Bulletin of the American Physical Society
APS March Meeting 2022
Volume 67, Number 3
Monday–Friday, March 14–18, 2022; Chicago
Session T68: Magnetotransport in Topological Materials II
11:30 AM–2:18 PM,
Thursday, March 17, 2022
Room: Hyatt Regency Hotel -Hyde Park B
Sponsoring
Units:
DMP GMAG DCMP
Chair: Shafayat Hossain, Princeton University; Shirin Mozaffari, University of Tennessee
Abstract: T68.00012 : Giant Self-Production of Spin Current and Self-Torque on Single GdFeCo Magnetic Layers*
1:42 PM–2:18 PM
Presenter:
Juan-Carlos Rojas-Sanchez
(University of Lorraine, France)
Author:
Juan-Carlos Rojas-Sanchez
(University of Lorraine, France)
We studied ferrimagnetic FiM GdFeCo alloys in which the 5d band of Gd induces large spin-orbit couplings. We demonstrate the giant spin current emission (SAHE+SHE) by GdFeCo from the current-induced modulation of the ferromagnetic resonance linewidth of NiFe in GdFeCo/Cu/NiFe. Overall efficiency is 25 times more important in GdFeCo/Cu/NiFe than in Pt/Cu/NiFe.
The study of the self-torque is carried out by harmonic Hall voltage measurements in samples where the GdFeCo layer exhibits out-of-plane magnetization. We compare the self-torque in GdFeCo/Cu with torques induced by Pt or Ta in Pt/Cu/GdFeCo and Ta/Cu/GdFeCo2. Taking advantage of the different characteristics temperatures in FiM2-4, we show the features that differentiate self-torque from what we know so far, the "external" spin-orbit torque3.
These results pave the way for new architectures to achieve switching by self-SOT and skyrmions manipulation.
Work performed with co-authors in Ref. 2,3.
1. Rojas-Sánchez, J. C. & Fert, A. Compared Efficiencies of Conversions between Charge and Spin Current by Spin-Orbit Interactions in Two- and Three-Dimensional Systems. Phys. Rev. Appl. 11, 054049 (2019).
2. Céspedes-Berrocal D., Damas H. et al. Current-Induced Spin Torques on Single GdFeCo Magnetic Layers. Adv. Materials 33, 2007047 (2021)
3. Damas H. et al. In preparation
4. Pham, TH et al, Thermal contribution to the spin-orbit torque in metallic-ferrimagnetic systems. Phys. Rev. Appl. 9, 064032 (2018).
*We acknowledge ANR-19-CE24-0016-01 (TOPTRONICS) and projects in ref 2,3.
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