多铁性Bi $_{0.9}$ Sm $_{0.1}$ FeO $_3$中由$f$ - $d$感生磁各向异性驱动的温度诱导相变
Temperature induced phase transition from cycloidal to collinear antiferromagnetism in multiferroic Bi$_{0.9}$Sm$_{0.1}$FeO$_3$ driven by $f$-$d$ induced magnetic anisotropy
摘要：
在多铁性BiFeO $_3$中，摆线反铁磁结构在室温下耦合到大的电极化，从而产生磁电功能，其可以在新颖的基于多铁性的器件中被利用。在本文中，我们证明，通过取代10%的铋离子的钐的室温摆线的周期性增加，并通过冷却到低于$\sim15$ K的磁性结构趋向于一个简单的G型反铁磁体，这是完全建立在1.5 K。我们表明，这种转变的结果从$f-d$交换耦合，这会导致局部各向异性的铁磁矩，破坏摆线顺序-结果的一般意义的非共线磁结构的稳定性，在存在多个磁性亚晶格。
英文摘要：
In multiferroic BiFeO$_3$ a cycloidal antiferromagnetic structure is coupled to a large electric polarization at room temperature, giving rise to magnetoelectric functionality that may be exploited in novel multiferroic-based devices. In this paper, we demonstrate that by substituting samarium for 10% of the bismuth ions the periodicity of the room temperature cycloid is increased, and by cooling below $\sim15$ K the magnetic structure tends towards a simple G-type antiferromagnet, which is fully established at 1.5 K. We show that this transition results from $f-d$ exchange coupling, which induces a local anisotropy on the iron magnetic moments that destroys the cycloidal order - a result of general significance regarding the stability of non-collinear magnetic structures in the presence of multiple magnetic sublattices.
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