论文部分内容阅读
通过光学浮区法生长了直径为6mm,长度约为75mm的晶体,结构分析表明实验样品呈单相的正交钙钛矿结构,并通过劳厄定向仪对ErFeO3晶体进行了定向.系统测量了ErFeO3晶体a,c方向的热磁曲线和不同温度下的磁化曲线.结果表明,随着温度的降低,在98～86K范围该体系经历了从Г4(Gx,Fz)相到Г2(Gz,Fx)相的自旋重取向转变.在ErFeO3体系中,由于Er离子磁矩反平行于Fe离子磁矩分子场,在46K附近,在a方向上Er的反向磁矩大于Fe离子磁矩,导致出现负磁化和磁化补偿点现象.随着外加测量场的增强,a轴向上的负磁化被抑制,补偿温度点向高温移动.
The crystal of 6mm in diameter and 75mm in length was grown by optical floatation method. The structural analysis showed that the experimental sample was a single-phase orthorhombic perovskite structure and the ErFeO3 crystal was oriented by Laue directional analyzer. The results show that the system undergoes the transition from Г4 (Gx, Fz) phase to Г2 (Gz, Fx) in the range of 98-86K with the decrease of temperature, and the magnetization curve of ErFeO3 crystal in the direction of a and c. ) Phase.In the ErFeO3 system, since the magnetic moment of Er ion is antiparallel to the magnetic moment field of Fe ion, the reverse magnetic moment of Er in a direction is larger than that of Fe ion at around 46K, resulting in Negative magnetization and magnetization compensation point appear phenomenon.With the increase of external measurement field, a negative axial magnetization is suppressed, compensating the temperature to move to high temperature.