TY - JOUR
T1 - Current-Nonlinear Hall Effect and Spin-Orbit Torque Magnetization Switching in a Magnetic Topological Insulator
AU - Yasuda, K.
AU - Tsukazaki, A.
AU - Yoshimi, R.
AU - Kondou, K.
AU - Takahashi, K. S.
AU - Otani, Y.
AU - Kawasaki, M.
AU - Tokura, Y.
N1 - Funding Information:
We thank S. Seki, F. Kagawa, H. Oike, and M. Kawamura for fruitful discussions. K. Y. is supported by the Japan Society for the Promotion of Science (JSPS) through a research fellowship for young scientists (No. 16J03476). This research was supported by the Japan Society for the Promotion of Science through the Funding Program for World-Leading Innovative R & D on Science and Technology (FIRST Program) on “Quantum Science on Strong Correlation” initiated by the Council for Science and Technology Policy and by JSPS Grant-in-Aid for Scientific Research(S) No. 24224009 and No. 24226002 and No. JP15H05853 from MEXT, Japan. This work was also supported by CREST, JST.
Publisher Copyright:
© 2017 American Physical Society.
PY - 2017/9/28
Y1 - 2017/9/28
N2 - The current-nonlinear Hall effect or second harmonic Hall voltage is widely used as one of the methods for estimating charge-spin conversion efficiency, which is attributed to the magnetization oscillation by spin-orbit torque (SOT). Here, we argue the second harmonic Hall voltage under a large in-plane magnetic field with an in-plane magnetization configuration in magnetic-nonmagnetic topological insulator (TI) heterostructures, Crx(Bi1-ySby)2-xTe3/(Bi1-ySby)2Te3, where it is clearly shown that the large second harmonic voltage is governed not by SOT but mainly by asymmetric magnon scattering without macroscopic magnetization oscillation. Thus, this method does not allow an accurate estimation of charge-spin conversion efficiency in TI. Instead, the SOT contribution is exemplified by current pulse induced nonvolatile magnetization switching, which is realized with a current density of 2.5×1010 A m-2, showing its potential as a spintronic material.
AB - The current-nonlinear Hall effect or second harmonic Hall voltage is widely used as one of the methods for estimating charge-spin conversion efficiency, which is attributed to the magnetization oscillation by spin-orbit torque (SOT). Here, we argue the second harmonic Hall voltage under a large in-plane magnetic field with an in-plane magnetization configuration in magnetic-nonmagnetic topological insulator (TI) heterostructures, Crx(Bi1-ySby)2-xTe3/(Bi1-ySby)2Te3, where it is clearly shown that the large second harmonic voltage is governed not by SOT but mainly by asymmetric magnon scattering without macroscopic magnetization oscillation. Thus, this method does not allow an accurate estimation of charge-spin conversion efficiency in TI. Instead, the SOT contribution is exemplified by current pulse induced nonvolatile magnetization switching, which is realized with a current density of 2.5×1010 A m-2, showing its potential as a spintronic material.
UR - http://www.scopus.com/inward/record.url?scp=85030169735&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85030169735&partnerID=8YFLogxK
U2 - 10.1103/PhysRevLett.119.137204
DO - 10.1103/PhysRevLett.119.137204
M3 - Article
C2 - 29341677
AN - SCOPUS:85030169735
VL - 119
JO - Physical Review Letters
JF - Physical Review Letters
SN - 0031-9007
IS - 13
M1 - 137204
ER -