Anomalous temperature dependence of training effect in specular spin valve using ultrathin Cr2 O3 -nano-oxide layer with magnetoelectric effect

Kazuya Sawada, Naoki Shimomura, Masaaki Doi, Masashi Sahashi

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4 Citations (Scopus)

Abstract

Exchange bias from antiferromagnetic (AFM) oxides with a magnetoelectric (ME) effect has been studied for controlling ferromagnetic (FM) magnetizations by an applying electric field. However, thick ME oxides are needed for realizing the electrically controlled exchange biasing. Therefore, in this study the temperature dependencies of the training effect for the Cr2 O 3 -nano-oxide-layer (NOL) are investigated for confirming the ME effect of the Cr2 O3 -NOL. The anomalous temperature tendencies of system dependent constant for exchange bias and magnetoresistance (MR), κHex and κMR, were observed, which are probably originated from the ME effect of the Cr2 O3 -NOL because (1) these anomalous temperature tendencies could not be obtained in the CoO-NOL spin valve and (2) the κHex and κMR are defined as the strength of the coupling between FM and AFM spins. It is remarkable result for us to confirm the possibility of the ME effect from the ultrathin Cr2 O3 layer (less than 1 nm) because the ME effect was observed in only thick ME materials.

Original languageEnglish
Article number09D713
JournalJournal of Applied Physics
Volume107
Issue number9
DOIs
Publication statusPublished - 2010 May 1

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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