Enhancement of spin-asymmetry by L21 -ordering in Co 2MnSi/Cr/Co2MnSi current-perpendicular-to-plane magnetoresistance devices

Y. Sakuraba, T. Iwase, K. Saito, S. Mitani, K. Takanashi

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60 Citations (Scopus)

Abstract

Co2 MnSi/Cr/ Co2 MnSi (001)-fully epitaxial current-perpendicular-to-plane giant magnetoresistance (CPP-GMR) devices were fabricated via an UHV magnetron sputtering system. The relationship between the degree of chemical ordering in Co2 MnSi (CMS) and the CPP-GMR characteristics was investigated systematically against the annealing temperature of the devices. X-ray diffraction profiles and reflection high-energy electron diffraction images indicated that annealing improved L 21 -ordering. The MR ratio also increased upon annealing and the maximum MR ratio of 5.2% and ΔRA of 6.5 m μ m2 were achieved by annealing at 400 °C. These results indicate that promoting the degree of L 21 -ordering in CMS enhances the bulk and/or interface spin-asymmetry coefficients.

Original languageEnglish
Article number012511
JournalApplied Physics Letters
Volume94
Issue number1
DOIs
Publication statusPublished - 2009

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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