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Microscopic Model for Ultrafast Remagnetization Dynamics
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Applied Material Physics.ORCID iD: 0000-0003-4341-5663
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2012 (English)In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 109, no 15, 157201- p.Article in journal (Refereed) Published
Abstract [en]

In this Letter, we provide a microscopic model for the ultrafast remagnetization of atomic moments already quenched above the Stoner-Curie temperature by a strong laser fluence. Combining first-principles density functional theory, atomistic spin dynamics utilizing the Landau-Lifshitz-Gilbert equation, and a three-temperature model, we analyze the temporal evolution of atomic moments as well as the macroscopic magnetization of bcc Fe and hcp Co covering a broad time scale, ranging from femtoseconds to picoseconds. Our simulations show a variety of complex temporal behavior of the magnetic properties resulting from an interplay between electron, spin, and lattice subsystems, which causes an intricate time evolution of the atomic moment, where longitudinal and transversal fluctuations result in a macrospin moment that evolves highly nonmonotonically.

Place, publisher, year, edition, pages
2012. Vol. 109, no 15, 157201- p.
Keyword [en]
Transition-Metals, Spin Dynamics, Demagnetization, Magnetism, Electrons
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-105001DOI: 10.1103/PhysRevLett.109.157201ISI: 000309590300042Scopus ID: 2-s2.0-84867320886OAI: oai:DiVA.org:kth-105001DiVA: diva2:569995
Funder
Swedish Research CouncilKnut and Alice Wallenberg FoundationeSSENCE - An eScience CollaborationSwedish eā€Science Research Center
Note

QC 20121116

Available from: 2012-11-16 Created: 2012-11-15 Last updated: 2017-12-07Bibliographically approved

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Bergqvist, Lars

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