Strain response of magnetic order in perovskite-type oxide films
Strain response of magnetic order in perovskite-type oxide films
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DOI：
10.1098/rsta.2012.0441
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发表时间：
2014-02
期刊：
影响因子：
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通讯作者：
A. Herklotz;M. Biegalski;H. Christen;Er‐Jia Guo;K. Nenkov;A. D. Rata;L. Schultz;K. Dörr
中科院分区：
文献类型：
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作者：
A. Herklotz;M. Biegalski;H. Christen;Er‐Jia Guo;K. Nenkov;A. D. Rata;L. Schultz;K. Dörr
弹性应变对于磁电材料和器件的作用是双重的。它可以在非铁性材料的薄膜中诱导铁性有序。另一方面，它提供了当今两相磁电材料和器件中最常用的耦合机制。复合氧化物薄膜（钙钛矿、尖晶石）对于这两种途径都有希望。复杂氧化物薄膜中磁有序的应变控制是一个年轻的研究领域，并且很少有可用于依赖于晶格参数和晶格对称性的磁有序的从头计算模拟。在这里，介绍了一种评估外延薄膜中的弹性应变如何改变其磁序的实验方法。磁性薄膜在由缓冲层控制的应变状态下外延生长到 0.72Pb(Mg1/3Nb2/3)O3–0.28PbTiO3(001) 压电基板上。作为一个例子，我们研究了 SrRuO3 有序磁矩的应变依赖性。在拉伸应变水平约为 1% 时，SrRuO3 呈四方晶系，双轴弹性应变会显着抑制有序磁矩。作为第二个例子，在外延 La0.8Sr0.2CoO3 薄膜中观察到从铁磁相到磁无序相的应变驱动转变。
The role of elastic strain for magnetoelectric materials and devices is twofold. It can induce ferroic orders in thin films of otherwise non-ferroic materials. On the other hand, it provides the most exploited coupling mechanism in two-phase magnetoelectric materials and devices today. Complex oxide films (perovskites, spinels) are promising for both routes. The strain control of magnetic order in complex oxide films is a young research field, and few ab initio simulations are available for magnetic order in dependence on lattice parameters and lattice symmetry. Here, an experimental approach for the evaluation of how elastic strain in thin epitaxial films alters their magnetic order is introduced. The magnetic films are grown epitaxially in strain states controlled by buffer layers onto piezoelectric substrates of 0.72Pb(Mg1/3Nb2/3)O3–0.28PbTiO3(001). As an example, the strain dependence of the ordered magnetic moment of SrRuO3 has been investigated. At a tensile strain level of approximately 1%, SrRuO3 is tetragonal, and biaxial elastic strain induces a pronounced suppression of the ordered magnetic moment. As a second example, a strain-driven transition from a ferromagnetic to a magnetically disordered phase has been observed in epitaxial La0.8Sr0.2CoO3 films.