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Detection of microwave phase variation in nanometre-scale magnetic heterostructures
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Molecular and condensed matter physics.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Molecular and condensed matter physics.
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2013 (English)In: Nature Communications, ISSN 2041-1723, E-ISSN 2041-1723, Vol. 4, 2025- p.Article in journal (Refereed) Published
Abstract [en]

The internal phase profile of electromagnetic radiation determines many functional properties of metal, oxide or semiconductor heterostructures. In magnetic heterostructures, emerging spin electronic phenomena depend strongly upon the phase profile of the magnetic field (H) over tilde at gigahertz frequencies. Here we demonstrate nanometre-scale, layer-resolved detection of electromagnetic phase through the radio frequency magnetic field (H) over tilde (rf) in magnetic heterostructures. Time-resolved X-ray magnetic circular dichroism reveals the local phase of the radio frequency magnetic field acting on individual magnetizations (M) over tilde (i) through the susceptibility as (M) over tilde = (chi) over tilde(H) over tilde (rf). An unexpectedly large phase variation, similar to 40 degrees, is detected across spin-valve trilayers driven at 3 GHz. The results have implications for the identification of novel effects in spintronics and suggest general possibilities for electromagnetic-phase profile measurement in heterostructures.

Place, publisher, year, edition, pages
2013. Vol. 4, 2025- p.
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Natural Sciences
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URN: urn:nbn:se:uu:diva-208167DOI: 10.1038/ncomms3025ISI: 000323713000001OAI: oai:DiVA.org:uu-208167DiVA: diva2:651181
Available from: 2013-09-24 Created: 2013-09-24 Last updated: 2017-12-06Bibliographically approved

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Knut, RonnyKaris, Olof

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