Magnetoresistance of Fe3O4/Au/Fe3O 4 and Fe3O4/Au/Fe spin-valve structures

Sebastiaan van Dijken*, Xavier Fain, Steven M. Watts, Kentaro Nakajima, J. M D Coey

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

20 Citations (Scopus)

Abstract

A detailed study of the in-plane magnetotransport properties of spin valves with one and two Fe3O4 electrodes is presented. Fe 3O4/Au/Fe3O4 spin valves exhibit a clear anisotropic magnetoresistance in small magnetic fields but no giant magnetoresistance (GMR). The absence of GMR in these structures is due to simultaneous magnetization reversal in the two Fe3O4 layers. By contrast, a negative GMR effect is measured on Fe3O 4/Au/Fe spin valves. The negative GMR is attributed to an electron spin scattering asymmetry at the Fe3O4/Au interface or an induced spin scattering asymmetry in the Au interfacial layers.

Original languageEnglish
Pages (from-to)322-326
Number of pages5
JournalJournal of Magnetism and Magnetic Materials
Volume280
Issue number2-3
DOIs
Publication statusPublished - Sep 2004
MoE publication typeA1 Journal article-refereed

Keywords

  • Magnetic spin valve
  • Magnetite
  • Magnetoresistance

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