Generalization of a circuit theory for current perpendicular to plane magnetoresistance and current-driven torque

Aurelien Manchon*, J. C. Slonczewski

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

Extensions of an existing circuit theory for current perpendicular to plane magnetoresistance and current-driven torque in noncollinear magnetic-multilayer pillar devices are presented. Our expressions for monodomain critical-current threshold Jc and giant magnetoresistance ΔR are firstly derived in terms of assumed spin-channel resistances for each of the two ferromagnets. Spinflips are thus neglected. We find a class of closed linear relationships connecting Jc -1 and ΔR. We then derive more general expressions for these quantities which take into account spin-flip relaxation. In this case, we assume analytically calculable linear 2×2 current-voltage matrices for the separate two-channel ferromagnets. These expressions again lead to a class of closed linear relationships connecting Jc -1 and ΔR. The latter generalization gives a simple theoretical framework to take into account bulk and interfacial spin flip and more complicated multilayer structures often used in experiments.

Original languageEnglish (US)
Article number184419
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume73
Issue number18
DOIs
StatePublished - May 24 2006
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Fingerprint Dive into the research topics of 'Generalization of a circuit theory for current perpendicular to plane magnetoresistance and current-driven torque'. Together they form a unique fingerprint.

Cite this