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Another view on Gilbert damping in two-dimensional ferromagnets
ITMO University, Saint Petersburg, Russia.
ITMO University, Saint Petersburg, Russia; Department of Physics and Astronomy, Uppsala University, Uppsala, Sweden.
Örebro University, School of Science and Technology. Department of Physics and Astronomy, Uppsala University, Uppsala, Sweden.
ITMO University, Saint Petersburg, Russia.
2018 (English)In: Scientific Reports, ISSN 2045-2322, E-ISSN 2045-2322, Vol. 8, article id 17148Article in journal (Refereed) Published
Abstract [en]

A keen interest towards technological implications of spin-orbit driven magnetization dynamics requests a proper theoretical description, especially in the context of a microscopic framework, to be developed. Indeed, magnetization dynamics is so far approached within Landau-Lifshitz-Gilbert equation which characterizes torques on magnetization on purely phenomenological grounds. Particularly, spin-orbit coupling does not respect spin conservation, leading thus to angular momentum transfer to lattice and damping as a result. This mechanism is accounted by the Gilbert damping torque which describes relaxation of the magnetization to equilibrium. In this study we work out a microscopic Kubo-Streda formula for the components of the Gilbert damping tensor and apply the elaborated formalism to a two-dimensional Rashba ferromagnet in the weak disorder limit. We show that an exact analytical expression corresponding to the Gilbert damping parameter manifests linear dependence on the scattering rate and retains the constant value up to room temperature when no vibrational degrees of freedom are present in the system. We argue that the methodology developed in this paper can be safely applied to bilayers made of non- and ferromagnetic metals, e.g., CoPt.

Place, publisher, year, edition, pages
Nature Publishing Group, 2018. Vol. 8, article id 17148
National Category
Metallurgy and Metallic Materials
Identifiers
URN: urn:nbn:se:oru:diva-70496DOI: 10.1038/s41598-018-35517-xISI: 000450766300006PubMedID: 30464318Scopus ID: 2-s2.0-85056969363OAI: oai:DiVA.org:oru-70496DiVA, id: diva2:1268320
Funder
Swedish Research CouncilSwedish Foundation for Strategic Research Knut and Alice Wallenberg Foundation
Note

Funding Agencies:

Russian Science Foundation  18-72-00058  17-12-01359 

eSSENCE 

Available from: 2018-12-05 Created: 2018-12-05 Last updated: 2018-12-05Bibliographically approved

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Eriksson, Olle

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