Role of tunneling matrix elements in determining the magnitude of the tunneling spin polarization of 3d transition metal ferromagnetic alloys

Christian Kaiser*, Sebastiaan van Dijken, See-Hun Yang, Hyunsoo Yang, Stuart S P Parkin

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

39 Citations (Scopus)

Abstract

We have measured the tunneling spin polarization and associated tunneling magnetoresistance for Co-Pt and Co-V alloys using Al2O3 and AlN barriers. These properties are insensitive to the Pt content of Co-Pt alloys for up to 40 at.% Pt, whereas the spin polarization of Co-V alloys decreases significantly with the addition of small amounts of V. We attribute these different behaviors to the relative strengths of bonds formed between the alloy constituents and oxygen in the Al2O3 tunnel barrier, which thereby influence the corresponding tunneling rates. The results for AlN barriers are consistent with this argument.

Original languageEnglish
Article number247203
Number of pages4
JournalPhysical Review Letters
Volume94
Issue number24
DOIs
Publication statusPublished - 24 Jun 2005
MoE publication typeA1 Journal article-refereed

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