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Theory of Spin-transfer Torque

Micromagnetism

Micromagnetics of Spin Angular Momentum Transfer

  1. Mark D. Stiles

Published Online: 15 DEC 2007

DOI: 10.1002/9780470022184.hmm219

Handbook of Magnetism and Advanced Magnetic Materials

Handbook of Magnetism and Advanced Magnetic Materials

How to Cite

Stiles, M. D. 2007. Theory of Spin-transfer Torque. Handbook of Magnetism and Advanced Magnetic Materials. .

Author Information

  1. National Institute of Standards and Technology, Gaithersburg, MD, USA

Publication History

  1. Published Online: 15 DEC 2007

Abstract

In magnetic multilayers, the spin-polarized currents flowing between the magnetic layers can exert torques on the magnetizations of the layers when the magnetizations are not collinear. The theory of these spin-transfer torques is developed in terms of semiclassical transport calculations coupled with quantum-mechanical calculations of the behavior of spins at interfaces. The result is an expression for the torque in terms of the geometry of the devices and the magnetic configuration.

Keywords:

  • magnetic multilayers;
  • giant magnetoresistance;
  • spin transfer torque;
  • exchange interaction;
  • spin-dependent transport;
  • spin-dependent resistance;
  • micromagnetics;
  • precession;
  • point contacts;
  • nanopillars;
  • spin diffusion;
  • spin accumulation;
  • spin-flip scattering;
  • spin pumping