Giant magnetoresistance effect and magnetic anisotropy in Co9Fe{plus 45 degree rule}Cu{plus 45 degree rule}Co9Fe trilayers on MgO(110) substrates

K. Inomata, Yoshiaki Saito, R. J. Highmore

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7 Citations (Scopus)

Abstract

Magnetoresistive properties were investigated for Co9Fe/Cu/Co9Fe trilayers with a 21 Å Cu layer thickness and different Co9Fe layer thickness which were prepared on MgO(110) substrates using ion beam sputter deposition. The influence of a 50 Å Fe buffer was also investigated. The films grew with epitaxial relations of MgO(110) [110] {norm of matrix} Co9Fe(110)[110] and MgO(110)[110] {norm of matrix} bccFe(211)[111] {norm of matrix} Co9Fe(110)[110] without and with a Fe buffer layer, respectively. In-plane uniaxial magnetic anisotropy (Ku) in addition to cubic anisotropy (K1) was induced, of which the easy axis was along MgO[001] and MgO[110] without and with a 50 Å Fe buffer layer, respectively. The magnetoresistance (MR) ratio decreased monotonically with increasing Co9Fe layer thickness in the investigated thickness range, 25-70 Å. The maximum value obtained was 11.5% at room temperature. With increasing field the MR saturated with a gentle slope after a steep drop at a small field without a Fe buffer layer, but rapidly saturated at a small field with a Fe buffer. These behaviours can be understood by magnetization processes taking into account both Ku and K1.

Original languageEnglish
Pages (from-to)257-263
Number of pages7
JournalJournal of Magnetism and Magnetic Materials
Volume137
Issue number3
DOIs
Publication statusPublished - 1994 Nov 1
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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