Article
Physics, Multidisciplinary
Jin Cao, Wei Jiang, Xiao-Ping Li, Daifeng Tu, Jiadong Zhou, Jianhui Zhou, Yugui Yao
Summary: An unconventional anomalous Hall effect (IPAHE) induced by an in-plane magnetic field is discovered in PT-symmetric antiferromagnetic systems. This effect is demonstrated in known AFM materials and a new kind of AFM heterodimensional superlattice, showing potential for applications in AFM spintronic devices. Experimental detection methods are briefly discussed.
PHYSICAL REVIEW LETTERS
(2023)
Article
Materials Science, Multidisciplinary
T. Nathan Nunley, Side Guo, Liang-Juan Chang, David Lujan, Jeongheon Choe, Shang-Fan Lee, Fengyuan Yang, Xiaoqin Li
Summary: Recent research has found that thulium iron garnet (TmIG) based bilayers show promise in realizing small skyrmions at room temperature. By directly measuring the magnetic hysteresis loops, researchers have determined that the spin Hall topological Hall resistivity is considerably larger than previously estimated values. This finding further confirms the existence of skyrmions at room temperature and near-zero applied magnetic fields.
Article
Chemistry, Multidisciplinary
Zhaoyu Yao, Yuliang Yuan, Tao Cheng, Lei Gao, Tulai Sun, Yangfan Lu, Yi-Ge Zhou, Pedro L. Galindo, Zhilong Yang, Liang Xu, Hao Yang, Hongwen Huang
Summary: A study discovered an anomalous size effect of Pt nanowires, where the activity and durability of oxygen reduction reaction increased as the diameter decreased from 2.4 to 1.1 nm. This was attributed to increased compressive strain weakening adsorption and suppressing Pt dissolution, as well as the reduced low-coordinated sites and intrinsic structural advantage on the nanowires.
Article
Chemistry, Multidisciplinary
Peixin Qin, Han Yan, Benshu Fan, Zexin Feng, Xiaorong Zhou, Xiaoning Wang, Hongyu Chen, Ziang Meng, Wenhui Duan, Peizhe Tang, Zhiqi Liu
Summary: This study demonstrates the modulation of carrier density in an ultrathin noncollinear antiferromagnetic film, leading to the complete shutdown of the anomalous Hall effect.
ADVANCED MATERIALS
(2022)
Article
Quantum Science & Technology
Utkarsh Shashank, Rohit Medwal, Taiga Shibata, Razia Nongjai, Joseph Vimal Vas, Martial Duchamp, Kandasami Asokan, Rajdeep Singh Rawat, Hironori Asada, Surbhi Gupta, Yasuhiro Fukuma
Summary: Efficient charge-spin interconversion is crucial for understanding the functionalities of spin-orbit torque in energy-efficient and high-speed spintronic devices. A new spin Hall material, Pt(S), is reported in this study, demonstrating significantly higher conversion efficiency compared to pristine Pt, along with large spin Hall angle and viable electrical and spin Hall conductivity.
ADVANCED QUANTUM TECHNOLOGIES
(2021)
Article
Chemistry, Multidisciplinary
Hee Taek Yi, Deepti Jain, Xiong Yao, Seongshik Oh
Summary: Researchers have developed a platform that overcomes limitations of the quantum anomalous Hall effect (QAHE), enabling observation at higher temperatures without the need for electric-field-effect gating. By introducing a CrO x capping layer, the material's properties are improved, allowing for broader applications of QAHE.
Article
Physics, Multidisciplinary
Da Ma, Arpit Arora, Giovanni Vignale, Justin C. W. Song
Summary: Berry curvature and skew scattering are important for the anomalous Hall effect in antiferromagnetic metals. In PT-symmetric antiferromagnetic metals, the Hall effects individually vanish. However, we reveal a new nonlinear Hall effect (ASN) that relies on both Berry curvature and skew scattering working together. This ASN produces helicity dependent photocurrents, which can be used to investigate the antiferromagnetic order in PT-symmetric metals.
