Spin-dependent CPP transport properties of semiconductive-oxide/ferromagnet multilayers

Y. Nozaki, Y. Maeda, K. Matsuyama

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Abstract

The spin-dependent CPP (current perpendicular to plane) transport properties in semiconductive-oxide(MOx)/ferromagnet multilayers consisting of CoPt/Co/MOx/Co/MOx/Co/CoPt, where M = Ti, Sn, were investigated by magneto-transport measurement. The XRD patterns reveal that the structures of sputtered MOx films are amorphous or nanocrystalline. The MR ratio of a TiOx-based multilayer (0.43%) was much smaller than that of a SnOx-based one (2.0%) at T = 77 K. As inferred from the shape of MR curves with a large saturation field above 4kOe, suppressed MR change in the TiOx-based multilayer is caused by the interlayer diffusion of Co atoms into the TiOx layer. The same behavior was not observed in the SnOx-based one. The MR ratio was reduced by half on increasing tSnO(x) from 4 to 8 nm. This decrease can be ascribed to the scattering of the spin-polarized electron in the SnOx layer.

Original languageEnglish
Pages (from-to)157-159
Number of pages3
JournalJournal of Magnetism and Magnetic Materials
Volume239
Issue number1-3
DOIs
Publication statusPublished - 2002 Feb 1
Externally publishedYes

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Keywords

  • CPP transport
  • Oxides
  • Spin dependent transport

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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