Journal
NATURE MATERIALS
Volume 8, Issue 1, Pages 56-61Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/NMAT2341
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Funding
- Deutsche Forschungsgemeinschaft [SPP 1133, SFB 602]
- NSF
- ONR
- NSF MRSEC
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Knowledge of the spin polarization is of fundamental importance for the use of a material in spintronics applications. Here, we used femtosecond optical excitation of half-metals to distinguish between half-metallic and metallic properties. Because the direct energy transfer by Elliot-Yafet scattering is blocked in a half-metal, the demagnetization time is a measure for the degree of half-metallicity. We propose that this characteristic enables us vice versa to establish a novel and fast characterization tool for this highly important material class used in spin-electronic devices. The technique has been applied to a variety of materials where the spin polarization at the Fermi level ranges from 45 to 98%: Ni, Co2MnSi, Fe3O4, La0.66Sr0.33MnO3 and CrO2.
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