Article
Physics, Multidisciplinary
Yasen Hou, Fabrizio Nichele, Hang Chi, Alessandro Lodesani, Yingying Wu, Markus F. Ritter, Daniel Z. Haxell, Margarita Davydova, Stefan Ilic, Ourania Glezakou-Elbert, Amith Varambally, Sebastian Bergeret, Akashdeep Kamra, Liang Fu, Patrick A. Lee, Jagadeesh S. Moodera
Summary: The macroscopic coherence in superconductors allows for dissipationless supercurrents, which can have significant implications in emerging quantum technologies. By implementing unequal supercurrents in the forward and backward directions, the superconducting diode effect can be achieved, enabling unprecedented functionalities. Through experiments and theoretical modeling, we demonstrate the strong superconducting diode effect in conventional superconducting thin films, as well as its enhancement when interfacing with a ferromagnetic semiconductor.
PHYSICAL REVIEW LETTERS
(2023)
Article
Materials Science, Multidisciplinary
Hongyu Chen, Zexin Feng, Han Yan, Peixin Qin, Xiaorong Zhou, Huixin Guo, Xiaoning Wang, Haojiang Wu, Xin Zhang, Ziang Meng, Zhiqi Liu
Summary: Unexpected weak anomalous Hall effect was found in polycrystalline thin films of chromium, possibly attributed to noncollinear spin textures induced by local spin frustration and rearrangement. A dominant intrinsic Berry phase mechanism is speculated. This may be a general feature for collinear antiferromagnetic thin-film materials with moderately high defect concentrations, making them promising candidates for emergent antiferromagnetic spintronics.
Article
Physics, Applied
H. Richter, W. Lang, M. Peruzzi, H. Hattmansdorfer, J. H. Durrell, J. D. Pedarnig
Summary: Thin films of high-temperature superconductor HgBa2CaCu2O6 were prepared on SrTiO3 substrates by pulsed-laser deposition and annealing in a mercury-vapor atmosphere. The microstructural properties were analyzed by X-ray analysis and atomic force microscopy, showing similar superconducting properties despite morphological variations. Hall measurements provided estimates of carrier scattering defects and vortex pinning properties inside the grains in the superconducting state.
SUPERCONDUCTOR SCIENCE & TECHNOLOGY
(2021)
Article
Chemistry, Multidisciplinary
Yequan Chen, Yingmei Zhu, Renju Lin, Wei Niu, Ruxin Liu, Wenzhuo Zhuang, Xu Zhang, Jinghua Liang, Wenxuan Sun, Zhongqiang Chen, Yongsheng Hu, Fengqi Song, Jian Zhou, Di Wu, Binghui Ge, Hongxin Yang, Rong Zhang, Xuefeng Wang
Summary: This study demonstrates a significant topological Hall effect (THE) in large-area ferromagnetic Cr5Te6 thin films, which is essential for exploring the spin chirality generated by the real-space Berry curvature. The observed THE reaches approximately 1.6 μΩcm and can be maintained up to 270 K, thanks to the field-stimulated noncoplanar spin textures induced by the interaction of in-plane ferromagnet and antiferromagnet infrastructures. First-principles calculations further confirm the considerable Dzyaloshinskii-Moriya interaction in Cr5Te6. This work not only paves the way for robust chiral spin textures near room temperature in large-area low-dimensional ferromagnetic films for practical applications but also facilitates the development of high-density and dissipationless spintronic devices.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Takumi Yamazaki, Takeshi Seki, Rajkumar Modak, Keita Nakagawara, Takamasa Hirai, Keita Ito, Ken-ichi Uchida, Koki Takanashi
Summary: In this study, we investigated the dependence of the anomalous Hall effect (AHE) and anomalous Nernst effect (ANE) on the thickness of the Ni-Fe layer. The AHE showed a sign change at a thickness of 9 nm, while the ANE remained almost constant regardless of thickness. Further analysis revealed that the ANE was primarily influenced by the transverse thermoelectric conductivity, while the contribution of the AHE could be neglected. The sign reversal in the AHE was attributed to the competing contributions of extrinsic and intrinsic mechanisms.
Article
Chemistry, Multidisciplinary
Kacho Imtiyaz Ali Khan, Ram Singh Yadav, Himanshu Bangar, Akash Kumar, Niru Chowdhury, Prasanta Kumar Muduli, Pranaba Kishor Muduli
Summary: In this study, we investigate the growth of Fe3Sn2 thin films on Si/SiO2 substrates with two different seed layers (Ta and Pt). We find that Pt/Fe3Sn2 thin films form a pure ferromagnetic phase with higher saturation magnetization and exhibit an anomalous Hall coefficient that is two orders of magnitude higher than traditional ferromagnets. These results are important for the development of novel topological spintronic devices.
