Enhanced blocking temperature in NiO spin valves: Role of cubic spinel ferrite layer between pinned layer and NiO

R. F C Farrow, M. J. Carey, R. F. Marks, P. M. Rice, David Smith

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

Abstract

We compare the blocking temperature for simple permalloy (80% Ni)/Au/permalloy/NiO spin valves with and without an interfacial, oxidized Fe layer (Fe layer 12 Å thick) inserted at the permalloy/NiO interface. We find a significantly increased blocking temperature and pinning field for spin valves with the interfacial Fe-oxide layer, as a result of moderate (230 °C/1 h) annealing of the Au/permalloy/Fe-oxide/NiO part of the spin valve. High resolution transmission electron microscopy and electron energy loss microanalysis reveal that the Fe-oxide layer is converted to a cubic spinel ferrite (Ni0.8Fe2.2O4) layer by solid state reaction with the NiO.

Original languageEnglish (US)
Pages (from-to)1191-1193
Number of pages3
JournalApplied Physics Letters
Volume77
Issue number8
DOIs
StatePublished - Aug 21 2000

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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