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Bias dependence of magnetic exchange interactions: application to interlayer exchange coupling in spin valves.
Published
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)
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 14, 2025)