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

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

Research output: Contribution to journalArticle

69 Scopus citations

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.

Original languageEnglish (US)
Article number242509
JournalApplied Physics Letters
Volume92
Issue number24
DOIs
StatePublished - Jun 30 2008
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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