Publications (21)
Above 400 K Robust Perpendicular Ferromagnetic Phase in a Topological Insulator
Chi Tang, Cui-Zu Chang, Gejian Zhao +8
The quantum anomalous Hall effect (QAHE) that emerges under broken time-reversal symmetry in topological insulators (TI) exhibits many fascinating physical properties for potential…
Role of dimensional crossover on spin-orbit torque efficiency in magnetic insulator thin films
Qiming Shao, Chi Tang, Guoqiang Yu +19
Magnetic insulators (MIs) attract tremendous interest for spintronic applications due to low Gilbert damping and absence of Ohmic loss. Magnetic order of MIs can be manipulated and…
Epitaxial growth and properties of La0.7Sr0.3MnO3 thin films with micrometer wide atomic terraces
Wei Yuan, Yuelei Zhao, Chi Tang +4
La0.7Sr0.3MnO3 (LSMO) films with extraordinarily wide atomic terraces are epitaxially grown on SrTiO3 (100) substrates by pulsed laser deposition. Atomic force microscopy measureme…
Spin phonon interactions and magneto-thermal transport behavior in p-Si
Paul Lou, Laura de Sousa Oliveira, Chi Tang +2
The spin-phonon interaction is the dominant process for spin relaxation in Si, and as thermal transport in Si is dominated by phonons, one would expect spin polarization to influen…
Pressure-induced spin reorientation transition in layered ferromagnetic insulator Cr2Ge2Te6
Zhisheng Lin, Mark Lohmann, Zulfikhar A. Ali +9
Anisotropic magnetoresistance (AMR) of Cr2Ge2Te6 (CGT), a layered ferromagnetic insulator, is investigated under an applied hydrostatic pressure up to 2 GPa. The easy axis directio…
Scaling of Dzyaloshinskii Moriya interaction at heavy metal and ferromagnetic metal interfaces
Xin Ma, Guoqiang Yu, Chi Tang +5
The Dzyaloshinskii Moriya Interaction (DMI) at the heavy metal (HM) and ferromagnetic metal (FM) interface has been recognized as a key ingredient in spintronic applications. Here…
Topological Hall effect at above room temperature in heterostructures composed of a magnetic insulator and a heavy metal
Qiming Shao, Yawen Liu, Guoqiang Yu +7
Non-volatile memory and computing technology rely on efficient read and write of ultra-tiny information carriers that do not wear out. Magnetic skyrmions are emerging as a potentia…
Dirac-Surface-State Modulated Spin Dynamics in a Ferrimagnetic Insulator at Room Temperature
Chi Tang, Qi Song, Cui-Zu Chang +10
This work demonstrates dramatically modified spin dynamics of magnetic insulator (MI) by the spin-momentum locked Dirac surface states of the adjacent topological insulator (TI) wh…
Anomalous Hall hysteresis in Tm3Fe5O12/Pt with strain-induced perpendicular magnetic anisotropy
Chi Tang, Pathikumar Sellappan, Yawen Liu +3
We demonstrate robust interface strain-induced perpendicular magnetic anisotropy in atomically flat ferrimagnetic insulator Tm3Fe5O12 films grown with pulsed laser deposition on su…
Exploring interfacial exchange coupling and sublattice effect in heavy metal/ferrimagnetic insulator heterostructures using Hall measurements, x-ray magnetic circular dichroism, and neutron reflectometry
Qiming Shao, Alexander Grutter, Yawen Liu +13
We use temperature-dependent Hall measurements to identify contributions of spin Hall, magnetic proximity, and sublattice effects to the anomalous Hall signal in heavy metal/ferrim…
Heat-driven spin transport in a ferromagnetic metal
Yadong Xu, Bowen Yang, Chi Tang +4
As a non-magnetic heavy metal is attached to a ferromagnet, a vertically flowing heat-driven spin current is converted to a transverse electric voltage, which is known as the longi…
Deficiency of the Bulk Spin Hall Effect Model for Spin-Orbit Torques in Magnetic Insulator/Heavy Metal Heterostructures
Junxue Li, Guoqiang Yu, Chi Tang +9
Electrical currents in a magnetic insulator/heavy metal heterostructure can induce two simultaneous effects, namely, spin Hall magnetoresistance (SMR) on the heavy metal side and s…
Platinum/Yttrium Iron Garnet Inverted Structures for Spin Current Transport
Mohammed Aldosary, Junxue Li, Chi Tang +4
30-80 nm thick yttrium iron garnet (YIG) films are grown by pulsed laser deposition on a 5 nm thick sputtered Pt atop gadolinium gallium garnet substrate (GGG) (110). Upon post-gro…
Enhanced spin Seebeck effect signal due to spin-momentum locked topological surface states
Zilong Jiang, Cui-Zu Chang, Massoud Ramezani Masir +5
Spin-momentum locking in protected surface states enables efficient electrical detection of magnon decay at a magnetic-insulator/topological-insulator heterojunction. Here we demon…
Induced magneto-transport properties at palladium/yttrium iron garnet interface
Tao Lin, Chi Tang, Jing Shi
As a thin layer of palladium (Pd) is directly deposited on an yttrium iron garnet or YIG (Y3Fe5O12) magnetic insulator film, Pd develops both low- and high-field magneto-transport…
Approaching quantum anomalous Hall effect in proximity-coupled YIG/graphene/h-BN sandwich structure
Chi Tang, Bin Cheng, Mohammed Aldosary +6
Quantum anomalous Hall state is expected to emerge in Dirac electron systems such as graphene under both sufficiently strong exchange and spin-orbit interactions. In pristine graph…
Independent tuning of electronic properties and induced ferromagnetism in topological insulators with heterostructure approach
Zilong Jiang, Cui-Zu Chang, Chi Tang +3
The quantum anomalous Hall effect (QAHE) has been recently demonstrated in Cr- and V-doped three-dimensional topological insulators (TIs) at temperatures below 100 mK. In those mat…
Proximity-induced ferromagnetism in graphene revealed by anomalous Hall effect
Zhiyong Wang, Chi Tang, Raymond Sachs +2
We demonstrate the anomalous Hall effect (AHE) in single-layer graphene exchange-coupled to an atomically flat yttrium iron garnet (YIG) ferromagnetic thin film. The anomalous Hall…
Observation of magnon-mediated current drag in Pt/yttrium iron garnet/Pt(Ta) trilayers
Junxue Li, Yadong Xu, Mohammed Aldosary +5
Pure spin current, a flow of spin angular momentum without flow of any companying net charge, is generated in two common ways. One makes use of the spin Hall effect in normal metal…
An integrated approach to doped thin films with strain tunable magnetic anisotropy: Powder synthesis, target preparation and pulsed laser deposition of Bi:YIG
Pathikumar Sellappan, Chi Tang, Jing Shi +1
We present a synthesis/processing method for fabricating ferrimagnetic insulator (Bi-doped yttrium iron garnet) thin films with tunable magnetic anisotropy. Since the desired magne…
Differential Evolution Algorithm Based Hyperparameter Selection of Gated Recurrent Unit for Electrical Load Forecasting
Anuvab Sen, Vedica Gupta, Chi Tang
Accurate load forecasting remains a formidable challenge in numerous sectors, given the intricate dynamics of dynamic power systems, which often defy conventional statistical model…