Article
Materials Science, Multidisciplinary
Shuvankar Gupta, Sudip Chakraborty, Vidha Bhasin, Santanu Pakhira, Shovan Dan, Celine Barreteau, Jean -Claude Crivello, S. N. Jha, Maxim Avdeev, Jean-Marc Greneche, D. Bhattacharyya, Eric Alleno, Chandan Mazumdar
Summary: In this paper, the successful synthesis and properties of a Fe-based highly spin-polarized quaternary Heusler alloy FeMnVGa are reported. Experimental and theoretical investigations reveal its high spin polarization (89.9%) and robustness of half-metallic ferromagnetic property in the presence of atomic disorder. The compound demonstrates great potential for spintronics applications.
Article
Multidisciplinary Sciences
Masakazu Matsubara, Takatsugu Kobayashi, Hikaru Watanabe, Youichi Yanase, Satoshi Iwata, Takeshi Kato
Summary: The magnetic metamaterial introduced in this study generates photo-driven ultrafast spin currents at room temperature and can be directed and adjusted in magnitude by tuning the polarization of the incident light.
NATURE COMMUNICATIONS
(2022)
Article
Materials Science, Multidisciplinary
Deepti Rana, Monika Bhakar, G. Basavaraja, Satyabrata Bera, Neeraj Saini, Suman Kalyan Pradhan, Mintu Mondal, Mukul Kabir, Goutam Sheet
Summary: The size reduction of power saving electronic devices can be achieved by utilizing the spin degree of freedom of conduction electrons in van der Waals spintronic architectures built with 2D materials. The Fe4GeTe2 family of ferromagnets, with near-room temperature ferromagnetism and good metallicity, have shown potential for application in all-vdW power-saving spintronic devices. Spin-resolved Andreev reflection spectroscopy on Fe4GeTe2 has demonstrated its ability to generate a highly spin-polarized electronic transport current, making it a strong candidate for such devices.
Article
Multidisciplinary Sciences
Hiroki Arisawa, Hang Shim, Shunsuke Daimon, Takashi Kikkawa, Yasuyuki Oikawa, Saburo Takahashi, Takahito Ono, Eiji Saitoh
Summary: The authors report the manipulation of the thickness of thin films of ferromagnetic material by spin current, demonstrating the spin current volume effect (SVE). Theoretical calculations and experimental results show that injecting a spin current using Tb0.3Dy0.7Fe2 can change the sample volume, expanding the application of spintronics into mechanical devices.
NATURE COMMUNICATIONS
(2022)
Article
Materials Science, Multidisciplinary
Ge-Hui Zhu, Ying-Li Wu, Jia-Liang Wan, Xiao-Qin Yu
Summary: A new mechanism to generate the unidirectional Seebeck effect (USE) in the absence of magnetism or magnetic order has been discovered in the Rashba two dimensional electron gas (2DEG). The USE has a quantum origin from the spin-momentum locking generated by Rashba spin-orbit coupling. It exhibits a sine dependence on the orientation of the magnetic field with respect to the temperature gradient direction and is dominant above the Lifshitz point.
Article
Physics, Multidisciplinary
Dongwook Go, Daegeun Jo, Kyoung-Whan Kim, Soogil Lee, Min-Gu Kang, Byong-Guk Park, Stefan Bluegel, Hyun-Woo Lee, Yuriy Mokrousov
Summary: Contrary to the common assumption, the orbital response in ferromagnets can exhibit remarkable long-ranged behavior, even in the presence of strong crystal field potential and orbital quenching. By studying a bilayer structure composed of a nonmagnet and a ferromagnet, it is found that induced orbital angular momentum can extend far beyond the spin dephasing length, even when an external electric field is applied only on the nonmagnet. This behavior is attributed to nearly degenerate orbital characters imposed by crystal symmetry, which form hotspots for the intrinsic orbital response. The findings suggest the potential use of long-range orbital response in orbitronic device applications.
PHYSICAL REVIEW LETTERS
(2023)
Article
Chemistry, Physical
Xingchi Mu, Yiming Pan, Jian Zhou
Summary: We have elucidated a bias-free light-induced orbital and spin current through nonlinear response theory, and demonstrated this effect in two-dimensional nonmagnetic ferroelectric materials. This hidden photo-induced pure orbital current could lead to a pure spin current via spin-orbit coupling interactions, offering a route to generalizing nanoscale devices into orbitronics and spintronics.
