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Anisotropic magnetization relaxation in ferromagnetic multilayers with variable interlayer exchange coupling
KTH, School of Engineering Sciences (SCI), Applied Physics, Nanostructure Physics. National Academy of Sciences of Ukraine, Ukraine.
KTH, School of Engineering Sciences (SCI), Applied Physics, Nanostructure Physics. National Academy of Sciences of Ukraine, Ukraine.ORCID iD: 0000-0001-5028-8928
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2016 (English)In: PHYSICAL REVIEW B, ISSN 2469-9950, Vol. 94, no 6, 064429Article in journal (Refereed) Published
Abstract [en]

The ferromagnetic resonance (FMR) linewidth and its anisotropy in F-1/f/F-2/AF multilayers, where spacer f has a low Curie point compared to the strongly ferromagnetic F-1 and F-2, is investigated. The role of the interlayer exchange coupling in magnetization relaxation is determined experimentally by varying the thickness of the spacer. It is shown that stronger interlayer coupling via thinner spacers enhances the microwave energy exchange between the outer ferromagnetic layers, with themagnetization of F-2 exchange dragged by the resonance precession in F-1. A weaker mirror effect is also observed: the magnetization of F-1 can be exchange dragged by the precession in F-2, which leads to antidamping and narrower FMR linewidths. A theory is developed to model the measured data, which allows separating various contributions to the magnetic relaxation in the system. Key physical parameters, such as the interlayer coupling constant, in-plane anisotropy of the FMR linewidth, and dispersion of the magnetic anisotropy fields, are quantified. These results should be useful for designing high-speed magnetic nanodevices based on thermally assisted switching.

Place, publisher, year, edition, pages
American Physical Society , 2016. Vol. 94, no 6, 064429
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:kth:diva-192725DOI: 10.1103/PhysRevB.94.064429ISI: 000381999000004Scopus ID: 2-s2.0-84985945533OAI: oai:DiVA.org:kth-192725DiVA: diva2:974438
Note

QC 20160926

Available from: 2016-09-26 Created: 2016-09-20 Last updated: 2016-09-26Bibliographically approved

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Kravets, A. F.Polishchuk, Dmytro M.Korenivski, Vladislav
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