Journal
AIMS MATERIALS SCIENCE
Volume 2, Issue 4, Pages 484-496Publisher
AMER INST MATHEMATICAL SCIENCES-AIMS
DOI: 10.3934/matersci.2015.4.484
Keywords
magnetic domain; antiferromagnet; exchange bias; focused soft X-ray; soft X-ray magnetic circular dichroism; soft X-ray absorption; microspectroscopy; fresnel zone plate
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Funding
- JASRI [2014A0079, 2014B0079, 2015A0079]
- JSPS KAKENHI [25706007]
- ImPACT program of Council for Science, Technology and Innovation (Cabinet Office, Government of Japan)
- Photonics Advanced Research Center (PARC) at Osaka University
- Grants-in-Aid for Scientific Research [25706007] Funding Source: KAKEN
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By using focused soft X-rays, magnetic domain imaging based on X-ray magnetic circular dichroism (XMCD) measurements was performed on a Pt/Co/Cr2O3/Pt film that exhibits both perpendicular magnetic anisotropy and perpendicular exchange anisotropy. In the AC-demagnetized state, spatial distributions of the XMCD corresponding to the magnetic domains were clearly observed. In particular, ferromagnetic and antiferromagnetic magnetic domains were separately observed by tuning the photon energy to either the ferromagnetic Co L-3 edge or the antiferromagnetic Cr L-3 edge. The ferromagnetic domain pattern is similar to the ones previously reported for Co/Pt multilayers, and the ferromagnetic and antiferromagnetic domains are spatially coupled. The magnetization curve measured after cooling the sample, while maintaining the demagnetized state, exhibited positive and negative exchange biases simultaneously, which suggests that the exchange bias is determined on a domain-by-domain basis.
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