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Title: Distinctive picosecond spin polarization dynamics in bulk half metals
Authors: Battiato, Marco
Richter, M. C.
Mariot, J.-M
Minár, J.
Wang, W.
Ndiaye, W.
Heckmann, O.
Parmigiani, F.
Hricovini, K.
Cacho, C.
Keywords: Spin Polarization
Half Metals
Issue Date: 2018
Source: Battiato, M., Minár, J., Wang, W., Ndiaye, W., Richter, M. C., Heckmann, O., . . . Cacho, C. (2018). Distinctive picosecond spin polarization dynamics in bulk half metals. Physical Review Letters, 121(7), 077205-. doi:10.1103/PhysRevLett.121.077205
Series/Report no.: Physical Review Letters
Abstract: 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.
ISSN: 0031-9007
DOI: 10.1103/PhysRevLett.121.077205
Rights: © 2018 American Physical Society. This paper was published in Physical Review Letters and is made available as an electronic reprint (preprint) with permission of American Physical Society. The published version is available at: []. One print or electronic copy may be made for personal use only. Systematic or multiple reproduction, distribution to multiple locations via electronic or other means, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper is prohibited and is subject to penalties under law.
Fulltext Permission: open
Fulltext Availability: With Fulltext
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