Ultrafast generation of ferromagnetic order via laser-induced phase transformation in FeRh thin films

Ganping Ju, J. Hohlfeld, B. Bergman, R.J.M. Veerdonk, van de, O.N. Mryasov, J.Y. Kim, Xiaowei Wu, D. Weller, B. Koopmans

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

162 Citations (Scopus)
2 Downloads (Pure)

Abstract

It is demonstrated that ultrafast generation of ferromagnetic order can be achieved by driving a material from an antiferromagnetic to a ferromagnetic state using femtosecond optical pulses. Experimental proof is provided for chemically ordered FeRh thin films. A subpicosecond onset of induced ferromagnetism is followed by a slower increase over a period of about 30 ps when FeRh is excited above a threshold fluence. Both experiment and theory provide evidence that the underlying phase transformation is accompanied, but not driven, by a lattice expansion. The mechanism for the observed ultrafast magnetic transformation is identified to be the strong ferromagnetic exchange mediated via Rh moments induced by Fe spin fluctuations.
Original languageEnglish
Title of host publicationProceedings of the 49th Annual Conference on Magnetism and Magnetic Materials (MMM49), 7-11 November 2004, Jacksonville, Florida, U.S.A.
Pages197403-1/4
DOIs
Publication statusPublished - 2004
Event49th Annual Conference on Magnetism and Magnetic Materials (MMM 2004) - The Adam’s Mark Jacksonville, Jacksonville, United States
Duration: 7 Nov 200411 Nov 2004
Conference number: 49

Publication series

NamePhysical Review Letters
Volume93
ISSN (Print)0031-9007

Conference

Conference49th Annual Conference on Magnetism and Magnetic Materials (MMM 2004)
Abbreviated titleMMM 2004
CountryUnited States
CityJacksonville
Period7/11/0411/11/04

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