Measurement of the transport spin polarization of FeV using point-contact Andreev reflection

M. S. Osofsky; L. Cheng; W. E. Bailey; K. Bussmann; D. Parker

doi:10.1063/1.4808209

Measurement of the transport spin polarization of FeV using point-contact Andreev reflection

M. S. Osofsky, L. Cheng, W. E. Bailey, K. Bussmann, D. Parker

Materials Theory

Research output: Contribution to journal › Article › peer-review

5 Scopus citations

Abstract

The Fe_1-xV_x alloy system exhibits the lowest known Gilbert relaxation rate of any ferromagnetic metal or binary alloy with G = 35 MHz at x = 27% V. Low relaxation rates are of particular interest in modern spin electronic applications involving spin torque. The transport spin polarization of a series of sputtered epitaxial Fe_1-xV_x samples was measured using point contact Andreev reflection. Values of the transport spin polarization agree well with those measured for pure Fe and are independent of composition. The results indicate that the substitution of up to 50% of V for Fe does not reduce the spin polarization in the alloy.

Original language	English
Article number	212412
Journal	Applied Physics Letters
Volume	102
Issue number	21
DOIs	https://doi.org/10.1063/1.4808209
State	Published - May 27 2013

Funding

The authors wish to acknowledge I. Mazin for discussions on the LAPW calculation and for providing the PCAR fitting routine. We also acknowledge K. Jensen for modifying the fitting routine. W.E.B. acknowledges the National Science Foundation (Grant No. U.S. NSF-ECCS-0925829) and the Army Research Office (Grant No. DAW911NF-07-1-0326) for support. D.P. acknowledges the financial support of the ORNL LDRD SEED program project S12-006, “Rare-Earth-Free Magnets: Compute, Create, Characterize”.

Funders	Funder number
NSF-ECCS-0925829
ORNL LDRD	S12-006
National Science Foundation
Army Research Office	DAW911NF-07-1-0326

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abstract = "The Fe1-xVx alloy system exhibits the lowest known Gilbert relaxation rate of any ferromagnetic metal or binary alloy with G = 35 MHz at x = 27% V. Low relaxation rates are of particular interest in modern spin electronic applications involving spin torque. The transport spin polarization of a series of sputtered epitaxial Fe1-xVx samples was measured using point contact Andreev reflection. Values of the transport spin polarization agree well with those measured for pure Fe and are independent of composition. The results indicate that the substitution of up to 50% of V for Fe does not reduce the spin polarization in the alloy.",

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AU - Osofsky, M. S.

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AU - Bailey, W. E.

AU - Bussmann, K.

AU - Parker, D.

PY - 2013/5/27

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AB - The Fe1-xVx alloy system exhibits the lowest known Gilbert relaxation rate of any ferromagnetic metal or binary alloy with G = 35 MHz at x = 27% V. Low relaxation rates are of particular interest in modern spin electronic applications involving spin torque. The transport spin polarization of a series of sputtered epitaxial Fe1-xVx samples was measured using point contact Andreev reflection. Values of the transport spin polarization agree well with those measured for pure Fe and are independent of composition. The results indicate that the substitution of up to 50% of V for Fe does not reduce the spin polarization in the alloy.

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Measurement of the transport spin polarization of FeV using point-contact Andreev reflection

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