Current-Induced Spin Torques on Single GdFeCo Magnetic Layers

David Céspedes-Berrocal, Heloïse Damas, Sébastien Petit-Watelot, Davide Maccariello, Ping Tang, Aldo Arriola-Córdova, Pierre Vallobra, Yong Xu, Jean Loïs Bello, Elodie Martin, Sylvie Migot, Jaafar Ghanbaja, Shufeng Zhang, Michel Hehn, Stéphane Mangin, Christos Panagopoulos, Vincent Cros, Albert Fert, Juan Carlos Rojas-Sánchez

Research output: Contribution to journalArticlepeer-review

Abstract

Spintronics exploit spin-orbit coupling (SOC) to generate spin currents, spin torques, and, in the absence of inversion symmetry, Rashba and Dzyaloshinskii–Moriya interactions. The widely used magnetic materials, based on 3d metals such as Fe and Co, possess a small SOC. To circumvent this shortcoming, the common practice has been to utilize the large SOC of nonmagnetic layers of 5d heavy metals (HMs), such as Pt, to generate spin currents and, in turn, exert spin torques on the magnetic layers. Here, a new class of material architectures is introduced, excluding nonmagnetic 5d HMs, for high-performance spintronics operations. Very strong current-induced torques exerted on single ferrimagnetic GdFeCo layers, due to the combination of large SOC of the Gd 5d states and inversion symmetry breaking mainly engineered by interfaces, are demonstrated. These “self-torques” are enhanced around the magnetization compensation temperature and can be tuned by adjusting the spin absorption outside the GdFeCo layer. In other measurements, the very large emission of spin current from GdFeCo, 80% (20%) of spin anomalous Hall effect (spin Hall effect) symmetry is determined. This material platform opens new perspectives to exert “self-torques” on single magnetic layers as well as to generate spin currents from a magnetic layer.

Original languageEnglish (US)
Article number2007047
JournalAdvanced Materials
Volume33
Issue number12
DOIs
StatePublished - Mar 25 2021

Keywords

  • amorphous ferrimagnetic GdFeCo
  • spin-orbit torque
  • spin-orbitronics
  • spintronics

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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