MATERIALS TRANSACTIONS
Online ISSN : 1347-5320
Print ISSN : 1345-9678
High Temperature In-situ Observations of Magnetic Domains in Fe-Co Alloys
Koichi KawaharaDaisuke IemuraSadahiro TsurekawaTadao Watanabe
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2003 Volume 44 Issue 12 Pages 2570-2577

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Abstract

In-situ observations of magnetic domain structure in Fe-Co alloys with Co concentrations of 4.6∼50 at% were made by the optical Kerr microscopy in the temperature range from R.T. to the Curie temperature (1103 K ∼ 1253 K). The magnetic domain structures could be successively observed up to the Curie temperature (1103 K ∼ 1253 K) and the average domain width was found to increase with increasing temperature. The contrast of magnetic domains in an Fe-4.6 at%Co alloy gradually decreased with increasing temperature and disappeared near the Curie temperature (1103 K). On the other hand, the magnetic domain structure in an Fe-50 at%Co alloy could be clearly observed at immediately below the α/γ phase transformation temperature (1253 K). Furthermore, it was found that the magnetic domain walls tended to orient perpendicularly to the α/γ interphase boundaries in an Fe-50 at%Co alloy at the α/γ phase transformation temperature.

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© 2003 The Japan Institute of Metals and Materials
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