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Distinctive Picosecond Spin Polarization Dynamics in Bulk Half Metals
Nanyang Technol Univ, Singapore; Tech Univ Wien, Austria.
Univ West Bohemia, Czech Republic.
Linköping University, Department of Physics, Chemistry and Biology, Semiconductor Materials. Linköping University, Faculty of Science & Engineering.
Univ Cergy Pontoise, France.
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2018 (English)In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 121, no 7, article id 077205Article in journal (Refereed) Published
Abstract [en]

Femtosecond laser excitations in half-metal (HM) compounds are theoretically predicted to induce an exotic picosecond spin dynamics. In particular, conversely to what is observed in conventional metals and semiconductors, the thermalization process in HMs leads to a long living partially thermalized configuration characterized by three Fermi-Dirac distributions for the minority, majority conduction, and majority valence electrons, respectively. Remarkably, these distributions have the same temperature but different chemical potentials. This unusual thermodynamic state is causing a persistent nonequilibrium spin polarization only well above the Fermi energy. Femtosecond spin dynamics experiments performed on Fe3O4 by time- and spin-resolved photoelectron spectroscopy support our model. Furthermore, the spin polarization response proves to be very robust and it can be adopted to selectively test the bulk HM character in a wide range of compounds.

Place, publisher, year, edition, pages
AMER PHYSICAL SOC , 2018. Vol. 121, no 7, article id 077205
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:liu:diva-150858DOI: 10.1103/PhysRevLett.121.077205ISI: 000442083800019PubMedID: 30169049OAI: oai:DiVA.org:liu-150858DiVA, id: diva2:1245904
Note

Funding Agencies|UK EPSRC Grant [GR/M50447]; STFC; FERMI FEL project; Austrian Science Fund (FWF) through Lise Meitner Grant [M1925-N28]; Nanyang Technological University, NAP-SUG; CEDAMNF [CZ 02.1.01/0.0/0.0/15_003/0000358]; ERDF

Available from: 2018-09-06 Created: 2018-09-06 Last updated: 2018-10-08

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