Phys. Rev. B 78, 054429 (2008) [9 pages]Signal propagation in time-dependent spin transportReceived 20 June 2008; revised 25 July 2008; published 20 August 2008 This paper analyzes theoretically the signal propagation in spin transport by modulating the current passing through magnetic multilayers. Using a macroscopic description of spin transport based on the dynamical Boltzmann equation, we show that time-dependent spin transport possesses a wavelike character that leads to modifications of pure spin-diffusion dynamics. In particular, the wavelike characteristics allow one to extract a finite spin signal-propagation velocity. © 2008 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevB.78.054429
DOI:
10.1103/PhysRevB.78.054429
PACS:
72.25.−b, 75.40.Gb, 75.47.−m, 85.75.−d
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