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Accueil du site > Spin-Motive-Forces and Spin-Transfer Torque for Spin-Valves and Domain

The interaction of magnetic domains with electrical currents has potentially far reaching applications for spintronics. The requirements of energy conservation are reflected by spin- (smf) and electro-motive-forces (emf) [1]. For spin-valves and domain walls this smf redistributes the currents between the different possible conduction channels in a manner that significantly modifies the dynamics and introduces magnetic relaxation. Our approach to domain walls [2] has been extended to spin-valves. The results are consistent with the requirements of angular momentum and energy conservation but differ in a number of important ways from those obtained when the Sloncewski torque transfer term is added to the Landau-Liftshitz equations with either Gilbert or Landau-Liftshitz relaxation [3].

[1] S. E. Barnes and S. Maekawa : Phys. Rev. Lett. 98, 246601 (2007)

[2] S. E. Barnes and S. Maekawa : Phys. Rev. Lett. 95, 107204 (2005).

[3] See e.g., Concepts in Spin Electronics, ed. by S. Maekawa (Oxford Press, 2006).