Spin polarization of amorphous CoFeB determined by point-contact Andreev reflection

S. X. Huang; T. Y. Chen; C. L. Chien

doi:10.1063/1.2949740

Spin polarization of amorphous CoFeB determined by point-contact Andreev reflection

S. X. Huang, T. Y. Chen, C. L. Chien

Arizona State University

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

100 Scopus citations

Abstract

Point-contact Andreev reflection measurements reveal that amorphous Co _x Fe_80-x B₂₀ (x=20, 40, and 60) alloys possess spin polarization of as much as 65%, much higher than the values of 43%-45% for Co and Fe. This accounts for the high magnetoresistance values in magnetic tunnel junctions incorporating amorphous CoFeB as the ferromagnetic electrodes. The crystallization of the amorphous alloys substantially reduces the spin polarization.

Original language	English (US)
Article number	242509
Journal	Applied Physics Letters
Volume	92
Issue number	24
DOIs	https://doi.org/10.1063/1.2949740
State	Published - 2008

ASJC Scopus subject areas

Physics and Astronomy (miscellaneous)

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10.1063/1.2949740

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title = "Spin polarization of amorphous CoFeB determined by point-contact Andreev reflection",

abstract = "Point-contact Andreev reflection measurements reveal that amorphous Co x Fe80-x B20 (x=20, 40, and 60) alloys possess spin polarization of as much as 65%, much higher than the values of 43%-45% for Co and Fe. This accounts for the high magnetoresistance values in magnetic tunnel junctions incorporating amorphous CoFeB as the ferromagnetic electrodes. The crystallization of the amorphous alloys substantially reduces the spin polarization.",

author = "Huang, {S. X.} and Chen, {T. Y.} and Chien, {C. L.}",

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N2 - Point-contact Andreev reflection measurements reveal that amorphous Co x Fe80-x B20 (x=20, 40, and 60) alloys possess spin polarization of as much as 65%, much higher than the values of 43%-45% for Co and Fe. This accounts for the high magnetoresistance values in magnetic tunnel junctions incorporating amorphous CoFeB as the ferromagnetic electrodes. The crystallization of the amorphous alloys substantially reduces the spin polarization.

AB - Point-contact Andreev reflection measurements reveal that amorphous Co x Fe80-x B20 (x=20, 40, and 60) alloys possess spin polarization of as much as 65%, much higher than the values of 43%-45% for Co and Fe. This accounts for the high magnetoresistance values in magnetic tunnel junctions incorporating amorphous CoFeB as the ferromagnetic electrodes. The crystallization of the amorphous alloys substantially reduces the spin polarization.

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Spin polarization of amorphous CoFeB determined by point-contact Andreev reflection

Abstract

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