137 citations · 799 across the 30 of their papers we have counts for
15 papers · 1 filter
Comments on the formula to extract current-induced torques from the harmonic Hall voltage measurements
Yong-Chang Lau, Yukihiro Marui, Zhendong Chi +2
We examine the formulas commonly used to estimate current-induced spin-orbit torques from harmonic Hall voltage measurements. In particular, we focus on the factor of two discrepan…
Enhancement of Spin-Charge Conversion Efficiency for CoSnS across Transition from Paramagnetic to Ferromagnetic Phase
Takeshi Seki, Yong-Chang Lau, Junya Ikeda +5
CoSnS (CSS) is one of the shandite compounds and becomes a magnetic Weyl semimetal candidate below the ferromagnetic phase transition temperature ($\textit{T}_\te…
Spin Hall effect driven by the spin magnetic moment current in Dirac materials
Zhendong Chi, Guanxiong Qu, Yong-Chang Lau +5
The spin Hall effect of a Dirac Hamiltonian system is studied using semiclassical analyses and the Kubo formula. In this system, the spin Hall conductivity is dependent on the defi…
Intercorrelated anomalous Hall and spin Hall effect in kagome-lattice CoSnS-based shandite films
Yong-Chang Lau, Junya Ikeda, Kohei Fujiwara +5
Magnetic Weyl semimetals (mWSMs) are characterized by linearly dispersive bands with chiral Weyl node pairs associated with broken time reversal symmetry. One of the hallmarks of m…
Interface enhanced helicity dependent photocurrent in metal/semimetal bilayers
H. Hirose, M. Kawaguchi, Y. -C. Lau +2
One of the hallmarks of light-spin interaction in solids is the appearance of photocurrent that depends on the light helicity. Recent studies have shown that helicity dependent pho…
Giant inverse Faraday effect in Dirac semimetals
Masashi Kawaguchi, Hana Hirose, Zhendong Chi +3
We have studied helicity dependent photocurrent (HDP) in Bi-based Dirac semimetal thin films. HDP increases with film thickness before it saturates, changes its sign when the major…
The spin Hall effect of Bi-Sb alloys driven by thermally excited Dirac-like electrons
Zhendong Chi, Yong-Chang Lau, Xiandong Xu +3
We have studied the charge to spin conversion in BiSb/CoFeB heterostructures. The spin Hall conductivity (SHC) of the sputter deposited heterostructures exhibits a high…
Giant spin-orbit torque in a single ferrimagnetic metal layer
Simon Lenne, Yong-Chang Lau, Ajay Jha +6
Antiferromagnets and compensated ferrimagnets offer opportunities to investigate spin dynamics in the 'terahertz gap' because their resonance modes lie in the 0.3 THz to 3 THz rang…
Dzyaloshinskii-Moriya interaction and spin-orbit torque at the Ir/Co interface
Yuto Ishikuro, Masashi Kawaguchi, Naoaki Kato +2
We studied the spin torque efficiency and the Dzyaloshinskii-Moriya interaction (DMI) of heterostructures that contain interface(s) of Ir and Co. The current-induced shifts of the…
Circular photogalvanic effect in Cu/Bi bilayers
Hana Hirose, Naoto Ito, Masashi Kawaguchi +2
We have studied the circular photogalvanic effect (CPGE) in Cu/Bi bilayers. When a circularly polarized light in the visible range is irradiated to the bilayer from an oblique inci…
Domain wall resistance in CoFeB-based heterostructures with interface Dzyaloshinskii-Moriya interaction
Yuto Ishikuro, Masashi Kawaguchi, Yong-Chang Lau +2
We have studied the domain wall resistance in W/Ta/CoFeB/MgO heterostructures. The Ta layer thickness is varied to control the type of domain walls via changes in the interfacial D…
Current-induced modulation of interfacial Dzyaloshinskii-Moriya interaction
Naoaki Kato, Masashi Kawaguchi, Yong-Chang Lau +3
The Dzyaloshinskii-Moriya (DM) interaction is an antisymmetric exchange interaction that is responsible for the emergence of chiral magnetism. The origin of the DM interaction, how…
Anomalous spin Hall magnetoresistance in Pt/Co bilayers
Masashi Kawaguchi, Daiki Towa, Yong-Chang Lau +2
We have studied the spin Hall magnetoresistance (SMR), the magnetoresistance within the plane transverse to the current flow, of Pt/Co bilayers. We find that the SMR increases with…
The Spin Nernst effect in Tungsten
Peng Sheng, Yuya Sakuraba, Yong-Chang Lau +3
The spin Hall effect allows generation of spin current when charge current is passed along materials with large spin orbit coupling. It has been recently predicted that heat curren…
Spin-orbit torque switching without external field with a ferromagnetic exchange-biased coupling layer
Yong-Chang Lau, Davide Betto, Karsten Rode +2
Magnetization reversal of a perpendicular ferromagnetic free layer by spin-orbit torque (SOT) is an attractive alternative to spin-transfer torque (STT) switching in magnetic rando…