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Article: Research on physics published by scientists at State University of New York.
- Article from:
- Nanotechnology Weekly
- Article date:
- November 2, 2009
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"The present study shows that antiferromagnetic spin and twin domain walls govern the hysteretic expressions of exchange anisotropy at low and high fields, respectively, using annealed NiO single crystals and Co. In the presence of twin walls, spin walls are shown to be a geometrical necessity in the antiferromagnetic NiO," scientists writing in the journal Physical Review B report.
"A threshold field (similar to 10 000 Oe) exists below which twin walls are frozen, and rotational hysteresis is dominated by losses due to spin walls. Above the threshold field, twin walls become mobile, resulting in a sharp increase in rotational hysteresis. Remarkably, rotational ...