Bias dependence of magnetic exchange interactions: application to interlayer exchange coupling in spin valves.

Published

February 3, 2009

Author(s)

Paul M. Haney, Christian Heiliger, Mark D. Stiles

Abstract

We study how a bias voltage changes magnetic exchange interactions. We derive a general expression for magnetic exchange interactions for open systems under a bias potential, and apply it to spin valves. We find that for metallic systems, the interlayer exchange coupling shows a weak, oscillatory dependence on the bias potential. For tunneling systems, we find a quadratic dependence on the bias potential, and derive an approximate expression for this bias dependence for a toy model. We give general conditions for when the bias dependence must be quadratic.

Citation

Physical Review B (Condensed Matter and Materials Physics)

Volume

79

Issue

5

Pub Type

Journals

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Keywords

Interlayer exchange coupling, spin transfer torque

Citation

Haney, P. , Heiliger, C. and Stiles, M. (2009), Bias dependence of magnetic exchange interactions: application to interlayer exchange coupling in spin valves., Physical Review B (Condensed Matter and Materials Physics), [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=620602 (Accessed October 21, 2025)