Kim M K, Moon J Y, Oh S H, Oh D G, Choi Y J, Lee N
Department of Physics, Yonsei University, Seoul, 03722, Korea.
Sci Rep. 2019 Apr 1;9(1):5456. doi: 10.1038/s41598-019-41990-9.
Exploring new magnetic materials is essential for finding advantageous functional properties such as magnetoresistance, magnetocaloric effect, spintronic functionality, and multiferroicity. Versatile classes of double perovskite compounds have been recently investigated because of intriguing physical properties arising from the proper combination of several magnetic ions. In this study, it is observed that the dominant ferrimagnetic phase is coexisted with a minor multiferroic phase in single-crystalline double-perovskite ErCoMnO. The majority portion of the ferrimagnetic order is activated by the long-range order of Er moments below T = 10 K in addition to the ferromagnetic order of Co and Mn moments arising at T = 67 K, characterized by compensated magnetization at T = 3.15 K. The inverted magnetic hysteresis loop observed below T can be described by an extended Stoner-Wohlfarth model. The additional multiferroic phase is identified by the ferroelectric polarization of ~0.9 μC/m at 2 K. The coexisting ferrimagnetic and multiferroic phases appear to be strongly correlated in that metamagnetic and ferroelectric transitions occur simultaneously. The results based on intricate magnetic correlations and phases in ErCoMnO enrich fundamental and applied research on magnetic materials through the scope of distinct magnetic characteristics in double perovskites.
探索新型磁性材料对于发现诸如磁电阻、磁热效应、自旋电子功能和多铁性等有利的功能特性至关重要。由于几种磁性离子的适当组合产生了引人入胜的物理性质，最近对多种类型的双钙钛矿化合物进行了研究。在本研究中，观察到在单晶双钙钛矿ErCoMnO中，主导的亚铁磁相与少量的多铁性相共存。亚铁磁序的大部分是由低于T = 10 K时Er磁矩的长程有序激活的，此外还有在T = 67 K时Co和Mn磁矩产生的铁磁序，其特征是在T = 3.15 K时出现补偿磁化。在T以下观察到的反向磁滞回线可以用扩展的斯托纳-沃尔法特模型来描述。额外的多铁性相通过在2 K时约0.9 μC/m的铁电极化来识别。共存的亚铁磁相和多铁性相似乎具有很强的相关性，因为变磁和铁电转变同时发生。基于ErCoMnO中复杂的磁相关性和相的结果，通过双钙钛矿中独特的磁特性范围，丰富了磁性材料的基础研究和应用研究。
