CAJ | 학술논문

多铁性材料在磁相变温度附近的介电异常归因于系统中铁磁有序和弛豫铁电性的共存。本文基于Heisen-berg模型对铁磁子系统进行分析，使用最近邻自旋对关联表征磁子系统的磁有序程度。磁性质通过磁电耦合效应修正磁性离子因非中心位移而形成的极化簇的取向激活能，实现对介电性质的影响。外加磁场通过提高系统的磁有序程度而使得介电异常更为显著，磁相变温度附近的磁电容效应是磁场对介电性质影响的最好检验。
다철성재료재자상변온도부근적개전이상귀인우계통중철자유서화이예철전성적공존。본문기우Heisen-berg모형대철자자계통진행분석，사용최근린자선대관련표정자자계통적자유서정도。자성질통과자전우합효응수정자성리자인비중심위이이형성적겁화족적취향격활능，실현대개전성질적영향。외가자장통과제고계통적자유서정도이사득개전이상경위현저，자상변온도부근적자전용효응시자장대개전성질영향적최호검험。
In multiferroics CdCr2 S4 , the coexistence of ferromagnetic order and relaxor ferroelectricity of system leads to the dielectric anomaly around the magnetic phase transition temperature .Based on Heisenberg model, we analyze the ferromagnetic sub-system and give the nearest neighbour spin-pair correlation showing the degree of magnetic order .Through the magnetoelectric coupling, magnetic properties amend the activation energy of polar clusters orientation which comes from the off-center displace-ment of magnetic ions, the dielectric anomaly ensues.The external magnetic field makes the dielectric anomaly more obvious via the increasing degree of magnetic order.The magnetocapacitance effect around the magnetic phase transition temperature demon-strates the relation between magnetic field and dielectric poeperties .