Battiato, M., Minar, J., Wang, W., Ndiaye, W., Richter, M. C., Heckmann, O., Mariot, J. -M., Parmigiani, F., Hricovini, K. and Cacho, C. (2018). Distinctive Picosecond Spin Polarization Dynamics in Bulk Half Metals. Phys. Rev. Lett., 121 (7). COLLEGE PK: AMER PHYSICAL SOC. ISSN 1079-7114

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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.

Item Type: Journal Article
Creators:
CreatorsEmailORCIDORCID Put Code
Battiato, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Minar, J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Wang, W.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Ndiaye, W.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Richter, M. C.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Heckmann, O.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Mariot, J. -M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Parmigiani, F.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Hricovini, K.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Cacho, C.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
URN: urn:nbn:de:hbz:38-176333
DOI: 10.1103/PhysRevLett.121.077205
Journal or Publication Title: Phys. Rev. Lett.
Volume: 121
Number: 7
Date: 2018
Publisher: AMER PHYSICAL SOC
Place of Publication: COLLEGE PK
ISSN: 1079-7114
Language: English
Faculty: Unspecified
Divisions: Unspecified
Subjects: no entry
Uncontrolled Keywords:
KeywordsLanguage
TRANSITIONMultiple languages
Physics, MultidisciplinaryMultiple languages
Refereed: Yes
URI: http://kups.ub.uni-koeln.de/id/eprint/17633

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