Spin-filter spin-valve films with an ultrathin CoFe free layer

H. Fukuzawa, H. Iwasaki, Y. Kamiguchi, K. Koi, M. Sahashi

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

Abstract

The concept of spin-filter spin-valve (SFSV) films is reviewed. The dependence of the free layer structure on the spin-filter effect was investigated by using model films and two types of free layers were compared, a single CoFe layer and a conventional NiFe/Co free layer. At the same magnetic thickness of the free layer, the SFSV films with a CoFe free layer showed a larger magnetoresistance (MR) ratio than those with a NiFe/Co free layer. This is partly attributed to the thinner CoFe free layer thickness, which is due to the fact that the CoFe free layer has higher Bs than the NiFe/Co free layer. Moreover, SFSV films with a CoFe free layer still showed a larger MR ratio when the free layer thickness was the same. It suggests that other factors contribute to the high MR performance, such as the quality of the interface between a free layer and a high conductance layer. Film performance of MR 9% to 10%, ΔRs 1.5-2.0 Ω, Heac∼3 Oe, and λs5≤±0.5 ppm was obtained with a single CoFe free layer and synthetic antiferromagnetic pinned structure.

Original languageEnglish
Pages (from-to)5581-5584
Number of pages4
JournalJournal of Applied Physics
Volume89
Issue number10
DOIs
Publication statusPublished - 2001 May 15

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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