NPJ COMPUTATIONAL MATERIALS
(2021)
Article
Physics, Applied
Sajid Husain, Nicholas Figueiredo-Prestes, Olivier Fayet, Sophie Collin, Florian Godel, Eric Jacquet, Nicolas Reyren, Henri Jaffres, Jean-Marie George
Summary: Ferrimagnetic insulators (FIMIs) are promising materials for spin-orbit torque (SOT) devices due to their ability to propagate a spin current without Ohmic losses. The origin of the anomalous Hall effect (AHE) in FIMI/heavy metal (HM) systems has remained unclear. In this study, we demonstrate that the AHE and spin Hall magnetoresistance (SMR) in FIMI/HM bilayer heterostructures have the same origin.
APPLIED PHYSICS LETTERS
(2023)
Article
Materials Science, Multidisciplinary
J. Qu, X. Han, S. Sakamoto, C. J. Jia, J. Liu, H. Li, D. Guan, Y. -J. Zeng, M. Schuler, P. S. Kirchmann, B. Moritz, Z. Hussain, T. P. Devereaux, Z. -X Shen, J. A. Sobota
Summary: Spin-orbit coupling is the foundation for quantum materials with non-trivial topology and potential spintronics applications. The Rashba interaction is a representative model of spin-orbit interactions, and BiTeX (X = Cl, Br, I) semiconductors have been identified as exemplary Rashba materials. However, a detailed investigation of their spin textures and their relationship to local crystal symmetry is currently lacking. In this study, we directly image the spin texture of surface states of BiTeCl and find deviations from ideal behavior, including spin-polarization reversal near the Fermi level. These effects are described by higher-order contributions to the canonical Rashba model.
NPJ QUANTUM MATERIALS
(2023)
Article
Physics, Multidisciplinary
Hiroki Hayashi, Daegeun Jo, Dongwook Go, Tenghua Gao, Satoshi Haku, Yuriy Mokrousov, Hyun-Woo Lee, Kazuya Ando
Summary: Modern spintronics relies on the generation of spin currents through spin-orbit coupling. The spin-current generation has been believed to be triggered by current-induced orbital dynamics, which governs the angular momentum transfer from the lattice to the electrons in solids. The fundamental role of the orbital response in the angular momentum dynamics suggests the importance of the orbital counterpart of spin currents: orbital currents. Here, we demonstrate the generation of giant orbital currents and uncover fundamental features of the orbital response.
COMMUNICATIONS PHYSICS
(2023)
Article
Chemistry, Multidisciplinary
Soumyasree Jena, Sanjoy Datta
Summary: In this study, the electronic properties and thermodynamic stability of tetragonal BiFeO3(001) surfaces were investigated using first-principles calculations. Evidence of half-metallicity and spin-polarized two-dimensional hole gas (2DHG) was found at the surface of the most stable structure. The surface electronic properties and thermodynamic stability were found to be sensitive to the nature of surface termination, with the FeO2-terminated surface being more stable and exhibiting half-metallic states, while the BiO-terminated surface was metallic.
NEW JOURNAL OF CHEMISTRY
(2023)
Review
Nanoscience & Nanotechnology
Evangelos Th Papaioannou, Rene Beigang
Summary: THz spintronics is a research direction that combines magnetism, optical physics, and ultrafast photonics. The experimental scheme involves using femtosecond laser pulses to trigger spin and charge dynamics in thin films. Key challenges include increasing intensity, shaping frequency bandwidth, and controlling the transport of ultrafast spin current for radiation source control.
Article
Physics, Applied
M. A. Rakitskii, K. S. Denisov, I. Rozhansky, N. S. Averkiev
Summary: This paper theoretically explores the impact of electron skew scattering on Hall current in non-magnetic systems caused by paramagnetic impurities, proposing a method to distinguish this effect by detecting specific terms in the Hall voltage that are independent of spin polarization.
APPLIED PHYSICS LETTERS
(2021)
Article
Chemistry, Physical
Yun Ni, Jia Li, Wei Tao, Hao Ding, Rui-Xue Li
Summary: This paper studied the transport properties of defected ZGNR with a graphene nanobubble through first-principles quantum transport calculations. When the nanobubble is intact and located at the center, the spin polarization and magnetoresistance tend to decrease at low bias voltages, while when the nanobubble is split and located at the edge, all transport properties are significantly affected and altered. New results obtained from the device include the negative differential resistance effect and the pure thermal-induced spin-current.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2021)
Article
Materials Science, Multidisciplinary
Qiang Li, Haiyang Ma, Xin Zhang, Yanfeng Guo, Jianpeng Liu, Wenbo Wang, Xiaodong Zhou, Jian Shen
Summary: This study explores the possibility of electrically manipulating domain wall (DW) using the DW bound states in magnetic Weyl semimetal EuB6. By combining magnetic force microscopy (MFM) and first-principles calculations, it is found that domains with magnetization aligned along the [100] directions dominate under a certain magnetic field. The calculated DW bound state shows a spectral distribution over a large portion of the DW Brillouin zone. The localized charges generated by these DW bound states can be used to drive DW motion through electrostatic forces.
