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

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Author(s): Paul M. Haney; Christian Heiliger; Mark D. Stiles;
Title: Bias dependence of magnetic exchange interactions: application to interlayer exchange coupling in spin valves.
Published: February 03, 2009
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
Pages: pp. 1 - 9
Keywords: Interlayer exchange coupling; spin transfer torque
Research Areas: Nanomagnetics
PDF version: PDF Document Click here to retrieve PDF version of paper (255KB)