPLIED PHYSICS LETTERS
(2022)
Article
Multidisciplinary Sciences
Young Chan Won, Sang Ho Lim
Summary: The magnetic and interface properties of [Pt/Co/Pt] were studied, revealing different magnetic properties of the Co layer parts and the influence of the top Pt layer on the magnetic properties of the Co layer. Magnetometry was demonstrated as an effective tool for understanding the interface quality of magnetic multilayer systems.
SCIENTIFIC REPORTS
(2021)
Article
Physics, Multidisciplinary
Felix Friedrich, Artem Odobesko, Juba Bouaziz, Samir Lounis, Matthias Bode
Summary: Experimental evidence for the existence of spinaronic states in a hybrid system consisting of Co atoms on a Cu(111) surface has been presented. This finding provides a foundation for studying the characteristics and applications of these intriguing many-body states in artificial nanostructures.
Article
Chemistry, Multidisciplinary
Qianchi Feng, Dongshan Wei, Yudan Su, Zhiguang Zhou, Feng Wang, Chuanshan Tian
Summary: The study reveals the significant impact of out-of-plane coupling on thermal properties of graphene, as well as the reduction of density of states for longer wavelength out-of-plane vibrations when graphene is supported on an alkane substrate. The negative thermal expansion coefficient of freestanding graphene decreases when out-of-plane rippling is suppressed.
Article
Optics
Sheng Zhang, Zongyuan Fu, Bingbing Zhu, Guangyu Fan, Yudong Chen, Shunjia Wang, Yaxin Liu, Andrius Baltuska, Cheng Jin, Chuanshan Tian, Zhensheng Tao
Summary: This study introduces the generation of quasi-stationary solitons in periodic layered Kerr media to enhance the performance of SCG and pulse compression, showcasing single-stage SCG and compression of femtosecond pulses with high efficiency. The research also demonstrates efficient mode self-cleaning and high spatiotemporal quality of the compressed pulses.
LIGHT-SCIENCE & APPLICATIONS
(2021)
Article
Multidisciplinary Sciences
Shanshan Liu, Zihan Li, Ke Yang, Enze Zhang, Awadhesh Narayan, Xiaoqian Zhang, Jiayi Zhu, Wenqing Liu, Zhiming Liao, Masaki Kudo, Takaaki Toriyama, Yunkun Yang, Qiang Li, Linfeng Ai, Ce Huang, Jiabao Sun, Xiaojiao Guo, Wenzhong Bao, Qingsong Deng, Yanhui Chen, Lifeng Yin, Jian Shen, Xiaodong Han, Syo Matsumura, Jin Zou, Yongbing Xu, Xiaodong Xu, Hua Wu, Faxian Xiu
Summary: Researchers have successfully synthesized tunable 2D ferromagnetic materials with Curie temperature above room temperature by controlling the composition of the elements. The large-scale fabrication of these materials has been achieved, and magnetic tunneling junction device arrays have been fabricated.
NATIONAL SCIENCE REVIEW
(2022)
Article
Physics, Applied
Chang Niu, Yuansheng Zhao, Wenjie Hu, Qian Shi, Tian Miao, Yang Yu, Lifeng Yin, Jiang Xiao, Hangwen Guo, Jian Shen
Summary: The experimental implementation of width-tunable neurons for training a binary neural network was successful, utilizing the angle-dependent magnetic behavior in an oxide thin film to mimic neurons with width-controllable activation window. This approach achieved a high accuracy of 97.4% when applied to training the MNIST dataset, demonstrating a viable strategy for training neural networks.
APPLIED PHYSICS LETTERS
(2021)
Article
Chemistry, Physical
Changhao Xu, Yu Zhang, Qianchi Feng, Rongda Liang, Chuanshan Tian
Summary: A novel CARS scheme has been developed in this study, which allows probing buried interfaces with >= 105-fold suppression of nonresonant and resonant background. This method utilizes self-destructive interference and enables the resolution of vibrational spectra of submonolayer interfacial species.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
Article
Optics
Bingbing Zhu, Zongyuan Fu, Yudong Chen, Sainan Peng, Cheng Jin, Guangyu Fan, Sheng Zhang, Shunjia Wang, Hao Ru, Chuanshan Tian, Yihua Wang, Henry Kapteyn, Margaret Murnane, Zhensheng Tao
Summary: This study demonstrates the successful compression of 170 fs pulses from a Yb femtosecond laser to 9.2 fs using all-solid-state free-space compressors. The compression is achieved by ensuring the nonlinear beam propagation occurs in spatial soliton modes and confining the nonlinear phase within a low range. The method shows high efficiency for few-cycle compression and can be applied under various laser conditions, with the high-quality and stability of the compressed pulses verified by high-harmonic generation.
Article
Instruments & Instrumentation
Haiming Huang, Mingming Shuai, Yulong Yang, Rui Song, Yanghui Liao, Lifeng Yin, Jian Shen
Summary: This paper presents a cryogen-free system with SP-STM and MExFM capabilities for investigating spin structures at the atomic scale. The specially designed vibration isolation system allows for extremely low noise levels.
