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Landauer theory of ballistic torkances in noncollinear spin valves
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Materials Science.
2009 (English)In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 80, no 10, 104432- p.Article in journal (Refereed) Published
Abstract [en]

We present a theory of voltage-induced spin-transfer torques in ballistic noncollinear spin valves. The torkance on one ferromagnetic layer is expressed in terms of scattering coefficients of the whole spin valve, in analogy to the Landauer conductance formula. The theory is applied to Co/Cu/Ni(001)-based systems where long-range oscillations of the Ni torkance as a function of Ni thickness are predicted. The oscillations represent a novel quantum size effect due to the noncollinear magnetic structure. The oscillatory behavior of the torkance contrasts a thickness-independent trend of the conductance.

Place, publisher, year, edition, pages
2009. Vol. 80, no 10, 104432- p.
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:uu:diva-127492DOI: 10.1103/PhysRevB.80.104432ISI: 000270383100075OAI: oai:DiVA.org:uu-127492DiVA: diva2:330429
Available from: 2010-07-15 Created: 2010-07-13 Last updated: 2010-07-15Bibliographically approved

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