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Low Field Magnetic and Thermal Hysteresis in Antiferromagnetic Dysprosium

机译：反铁磁性s的低场磁滞和热滞后

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Magnetic and thermal hysteresis (difference in magnetic properties on cooling and heating) have been studied in polycrystalline Dy (dysprosium) between 80 and 250 K using measurements of the reversible Villari effect and alternating current (AC) susceptibility. We argue that measurement of the reversible Villari effect in the antiferromagnetic phase is a more sensitive method to detect magnetic hysteresis than the registration of conventional B ( H ) loops. We found that the Villari point, recently reported in the antiferromagnetic phase of Dy at 166 K, controls the essential features of magnetic hysteresis and AC susceptibility on heating from the ferromagnetic state: (i) thermal hysteresis in AC susceptibility and in the reversible Villari effect disappears abruptly at the temperature of the Villari point; (ii) the imaginary part of AC susceptibility is strongly frequency dependent, but only up to the temperature of the Villari point; (iii) the imaginary part of the susceptibility drops sharply also at the Villari point. We attribute these effects observed at the Villari point to the disappearance of the residual ferromagnetic phase. The strong influence of the Villari point on several magnetic properties allows this temperature to be ranked almost as important as the Curie and Néel temperatures in Dy and likely also for other rare earth elements and their alloys.
机译：使用可逆维拉里效应和交流电（AC）磁化率的测量，研究了多晶Dy（K）在80至250 K之间的磁和热磁滞（冷却和加热时磁性能的差异）。我们认为，反铁磁相中可逆比利亚里效应的测量比常规B（H）环的配准是检测磁滞的更灵敏的方法。我们发现，最近在DY的反铁磁相中以166 K报道的比利亚里点控制着铁磁态加热时的磁滞和交流磁化率的基本特征：（i）交流磁化率中的热磁滞和可逆的比利亚里效应在比利亚里点的温度下突然消失; （ii）交流磁化率的虚部在很大程度上取决于频率，但仅在比利亚里点的温度以下; （iii）磁化率的虚部在比利亚里点也急剧下降。我们将在比利亚里点观察到的这些影响归因于残余铁磁相的消失。维拉里点对几种磁性的强烈影响使该温度几乎与Dy的居里和Néel温度一样重要，并且可能对其他稀土元素及其合金也是如此。

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