巡游铁磁体SrRuO_3磁性的Preisach描述

A PREISACH APPROACH TO THE MAGNETIC PROPERTIES OF ITINERANT FERROMAGNET SrRuO_3

测量了巡游铁磁体SrRuO3的零场冷却(ZFC)和加场冷却(FC)的磁化强度随温度的变化关系,以及不同温度下的磁滞回线.考虑了热涨落和自由能壁垒随温度的变化,改进了Preisach模型并对测量数据进行了拟合.数值模拟再现了测量结果的变化规律,包括在不同温度下的磁滞回线和在不同外磁场下的ZFC和FC磁化强度曲线等.对拟合出的巴克豪森跳跃谱进行了讨论.

Zero field cooled (ZFC) and field cooled (FC) magnetization as a function of temperature of itinerant ferromagnet SrRuO3 has been measured experimentally, in a sequence of applied fields up to the coercive field, and also the major hysteresis loop at a sequence of temperatures which span the ordered phase. The data have been analysed within the framework of a generalized version of the Preisach model of hysteresis, which combines thermal fluctuations with the change of the free energy barriers below Tc. The numerical simulations replicate all of the principal structural systematics of the data, and yield details of the spectrum of Barhausen instabilities in this material.