REVIEW OF SCIENTIFIC INSTRUMENTS
(2022)
Article
Physics, Multidisciplinary
Yu Bai, Zhe Wang, Na Lei, Wisal Muhammad, Lifeng Xiang, Qiang Li, Huilin Lai, Yinyan Zhu, Wenbing Wang, Hangwen Guo, Lifeng Yin, Ruqian Wu, Jian Shen
Summary: This study reports a significantly enhanced anomalous Hall effect (AHE) of Pt on an antiferromagnetic insulator thin film (LSMO) compared to other insulator thin films. The antiferromagnetic LSMO suppresses the positive AHE induced by the magnetic proximity effect and promotes the negative AHE induced by the spin Hall effect. The AHE can be further enhanced by changing the temperature and allowing Mn atoms to diffuse into the Pt layer.
CHINESE PHYSICS LETTERS
(2022)
Article
Multidisciplinary Sciences
Qiang Li, Tian Miao, Huimin Zhang, Weiyan Lin, Wenhao He, Yang Zhong, Lifen Xiang, Lina Deng, Biying Ye, Qian Shi, Yinyan Zhu, Hangwen Guo, Wenbin Wang, Changlin Zheng, Lifeng Yin, Xiaodong Zhou, Hongjun Xiang, Jian Shen
Summary: In strongly correlated materials, electronic phase separation can occur simultaneously in real space, and the ability to control this separation is crucial for designing devices with multiple electronic properties. Li et al studied the electronic phase separation in LaMnO3/CaMnO3/PrMnO3 superlattice and discovered a nano-network electronic phase separation resulting from local strain relaxation, which persisted through thermal cycling.
NATURE COMMUNICATIONS
(2022)
Article
Chemistry, Multidisciplinary
Shunjia Wang, Wentao Qin, Sheng Zhang, Yuchen Lou, Changqin Liu, Tong Wu, Qiong He, Chuanshan Tian, Lei Zhou, Yizheng Wu, Zhensheng Tao
Summary: In this work, the authors demonstrate the realization of multifunctional spintronic-metasurface emitters, which allow simultaneous beam-steering and full polarization control of terahertz waves. The nanoengineered metasurface enables flexible control over the terahertz beam's spatial distribution and polarization states, offering a solution to the challenges associated with the growing variety of terahertz technology applications.
Article
Optics
Jiaming Le, Yudan Su, Chuanshan Tian, A. H. Kung, Y. Ron Shen
Summary: This paper describes a novel method of generating THz pulses based on Raman-resonance-enhanced four-wave mixing in centrosymmetric media, particularly diamond. The generated pulses had stable and controllable carrier-envelop phase, few-cycle duration, near-Gaussian spatial and temporal profiles, and tunable carrier frequency. The method also has the potential of improving the THz output energy to a much higher level.
LIGHT-SCIENCE & APPLICATIONS
(2023)
Review
Optics
Ying Xu, Weiye Zhang, Chuanshan Tian
Summary: This review discusses the use of negatively charged nitrogen-vacancy (NV-) centers in diamond as quantum sensors to explore condensed matter physics, with a focus on anti/ferromagnetic materials, superconductors, and metals/semimetals/semiconductors.
PHOTONICS RESEARCH
(2023)
Article
Materials Science, Multidisciplinary
Fengliang Liu, Yiqing Hao, Jinyang Ni, Yongsheng Zhao, Dongzhou Zhang, Gilberto Fabbris, Daniel Haskel, Shaobo Cheng, Xiaoshan Xu, Lifeng Yin, Hongjun Xiang, Jun Zhao, Xujie Lu, Wenbin Wang, Jian Shen, Wenge Yang
Summary: Hexagonal LuFe2O4 exhibits various charge-ordered phases with different magnetic orders under external pressure. The redistribution of charge density induced by pressure in the frustrated double-layer [Fe2O4] cluster is responsible for the correlated spin-charge phase transitions. Enhanced Coulomb interactions among Fe-Fe bonds drive the frustrated charge order into a less frustrated charge order, leading to the transition from ferrimagnetism to antiferromagnetism. This study not only elucidates the coupling mechanism among charge, spin, and lattice degrees of freedom in LuFe2O4, but also provides a new approach for tuning spin-charge orders.
NPJ QUANTUM MATERIALS
(2023)
Article
Physics, Applied
Yuxuan Wei, Jiaming Le, Li Huang, Chuanshan Tian
Summary: This work presents a convenient approach to generate strong broadband terahertz (THz) pulses with a tunable center frequency using low-cost crystalline quartz. The THz conversion efficiency in quartz reaches 0.05%, comparable to LiNbO3 at room temperature, while providing a much broader THz spectral range. This not only addresses the urgent need for a light source in nonlinear THz spectroscopy beyond 2 THz but also offers an alternative route in selecting nonlinear optical crystals for frequency conversion.
APPLIED PHYSICS LETTERS
(2023)
Article
Multidisciplinary Sciences
Ying Xu, You-Bo Ma, Feng Gu, Shan-Shan Yang, Chuan-Shan Tian
Summary: Graphitic electrode is widely used in electrochemical reactions due to its excellent in-plane conductivity, structural robustness and cost efficiency. Graphene, as a two-dimensional building block of graphite, shares similar chemical properties with graphite and offers more possibilities for developing advanced graphitic devices. This study demonstrates the minimal influence of extrinsic factors on the structural evolution at the graphene-water interface by using large-size suspended substrate-free monolayer graphene. The findings provide insights into the microscopic processes at graphitic-electrode interfaces.
