Article
Chemistry, Physical
Can Liu, Huai Zhang, Zefang Li, Yuan Yan, Yajiu Zhang, Zhipeng Hou, Xuewen Fu
Summary: We report the magnetometry and magnetoelectric transport properties of TmMn6Sn6 single crystal, which coexists with Tm and Mn magnetic sublattices. We reveal that this compound displays multiple magnetic structures with the increase of in-plane magnetic field. The combination of non-collinear magnetic structure and real-space Berry curvature leads to a remarkable topological Hall effect over an extensive temperature range.
SURFACES AND INTERFACES
(2023)
Article
Materials Science, Multidisciplinary
Ke Wang, Liang Wu, Zikun Xu, Zhihong Lu, Rui Xiong
Summary: We investigate the extraordinary Hall effect of sputtered amorphous ferrimagnetic GdFeCo alloy films using a composite target method. The sign of the extraordinary Hall resistance changes from positive to negative as the alloy film transitions from FeCo-rich to Gd-rich phase. The large extraordinary Hall coefficient indicates the potential applications of amorphous ferrimagnetic GdFeCo alloy films in perpendicular magnetoelectronic devices.
MATERIALS TODAY COMMUNICATIONS
(2023)
Article
Materials Science, Multidisciplinary
Ke Wang, Yongming Tang, Xiaopeng Xiao, Zhan Xu, Jian Liu
Summary: TbFeCo alloy films with adjustable coercivity and perpendicular magnetic anisotropy can be achieved by controlling the sputtering power and gas flow rate during fabrication. Proper tuning of these parameters allows for the optimization of the films' magnetic properties, which is crucial for the design of high-density spintronic devices.
JOURNAL OF MATERIALS SCIENCE
(2021)
Article
Chemistry, Physical
Sudhansu Sekhar Das, Gregory Kopnov, Alexander Gerber
Summary: Palladium-based alloys are potential alternatives to pure palladium, and the effect of diluting the palladium concentration on hydrogen absorption capacity needs to be considered. This study demonstrates the use of resistivity measurements of thin film alloy samples as a qualitative high-throughput screening method for studying hydrogen absorbing properties.
Article
Physics, Multidisciplinary
Igor Lyalin, Sanaz Alikhah, Marco Berritta, Peter M. Oppeneer, Roland K. Kawakami
Summary: This study reports the direct observation of current-induced orbital accumulation on the surface of a light 3d transition metal, Cr, using magneto-optical detection. The orbital polarization is transverse to the current direction and scales linearly with current density, consistent with the orbital Hall effect.
PHYSICAL REVIEW LETTERS
(2023)
Article
Nanoscience & Nanotechnology
Bing Han, Shaobo Yu, Hui Wang, Yanshan Lu, Huai-Jun Lin
Summary: In this study, Mg85Ni14Ce1 amorphous alloy films with different thicknesses were prepared, and the nanosize effect on hydrogen desorption and cycling properties was investigated. It was found that as the size decreases, the hydrogen storage kinetics of the alloy greatly increase, and the nanosized amorphous alloys can reversibly absorb and desorb hydrogen at a low temperature. Moreover, the alloy structure can be fully recovered after hydrogen absorption and desorption cycles. Therefore, nanosized amorphous alloys are promising candidates for reversible hydrogen storage applications.
SCRIPTA MATERIALIA
(2022)
Article
Chemistry, Multidisciplinary
Ruiyue Chu, Liang Liu, Bin Cui, Weikang Liu, Taiyu An, Xue Ren, Tingting Miao, Bin Cheng, Jifan Hu
Summary: The reversible and nonvolatile manipulation of the spin Hall effect of Pt has been achieved using H2O-doped ionic liquid gating. The spin Hall angle can be modulated by 48% within an accessible gate voltage range. This discovery provides a method for the dynamic control of charge-to-spin current conversion and promotes the development of spintronic devices.
Article
Physics, Multidisciplinary
Sandra Ruiz-Gomez, Ruben Guerrero, Muhammad W. Khaliq, Claudia Fernandez-Gonzalez, Jordi Prat, Andres Valera, Simone Finizio, Paolo Perna, Julio Camarero, Lucas Perez, Lucia Aballe, Michael Foerster
Summary: The spin Hall effect and the inverse spin Hall effect are important spin-charge conversion mechanisms. The direct spin Hall effect can induce surface spin accumulation in nonmagnetic conductors. However, most detection schemes involve interfaces, resulting in considerable scattering in the reported data. Interface-free measurements on highly Bi-doped Cu (Cu95Bi5) using x-ray spectroscopy reveal a similar induced magnetic moment as that of Pt measured by magneto-optics, highlighting the potential of CuBi for spin-charge conversion applications.
