Structure and transport properties of current-perpendicular-to-plane spin valves using Co2FeAl0.5Si0.5 and Co 2MnSi Heusler alloy electrodes

T. Furubayashi, K. Kodama, T. M. Nakatani, H. Sukegawa, Y. K. Takahashi, K. Inomata, K. Hono

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22 Citations (Scopus)

Abstract

We report the structure and transport properties of current-perpendicular- to-plane spin valves (CPP SVs) with Co2FeAl0.5Si 0.5 (CFAS) or Co2 MnSi (CMS) Heusler alloy magnetic layers and an Ag or Cu spacer layer. A multilayer stack of sub/Cr/Ag/Heusler/(Ag or Cu)/ Heusler/Co75Fe25/Ir22Mn78/Ru was deposited on a MgO(001) single crystalline substrate by magnetron sputtering. Transmission electron microscopy observations showed epitaxial growth from the substrate to the top Heusler layer. The CPP SV with a CFAS/Ag/CFAS trilayer showed relatively large magnetoresistance (MR) ratios of 12% at room temperature and 31% at 12 K, with monotonous temperature dependence. However, the MR values of the SV with the CMS/Ag/CMS trilayer showed a different temperature dependence with a maximum value of 22% at 100 K. This might be related to the 90° couplings between the two CMS layers.

Original languageEnglish
Article number113917
JournalJournal of Applied Physics
Volume107
Issue number11
DOIs
Publication statusPublished - 2010 Jun 1
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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