arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2106.01152cond-mat.mtrl-sci
收藏

单晶La2-xAxCoMnO6(A = Ca,Sr)化合物中零场冷却交换偏置效应的消失

Absence of zero-field-cooled exchange bias effect in single crystalline La2-xAxCoMnO6 (A = Ca, Sr) compounds

C. Macchiutti, J. R. Jesus, F. B. Carneiro, L. Bufaiçal, M. Ciomaga Hatnean, G. Balakrishnan, E. M. Bittar

摘要:

A_2BB 'O_6(A =稀土或碱土金属离子; B,B' =过渡金属离子)双钙钛矿的磁性由于其潜在的自旋电子学应用而引起人们极大的兴趣。特别吸引人的是零场冷却交换偏置(ZEB)的效果观察到的空穴掺杂的La 2-xAxCoMnO 6多晶样品。本文采用浮区法合成了La_2CoMnO_6、La_(1.5)Ca_(0.5)CoMnO_6和La_(1.5)Sr_(0.5)CoMnO_6单晶,并对其磁性进行了研究。这三种材料都是铁磁性的。令人惊讶的是,我们观察到没有零,甚至传统的交换偏置效应的Ca和Sr掺杂的单晶,形成鲜明对比的多晶样品。这种缺失表明,在我们的样品中没有观察到的晶界和类似自旋玻璃的行为的缺乏可能是多晶样品中观察到的自发交换偏置现象的关键成分。

英文摘要:

Magnetic properties of A2BB'O6 (A = rare or alkaline earth ions; B,B' = transition metal ions) double perovskites are of great interest due to their potential spintronic applications. Particularly fascinating is the zero field cooled exchange bias (ZEB) effect observed for the hole doped La2-xAxCoMnO6 polycrystalline samples. In this work we synthesize La2CoMnO6, La1.5Ca0.5CoMnO6, and La1.5Sr0.5CoMnO6 single crystals by the floating zone method and study their magnetic behavior. The three materials are ferromagnetic. Surprisingly, we observe no zero or even conventional exchange bias effect for the Ca and Sr doped single crystals, in sharp contrast to polycrystalline samples. This absence indicates that the lack of grain boundaries and spin glass-like behavior, not observed in our samples, might be key ingredients for the spontaneous exchange bias phenomena seen in polycrystalline samples.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