两层钙钛矿磁体中自旋重取向诱导的磁电耦合效应
Spin-reorientation-induced magnetodielectric coupling effects in two layered perovskite magnets.
作者信息
Huang Bo, Zhang Jian-Yu, Huang Rui-Kang, Chen Ming-Kun, Xue Wei, Zhang Wei-Xiong, Zeng Ming-Hua, Chen Xiao-Ming
机构信息
MOE Key Laboratory of Bioinorganic and Synthetic Chemistry , School of Chemistry , Sun Yat-Sen University , Guangzhou , 510275 , P. R. China . Email:
School of Chemistry and Pharmaceutical Sciences , GuangXi Normal University , Guilin 541004 , P. R. China.
出版信息
Chem Sci. 2018 Aug 1;9(37):7413-7418. doi: 10.1039/c8sc02917b. eCollection 2018 Oct 7.
Spin-reorientation-induced magnetodielectric coupling effects were discovered in two layered perovskite magnets, [CHCHCHNH][MCl] (M = Mn and Cu), isothermal magnetodielectric measurements on single-crystal samples. Specifically, peak-like dielectric anomalies and spin-flop transitions appeared simultaneously at around ±34 kOe for the canted antiferromagnet (M = Mn) at below 44.3 K, while a low-field (1 kOe) controlled magnetodielectric effect was observed in the "soft" ferromagnet (M = Cu) at below 9.5 K. These isothermal magnetodielectric effects are highly reproducible and synchronous with the field-induced magnetization at different temperatures, well confirming the essential role of spin reorientation on inducing magnetodielectric coupling effects. These findings strongly imply that the layered perovskite magnets are new promising organic-inorganic hybrid systems to host magnetodielectric coupling effects.
在两层钙钛矿磁体[CHCHCHNH][MCl]（M = Mn和Cu）的单晶样品的等温磁电测量中发现了自旋重取向诱导的磁电耦合效应。具体而言，对于倾斜反铁磁体（M = Mn），在低于44.3 K时，在±34 kOe左右同时出现了峰状介电异常和自旋翻转转变，而在低于9.5 K时，在“软”铁磁体（M = Cu）中观察到了低场（1 kOe）控制的磁电效应。这些等温磁电效应具有高度可重复性，并且在不同温度下与场致磁化同步，很好地证实了自旋重取向在诱导磁电耦合效应中的重要作用。这些发现强烈表明，层状钙钛矿磁体是承载磁电耦合效应的新型有前途的有机-无机杂化体系。
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