Moreno Roberto, Jenkins Sarah, Skeparovski Aleksandar, Nedelkoski Zlatko, Gerber Alexander, Lazarov Vlado K, Evans Richard F L
Department of Physics, University of York, Heslington, York, YO10 5DD, United Kingdom.
Earth and Planetary Science, School of Geosciences, University of Edinburgh, Edinburgh EH9 3FE, United Kingdom.
J Phys Condens Matter. 2021 Apr 23;33(17). doi: 10.1088/1361-648X/abe26c.
Anti-phase boundaries (APBs) are structural defects which have been shown to be responsible for the anomalous magnetic behavior observed in different nanostructures. Understanding their properties is crucial in order to use them to tune the properties of magnetic materials by growing APBs in a controlled way since their density strongly depends on the synthesis method. In this work we investigate their influence on magnetite (FeO) thin films by considering an atomistic spin model, focussing our study on the role that the exchange interactions play across the APB interface. We conclude that the main atypical features reported experimentally in this material are well described by the model we propose here, confirming the new exchange interactions created in the APB as the responsible for this deviation from bulk properties.
反相边界（APB）是一种结构缺陷，已被证明是导致在不同纳米结构中观察到异常磁行为的原因。了解它们的性质对于通过以可控方式生长APB来调节磁性材料的性质至关重要，因为它们的密度强烈依赖于合成方法。在这项工作中，我们通过考虑一个原子自旋模型来研究它们对磁铁矿（FeO）薄膜的影响，将我们的研究重点放在交换相互作用在APB界面上所起的作用。我们得出结论，实验报道的这种材料的主要非典型特征可以很好地由我们这里提出的模型来描述，证实了在APB中产生的新交换相互作用是导致这种与体相性质偏差的原因。
