Beyond a phenomenological description of magnetostriction
Status PubMed-not-MEDLINE Language English Country Great Britain, England Media electronic
Document type Journal Article, Research Support, Non-U.S. Gov't
PubMed
29374151
PubMed Central
PMC5786062
DOI
10.1038/s41467-017-02730-7
PII: 10.1038/s41467-017-02730-7
Knihovny.cz E-resources
- Publication type
- Journal Article MeSH
- Research Support, Non-U.S. Gov't MeSH
Magnetostriction, the strain induced by a change in magnetization, is a universal effect in magnetic materials. Owing to the difficulty in unraveling its microscopic origin, it has been largely treated phenomenologically. Here, we show how the source of magnetostriction-the underlying magnetoelastic stress-can be separated in the time domain, opening the door for an atomistic understanding. X-ray and electron diffraction are used to separate the sub-picosecond spin and lattice responses of FePt nanoparticles. Following excitation with a 50-fs laser pulse, time-resolved X-ray diffraction demonstrates that magnetic order is lost within the nanoparticles with a time constant of 146 fs. Ultrafast electron diffraction reveals that this demagnetization is followed by an anisotropic, three-dimensional lattice motion. Analysis of the size, speed, and symmetry of the lattice motion, together with ab initio calculations accounting for the stresses due to electrons and phonons, allow us to reveal the magnetoelastic stress generated by demagnetization.
Brookhaven National Laboratory Upton NY 1193 USA
Center for Memory and Recording Research UC San Diego 9500 Gilman Drive La Jolla CA 92093 0401 USA
Department of Applied Physics Stanford University Stanford CA 94305 USA
Department of Physics and Astronomy Uppsala University P O Box 516 S 75120 Uppsala Sweden
Department of Physics Stanford University Stanford CA 94305 USA
Magnetic Materials Unit National Institute for Materials Science Tsukuba 305 0047 Japan
San Jose Research Center HGST a Western Digital Company 3403 Yerba Buena Road San Jose CA 95135 USA
Thomas J Watson Research Center 1101 Kitchawan Road Yorktown Heights NY 10598 USA
Van der Waals Zeeman Institute University of Amsterdam 1018XE Amsterdam The Netherlands
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Nonequilibrium sub-10 nm spin-wave soliton formation in FePt nanoparticles
Spin stress contribution to the lattice dynamics of FePt