Article
Chemistry, Multidisciplinary
Yi-Fan Zhao, Ling-Jie Zhou, Fei Wang, Guang Wang, Tiancheng Song, Dmitry Ovchinnikov, Hemian Yi, Ruobing Mei, Ke Wang, Moses H. W. Chan, Chao-Xing Liu, Xiaodong Xu, Cui-Zu Chang
Summary: The study utilized molecular beam epitaxy (MBE) to grow MnBi2Te4 films of various thicknesses and observed a nonsquare hysteresis loop in films with a thickness greater than 2 septuple layers (SL). The hysteresis loop was found to consist of two anomalous Hall (AH) components, one from the dominant MnBi2Te4 phase and the other from the minor Mn-doped Bi2Te3 phase. The AH component extracted from the MnBi2Te4 phase exhibited clear even-odd layer-dependent behavior.
Article
Chemistry, Physical
Yongcheng Deng, Runze Li, Xionghua Liu
Summary: Research shows that even thin Mn3Sn films as thin as 20 nm exhibit a significant anomalous Hall effect, which varies depending on the relative crystalline structure of different thickness samples. Additionally, a phase diagram of the AHE in Mn3Sn films annealed at different temperatures with different thicknesses was obtained, and current-induced antiferromagnetic state switching was achieved in Mn3Sn (20 nm) / Pt (4 nm) samples. These findings could potentially advance the development of antiferromagnetic spintronics.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Review
Physics, Applied
Kazumasa Iida, Jens Hanisch, Satoshi Hata, Akiyasu Yamamoto
Summary: Since the discovery of Fe-based superconductors, efforts have been made to grow single crystals and epitaxial thin films of them for both fundamental studies and applied research. Remarkably, most Fe-based superconductors have been successfully realized in the form of epitaxial thin films. However, due to various challenges, some compounds could only be obtained as single crystals. In recent years, these issues have been solved, and those compounds have been successfully fabricated as epitaxial thin films, allowing for easier evaluation of their application potential through transport critical current measurements.
SUPERCONDUCTOR SCIENCE & TECHNOLOGY
(2023)
Article
Materials Science, Multidisciplinary
K. K. Meng, J. K. Chen, Y. Wu, X. G. Xu, T. Kikkawa, L. P. Sun, D. Z. Hou, Q. Li, N. N. Zhang, Z. G. Fu, T. Zhu, Y. Jiang, E. Saitoh
Summary: In this study, the quantum correction to the anomalous Hall effects (AHEs) in magnetic PtMnGe (PMG) thin films was investigated. It was found that the quantum correction to the transport behavior in the two-dimensional PMG system remains robust, even in the presence of spin-dependent scattering.
Article
Materials Science, Multidisciplinary
Chao Lei, Thais Victa Trevisan, Olle Heinonen, R. J. McQueeney, A. H. MacDonald
Summary: We demonstrate that the quantum anomalous Hall effect can be observed in magnetic topological insulator thin films as long as the magnetizations of the top and bottom surface layers are parallel at certain temperature, regardless of the magnetization configuration of the interior layers.
Article
Multidisciplinary Sciences
Yalin Zhang, Tong Wang, Zhihe Wang, Zhongwen Xing
Summary: High quality FeySe1-xTex epitaxial thin films were fabricated using pulsed laser deposition technology. The chemical composition was affected by Te doping and the presence of Fe vacancies enhanced the superconducting transition temperature. The anisotropy, effective pining energy, and critical current density of the films were investigated.
SCIENTIFIC REPORTS
(2022)
Article
Physics, Condensed Matter
Xu Niu, Bin-Bin Chen, Ni Zhong, Ping-Hua Xiang, Chun-Gang Duan
Summary: Transition metal oxides possess unique properties such as topological Hall effects and magnetic skyrmions. In this review, we discuss recent observations of THE and skyrmions in SrRuO3 films and interfaces with various materials, with a focus on the electric tuning of THE.
JOURNAL OF PHYSICS-CONDENSED MATTER
(2022)
Article
Nanoscience & Nanotechnology
Xiaoning Wang, Xiaorong Zhou, Han Yan, Peixin Qin, Hongyu Chen, Ziang Meng, Zexin Feng, Li Liu, Zhiqi Liu
Summary: In this work, the emergence of the topological Hall effect in Mn3Sn films grown on Si is reported. Through a series of comparative experiments, it is found that the intriguing topological Hall effect phenomenon related to the appearance of the noncoplanar chiral spin structure is induced by the Mn3Sn/SiO2 interface. Moreover, it is discovered that the chiral spin structure of Mn3Sn can be effectively manipulated by current injection to a Pt/ Mn3Sn bilayer Hall bar device, demonstrating the feasibility of Si-based noncollinear antiferromagnetic spintronics.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Materials Science, Multidisciplinary
Yiting Liu, Gaurab Rimal, Pratyankara Narasimhan, Seongshik Oh
Summary: PdCoO2, a highly conductive and anisotropic material, shows promise for various applications. In this study, we found that when used as a cathode for water dissociation, hydrogen generated around the PdCoO2 film reduces the material and induces the emergence of anomalous Hall effect (AHE). Furthermore, we demonstrated that the AHE signal can be changed by the electrolytic process. Electrolytically-modified PdCoO2 films could have potential applications in spintronics.