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Phys. Rev. Lett. 86, 5585 - 5588 (2001)

Determination of the Spin Polarization of Half-Metallic CrO2 by Point Contact Andreev Reflection

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Y. Ji1, G. J. Strijkers1, F. Y. Yang1, C. L. Chien1, J. M. Byers2, A. Anguelouch3, Gang Xiao3, and A. Gupta4
1Department of Physics and Astronomy, The Johns Hopkins University, Baltimore, Maryland 21218
2Naval Research Laboratory, Washington, D.C. 20375
3Department of Physics, Brown University, Providence, Rhode Island 02912
4IBM T. J. Watson Research Center, Yorktown Heights, New York 10598

Received 15 November 2000

Andreev reflection at a Pb/CrO2 point contact has been used to determine the spin polarization of single-crystal CrO2 films made by chemical vapor deposition. The spin polarization is found to be 0.96±0.01, which confirms that CrO2 is a half-metallic ferromagnet, as theoretically predicted.


©2001 The American Physical Society

URL: http://link.aps.org/doi/10.1103/PhysRevLett.86.5585
DOI: 10.1103/PhysRevLett.86.5585
PACS: 74.80.Fp, 75.30.-m, 75.70.-i

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