Pressure-induced enhancement of giant magnetoresistance due to crossover of interlayer exchange coupling in Fe/Cr multilayers

K. Suenaga, S. Higashihara, M. Ohashi, G. Oomi, M. Hedo, Y. Uwatoko, K. Saito, S. Mitani, K. Takanashi

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16 Citations (Scopus)

Abstract

We report the first observation of a large pressure-induced enhancement of giant magnetoresistance (GMR) in magnetic multilayers (MML). In Fe/Cr MMLs with the Cr layer thickness of ∼30, a crossover from biquadratic to bilinear interlayer exchange coupling (IEC) was observed by applying pressure, and simultaneously the GMR under high pressure (>2GPa) was enhanced to be twice as large as that at ambient pressure. The enhanced GMR is attributed to the suppression of the biquadratic IEC by applying pressure, and the electrical resistivity in parallel alignment of magnetization also showed a crossover behavior, suggesting an electronic origin for the observed pressure effects.

Original languageEnglish
Article number207202
JournalPhysical Review Letters
Volume98
Issue number20
DOIs
Publication statusPublished - 2007 May 16

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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