Abstract
The temperature dependence of ihe coercive field was measured on low-temperature phase MnBi single crystals between room-temperature and the Curie point. The wall-nucleation field H <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">n</inf> increases more than one order of magnitude over this temperature range and values for H <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">n</inf> as high at 6-10 kOe were observed. This dependence of H <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">n</inf> on temperature is reversible with thermal cycling and the transition from a wall-motion-type hysteresis to a nucleation-type hysteresis is attributed to a temperature-dependent concentration of defects in the material. The results are compared with recent work on polycrystalline MnBi thin films and single crystal platelets.
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