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Title: Ultrafast magnetization switching by spin-orbit torques

Spin-orbit torques induced by spin Hall and interfacial effects in heavy metal/ferromagnetic bilayers allow for a switching geometry based on in-plane current injection. Using this geometry, we demonstrate deterministic magnetization reversal by current pulses ranging from 180 ps to ms in Pt/Co/AlO{sub x} dots with lateral dimensions of 90 nm. We characterize the switching probability and critical current I{sub c} as a function of pulse length, amplitude, and external field. Our data evidence two distinct regimes: a short-time intrinsic regime, where I{sub c} scales linearly with the inverse of the pulse length, and a long-time thermally assisted regime, where I{sub c} varies weakly. Both regimes are consistent with magnetization reversal proceeding by nucleation and fast propagation of domains. We find that I{sub c} is a factor 3–4 smaller compared to a single domain model and that the incubation time is negligibly small, which is a hallmark feature of spin-orbit torques.
Authors:
; ; ; ;  [1] ; ; ; ;  [2] ;  [3] ;  [3]
  1. Department of Materials, ETH Zürich, Hönggerbergring 64, Zürich CH-8093 (Switzerland)
  2. Université Grenoble Alpes, SPINTEC, 38000 Grenoble (France)
  3. (France)
Publication Date:
OSTI Identifier:
22392061
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 105; Journal Issue: 21; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ALUMINIUM OXIDES; COBALT; CRITICAL CURRENT; FERROMAGNETIC MATERIALS; HEAVY METALS; LAYERS; MAGNETIZATION; ORBITS; PLATINUM; PULSES; SPIN