Signatures of asymmetric and inelastic tunneling on the spin torque bias dependence

A. Manchon, Shufeng Zhang, K. J. Lee

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

The influence of structural asymmetries (barrier height and exchange splitting), as well as inelastic scattering (magnons and phonons) on the bias dependence of the spin transfer torque in a magnetic tunnel junction is studied theoretically using the free-electron model. We show that they modify the "conventional" bias dependence of the spin transfer torque, together with the bias dependence of the conductance. In particular, both structural asymmetries and bulk (inelastic) scattering add antisymmetric terms to the perpendicular torque (V and je |V|) while the interfacial inelastic scattering conserves the junction symmetry and only produces symmetric terms ( ⊃|V⊃| n, nN). The analysis of spin torque and conductance measurements displays a signature revealing the origin (asymmetry or inelastic scattering) of the discrepancy.

Original languageEnglish (US)
Article number174420
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume82
Issue number17
DOIs
StatePublished - Nov 15 2010

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Inelastic scattering
torque
inelastic scattering
Torque
signatures
asymmetry
Tunnel junctions
Phonons
tunnel junctions
free electrons
magnons
phonons
Electrons
symmetry
scattering

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials

Cite this

Signatures of asymmetric and inelastic tunneling on the spin torque bias dependence. / Manchon, A.; Zhang, Shufeng; Lee, K. J.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 82, No. 17, 174420, 15.11.2010.

Research output: Contribution to journalArticle

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