PHYSICAL REVIEW LETTERS
(2023)
Article
Physics, Applied
Xuegang Chen, Qiuchen Wu, Le Zhang, Yifei Hao, Myung-Geun Han, Yimei Zhu, Xia Hong
Summary: In this study, we investigate the unconventional magnetotransport properties of NiCo2O4 thin films. The results show that even at ultrathin film thickness, NiCo2O4 films still exhibit strong perpendicular magnetic anisotropy, which is crucial for nanoscale spintronic applications. The changes in magnetotransport properties can be attributed to the competing effects between impurity scattering and band intrinsic Berry curvature.
APPLIED PHYSICS LETTERS
(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
Physics, Multidisciplinary
V. K. Kozin, V. A. Shabashov, A. Kavokin, I. A. Shelykh
Summary: This study reveals that even in the absence of external electric fields, electrically neutral excitons can be influenced by crossed electric and magnetic fields, changing the direction of their propagation. The anomalous exciton Hall effect proposed in this research can be used for spatial separation of dark and bright excitons.
PHYSICAL REVIEW LETTERS
(2021)
Article
Materials Science, Multidisciplinary
M. D. E. Denys, P. M. R. Brydon
Summary: By utilizing the Kubo formalism, we derived an analytical expression for the high-frequency ac Hall conductivity, involving two distinct gauge-invariant time-reversal-odd bilinear functions related to the pairing potential and its Hermitian conjugate. The existence of at least one of these functions typically implies a nonzero ac Hall conductivity. These functions help clarify the roles of intra- and interband pairing, and provide a simple criterion for a superconducting state to exhibit the anomalous Hall effect.
Article
Physics, Multidisciplinary
Shi-Lin Hu, Jun-Hua Liu, Zhi-Xiong Deng, Wen Xiao, Zhan Yang, Kai Chen, Zhao-Liang Liao
Summary: Many emergent and novel phenomena occur in nonmagnetic/ferromagnet heterostructures. Pt/ferromagnet heterostructures, where Pt has strong spin-orbit coupling and can convert spin current into charge current, have attracted significant attention. This study investigates the anomalous Hall resistances (AHRs) in Pt thin films sputtered on epitaxial LSMO ferromagnetic films. High-quality Pt/LSMO heterojunctions are fabricated and characterized, revealing the origin of ferromagnetism in Pt and the possible presence of a topological Hall effect.
ACTA PHYSICA SINICA
(2023)
Article
Nanoscience & Nanotechnology
Yang Cheng, Sisheng Yu, Menglin Zhu, Jinwoo Hwang, Fengyuan Yang
Summary: The study reports the observation of high-temperature topological Hall signal in Mn3Sn/Pt bilayers, likely attributed to the stabilization of topological spin textures enabled by the strong spin-orbit coupling of the Pt overlayer and the Dzyaloshinskii-Moriya interaction at the Mn3Sn/Pt interface.
Review
Physics, Multidisciplinary
Cui-Zu Chang, Chao -Xing Liu, Allan H. MacDonald
Summary: The quantum Hall effect is the characteristic experimental fingerprint of Chern insulators, which combine quantized Hall resistance with zero longitudinal resistance. Chern insulators exhibit nontrivial bulk band topology expressed by chiral states that carry current along sample edges without dissipation. The quantum anomalous Hall effect refers to the occurrence of quantum Hall effects without external magnetic fields due to spontaneously broken time-reversal symmetry. The QAH effect has been realized in four different classes of two-dimensional materials.
REVIEWS OF MODERN PHYSICS
(2023)
Editorial Material
Physics, Applied
Ankita Anirban
Summary: A paper in Physical Review B demonstrates that the layer Hall effect can be quantized in ferromagnetic and antiferromagnetic topological insulators.
NATURE REVIEWS PHYSICS
(2023)
