Evidence for preferential rearrangements of martensite variants by magnetic field in antiferromagnetic CoO crystal

Nie, Z. H.; Ren, Y.; Terai, T.; Wang, Y. D.; Brown, D. E.; Kakeshita, T.
August 2009
Applied Physics Letters;8/3/2009, Vol. 95 Issue 5, p051914
Academic Journal
The synchrotron high-energy x-ray diffraction provides the direct crystallographic evidence for the magnetic-field-driven preferential rearrangements of martensite multivariants in antiferromagnetic CoO crystal. When a magnetic field was incrementally applied up to 6 T on the CoO single crystal cooled below the Néel temperature, the martensite variants with the magnetization easy-axis parallel to the magnetic field direction (Hvector ) were consumed, while the variants with magnetic moments perpendicular to Hvector were enhanced. The microscopic origin for the observation is discussed, which provides important information for understanding the magnetic-field-driven strain observed in the antiferromagnetic alloys, with a selection principle on martensite variants different from that found in the ferromagnetic shape memory alloys.


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