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Title: Spin-orbit torque-driven magnetization switching and thermal effects studied in Ta\CoFeB\MgO nanowires

We demonstrate magnetization switching in out-of-plane magnetized Ta\CoFeB\MgO nanowires by current pulse injection along the nanowires, both with and without a constant and uniform magnetic field collinear to the current direction. We deduce that an effective torque arising from spin-orbit effects in the multilayer drives the switching mechanism. While the generation of a component of the magnetization along the current direction is crucial for the switching to occur, we observe that even without a longitudinal field thermally generated magnetization fluctuations can lead to switching. Analysis using a generalized Néel-Brown model enables key parameters of the thermally induced spin-orbit torques-driven switching process to be estimated, such as the attempt frequency and the effective energy barrier.
Authors:
;  [1] ;  [2] ; ; ; ;  [3] ; ;  [1]
  1. Institut für Physik, Johannes Gutenberg Universität-Mainz, Staudinger Weg 7, 55128 Mainz (Germany)
  2. (MAINZ), Staudinger Weg 9, 55128 Mainz (Germany)
  3. School of Physics and Astronomy, University of Leeds, Leeds LS2 9JT (United Kingdom)
Publication Date:
OSTI Identifier:
22350753
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 105; Journal Issue: 12; 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; BORON COMPOUNDS; COBALT COMPOUNDS; CURRENTS; FLUCTUATIONS; IRON COMPOUNDS; LAYERS; MAGNESIUM OXIDES; MAGNETIC FIELDS; MAGNETIZATION; NANOWIRES; QUANTUM WIRES; SPIN; TANTALUM; TEMPERATURE DEPENDENCE