Article
Chemistry, Physical
Nerijus Armakavicius, Philipp Kuhne, Jens Eriksson, Chamseddine Bouhafs, Vallery Stanishev, Ivan G. Ivanov, Rositsa Yakimova, Alexei A. Zakharov, Ameer Al-Temimy, Camilla Coletti, Mathias Schubert, Vanya Darakchiev
Summary: In this study, the application of THz-OHE was used to determine the directionally dependent free charge carrier properties of ambient-doped monolayer and quasi-freestanding-bilayer epitaxial graphene on 4H-SiC(0001). Anisotropic hole mobility parameters were found for the first time, with lower mobility in direction perpendicular to the SiC surface steps and higher mobility along the steps in quasi-free-standing-bilayer graphene. Nanoscale microscopy and optical spectroscopy were used to investigate the origin of the anisotropy, proposing that step edges introduce intrinsic scattering in quasi-free-standing-bilayer graphene.
Article
Materials Science, Multidisciplinary
Pieter M. Gunnink, Rembert A. Duine, Andreas Rueckriegel
Summary: In this study, we derived the anomalous Hall contributions from dipolar interactions in magnetic insulators, revealing the role of magnons as carriers of angular momentum in diffusive spin transport. We calculated the anomalous and magnon spin conductivities for yttrium iron garnet (YIG) thin films, showing a finite anomalous Hall conductivity for a magnetic field perpendicular to the film. Moreover, we demonstrated the possibility of electrical detection and injection of spin, predicting experimentally measurable Hall coefficients for a variety of temperatures and magnetic field strengths.
Article
Physics, Applied
Anupam K. Singh, Gaurav K. Shukla, Sanjay Singh
Summary: This paper reports the intrinsic anomalous Hall conductivity (AHC) and topological Hall effect (THE) in the bulk Ni2MnGa magnetic shape memory alloy. The intrinsic Berry phase mechanism dominates the AHC in all the structural phases of Ni2MnGa, and an additional contribution in the Hall resistivity is observed as THE. The THE arises due to the real space Berry curvature induced by topologically protected magnetic skyrmion textures in the martensite and premartensite phases of Ni2MnGa.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
Nisha Shahi, Ajit K. Jena, Gaurav K. Shukla, Vishal Kumar, Shivani Rastogi, K. K. Dubey, Indu Rajput, Sonali Baral, Archana Lakhani, Seung-Cheol Lee, Satadeep Bhattacharjee, Sanjay Singh
Summary: This study provides a detailed investigation of the crystal structure and anomalous Hall effect in Mn2CoAl, revealing the presence of antisite disorder between Mn and Al atoms, which enhances the Berry curvature and increases the value of intrinsic anomalous Hall conductivity.
Article
Chemistry, Physical
Charlotte Evans, Lucia T. Gan, Rui Yang, Mahdiyeh Abbasi, Xifan Wang, Rachel Traylor, Jonathan A. Fan, Douglas Natelson
Summary: This study demonstrates that the photothermoelectric effect can be utilized to detect low-concentration platinum gradients in wire-shaped gold nanostructures with high sensitivity. Even a small variation in platinum concentration along a 1 μm length of gold wire can significantly impact the local Seebeck coefficient. These findings suggest that the photothermoelectric effect is a highly sensitive tool for detecting low-level impurity concentrations in host metals in a wire geometry.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Materials Science, Multidisciplinary
Jing Rao, Subin Lee, Gerhard Dehm, Maria Jazmin Duarte
Summary: Hydrogen embrittlement in metallic materials was investigated during the process of hydrogen loading. The mechanical response of ferritic Fe-16Cr, Fe-21Cr, and Fe-4Al alloys was studied using in situ nanoindentation with electrochemical backside hydrogen charging. The hardness increased linearly with increasing hydrogen content until a quasi-equilibrium state was reached, while the Young's modulus remained unaffected. Increasing the chromium content enhanced the hardening effect.
MATERIALS & DESIGN
(2023)
Article
Chemistry, Multidisciplinary
Lixuan Tai, Bingqian Dai, Jie Li, Hanshen Huang, Su Kong Chong, Kin L. Wong, Huairuo Zhang, Peng Zhang, Peng Deng, Christopher Eckberg, Gang Qiu, Haoran He, Di Wu, Shijie Xu, Albert Davydov, Ruqian Wu, Kang L. Wang
Summary: In this study, the researchers confirm the genuine topological Hall effect (THE) with the anomalous Hall effect (AHE) through transport and magneto-optical Kerr effect microscopy. The presence of magnetic skyrmions is directly observed, and genuine THE is found to occur in the transition region of the AHE. The researchers also distinguish between artifact THE and genuine THE using minor loops, temperature dependence, and gate dependence.
