CPP-GMR films with a current-confined-path nano-oxide layer (CCP-NOL)

Hideaki Fukuzawa, Hiromi Yuasa, Hitoshi Iwasaki

Research output: Contribution to journalArticle

27 Citations (Scopus)

Abstract

We investigated the film performance and nanostructure of current-perpendicular-to-plane giant magnetoresistance (CPP-GMR) spin-valve film with a current-confined-path nano-oxide layer (CCP-NOL). By applying ion-assisted oxidation (IAO) for the CCP-NOL formation, we enhanced the MR ratio to 5.4% at a small RA value of 500 mΩ νm2 for conventional Co90Fe10 layers. Furthermore, the use of bcc-Fe 50Co50 also increased the MR ratio to 8.2% at a small RA value of 580 mΩ νm2. A modified Valet-Fert model for the CCP-NOL showed that the MR enhancement by the IAO is due to the improvement in resistivity of the CCP, and that by Fe50Co50 is due to a larger spin-dependent interface scattering effect. Analysis by cross-sectional TEM and three-dimensional atom probe confirmed the formation of the CCP-NOL structure. A reliability test for test element devices showed almost no change even under acceleration stress. The CPP-GMR spin-valve film with the CCP-NOL is extendable to future high-density recording heads due to its potential for a higher MR ratio at a small value of RA.

Original languageEnglish
Article numberS01
Pages (from-to)1213-1220
Number of pages8
JournalJournal of Physics D: Applied Physics
Volume40
Issue number5
DOIs
Publication statusPublished - Mar 7 2007
Externally publishedYes

Fingerprint

Giant magnetoresistance
Oxides
oxides
Ions
Oxidation
recording heads
oxidation
Nanostructures
Scattering
Transmission electron microscopy
Atoms
ions
transmission electron microscopy
electrical resistivity
augmentation
probes
scattering

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

Cite this

CPP-GMR films with a current-confined-path nano-oxide layer (CCP-NOL). / Fukuzawa, Hideaki; Yuasa, Hiromi; Iwasaki, Hitoshi.

In: Journal of Physics D: Applied Physics, Vol. 40, No. 5, S01, 07.03.2007, p. 1213-1220.

Research output: Contribution to journalArticle

Fukuzawa, Hideaki ; Yuasa, Hiromi ; Iwasaki, Hitoshi. / CPP-GMR films with a current-confined-path nano-oxide layer (CCP-NOL). In: Journal of Physics D: Applied Physics. 2007 ; Vol. 40, No. 5. pp. 1213-1220.
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