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Title: Spin-orbit torque opposing the Oersted torque in ultrathin Co/Pt bilayers

Current-induced torques in ultrathin Co/Pt bilayers were investigated using an electrically driven ferromagnetic resonance technique. The angle dependence of the resonances, detected by a rectification effect as a voltage, was analysed to determine the symmetries and relative magnitudes of the spin-orbit torques. Both anti-damping (Slonczewski) and field-like torques were observed. As the ferromagnet thickness was reduced from 3 to 1 nm, the sign of the sum of the field-like torque and Oersted torque reversed. This observation is consistent with the emergence of a Rashba spin orbit torque in ultra-thin bilayers.
Authors:
; ; ; ;  [1] ; ; ;  [2]
  1. Cavendish Laboratory, University of Cambridge, Cambridge CB3 0HE (United Kingdom)
  2. School of Physics and Astronomy, University of Nottingham, Nottingham NG7 2RD (United Kingdom)
Publication Date:
OSTI Identifier:
22283190
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 104; Journal Issue: 6; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; COBALT; DAMPING; ELECTRIC CURRENTS; ELECTRIC POTENTIAL; FERROMAGNETIC MATERIALS; FERROMAGNETIC RESONANCE; FERROMAGNETISM; INTERFACES; LAYERS; ORBITS; PLATINUM; SPIN; SYMMETRY; THICKNESS; TORQUE