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

Aurelien Manchon, S. Zhang, K.-J. Lee

Research output: Contribution to journalArticlepeer-review

18 Scopus citations

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, n∊N). The analysis of spin torque and conductance measurements displays a signature revealing the origin (asymmetry or inelastic scattering) of the discrepancy.
Original languageEnglish (US)
JournalPhysical Review B
Volume82
Issue number17
DOIs
StatePublished - Nov 15 2010

Fingerprint Dive into the research topics of 'Signatures of asymmetric and inelastic tunneling on the spin torque bias dependence'. Together they form a unique fingerprint.

Cite this