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2Â¥2010-01-17 19:53:08
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Fig. 7 shows the M¨CH hysteresis loops of YMnO3 ceramics at different temperatures. Above 40 K, no magnetic hysteresis loops are detected in the magnetic-ordered temperature range, suggesting the antiferromagnetic nature of YMnO3. In addition, an obvious magnetic hysteresis loop is observed at 25 K, with remnant magnetization (Mr) of 0.24 emu/g and a coercive field It indicates a weak ferromagnetic characteristic, in good agreement with the susceptibility measurement results. This differs from the previous magnetism studies of YMnO3, which showed that spontaneous magnetization and hysteresis phenomenon all vanish below TN [5]. |
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