首页> 外文OA文献 >Magneto-orbital helices as a route to coupling magnetism and ferroelectricity in multiferroic CaMn₇O₁₂.
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Magneto-orbital helices as a route to coupling magnetism and ferroelectricity in multiferroic CaMn₇O₁₂.

机译:磁轨道螺旋是在多铁性CaMn 3 O 12中耦合磁性和铁电的一种途径。

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摘要

Orbital physics drives a rich phenomenology in transition-metal oxides, providing the microscopic underpinning for effects such as Colossal Magnetoresistance. In particular, magnetic and lattice degrees of freedom are coupled through orbital ordering, and it has long been hoped that this coupling could be exploited to create high-temperature multiferroics with large values of the electrical polarization. Here we report an unprecedented magneto-orbital texture in multiferroic CaMn(7)O(12), found to give rise to the largest magnetically induced ferroelectric polarization measured to date. X-ray diffraction characterization of the structural modulation in these 'magneto-orbital helices', and analysis of magnetic exchange shows that orbital order is crucial in stabilising a chiral magnetic structure, thus allowing for electric polarization. Additionally, the presence of a global structural rotation enables the coupling between this polarization and magnetic helicity required for multiferroicity. These novel principles open up the possibility of discovering new multiferroics with even larger polarization and higher transition temperatures.
机译:轨道物理学推动了过渡金属氧化物的丰富现象学,为诸如巨磁阻等效应提供了微观基础。特别地,磁自由度和晶格自由度通过轨道排序耦合,并且长期以来一直希望可以利用这种耦合来创建具有大电极化值的高温多铁氧体。在这里,我们报告在多铁性CaMn(7)O(12)中出现了前所未有的磁轨道织构,发现该铁磁引起了迄今为止测量到的最大的磁感应铁电极化。这些“磁轨道螺旋”中的结构调制的X射线衍射特征以及对磁交换的分析表明,轨道顺序对于稳定手性磁结构至关重要,因此可以实现极化。另外,整体结构旋转的存在使得该极化和多铁性所需的磁螺旋之间的耦合成为可能。这些新颖的原理为发现具有更大极化和更高转变温度的新型多铁性化合物提供了可能性。

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