Dynamics of current-induced magnetic superstructures in exchange-spring devices

Anatoli M. Kadigrobov, Robert I. Shekhter, Mats Jonson

Research output: Contribution to journalArticle

Abstract

Thermoelectric manipulation of the magnetization of a magnetic layered stack in which a low-Curie temperature magnet is sandwiched between two strong magnets (exchange spring device) is considered. Controllable Joule heating produced by a current flowing in the plane of the magnetic stack (CIP configuration) induces a spatial magnetic and thermal structure along the current flow—a magnetothermal-electric domain (soliton). We show that such a structure can experience oscillatory in time dynamics if the magnetic stack is incorporated into an electric circuit in series with an inductor. The excitation of these magnetothermionic oscillations follow the scenario either of “soft” or “hard” instability: in the latter case oscillations arise if the initial perturbation is large enough. The frequency of the temporal oscillations is of the order of 10^5–10^7 s^{–1} for current densities of 10^6–10^7 A/cm^2.
Original languageEnglish
Pages (from-to)626-632
Number of pages7
JournalLow Temperature Physics
Volume38
Issue number7
DOIs
Publication statusPublished - Jul 2012

Keywords

  • magnetic multilayer
  • magnetothermoelectric oscillations
  • exchange-spring device

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