Gareeva Zukhra, Shulga Nikolai, Doroshenko Rurik, Zvezdin Anatoly
Institute of Molecule and Crystal Physics, Subdivision of the Ufa Federal Research Centre of the Russian Academy of Sciences, 450075, Ufa, Russia.
HSE University, 101000, Moscow, Russia.
Phys Chem Chem Phys. 2023 Aug 23;25(33):22380-22387. doi: 10.1039/d3cp02913a.
Multiferroic oxides are considered as key elements of energy-consuming devices required for the development of scalable logic and information storage technologies. In this regard, understanding the mechanisms of magnetoelectric switching and finding the optimal way to switch magnetization by an electric field is of crucial importance. In this study, we develop a model for studying magnetic states in a nanoscale exchange-coupled ferromagnetic-multiferroic heterostructure subjected to the action of an electric field. Based on bias effects emerging due to the coupling between a ferromagnetic subsystem and an antiferromagnetically ordered multiferroic material, we explore the magnetic textures and the magnetization reversal processes in a ferromagnet. As the multiferroic material, we consider BiFeO, where magnetic ordering and ferroelectric ordering are determined by the mutually perpendicular antiferromagnetic (), weak ferromagnetic () and polarization () vectors. Application of an electric voltage removes degeneration from eight energetically equivalent positions of || 〈111〉, allocates the definite directions of vectors , , and and as a consequence the unidirectional magnetic anisotropy axis in the reference ferromagnetic layer. Our study reveals the features of the magnetic configurations in systems of different geometries, with varying exchange and magnetic anisotropy, necessary to determine the optimal conditions for switching magnetic states in a multiferroic bi-layer by an electric field.
多铁性氧化物被认为是可扩展逻辑和信息存储技术发展所需的耗能设备的关键元件。在这方面，理解磁电开关机制并找到通过电场切换磁化强度的最佳方法至关重要。在本研究中，我们开发了一个模型，用于研究在电场作用下的纳米级交换耦合铁磁 - 多铁性异质结构中的磁状态。基于铁磁子系统与反铁磁有序多铁性材料之间耦合产生的偏置效应，我们探索了铁磁体中的磁织构和磁化反转过程。作为多铁性材料，我们考虑BiFeO₃，其中磁有序和铁电有序由相互垂直的反铁磁（）、弱铁磁（）和极化（）矢量决定。施加电压消除了||〈111〉的八个能量等效位置的简并性，确定了矢量、和的明确方向，结果在参考铁磁层中形成了单向磁各向异性轴。我们的研究揭示了不同几何形状、具有不同交换和磁各向异性的系统中磁构型的特征，这些特征对于确定通过电场在多铁性双层中切换磁状态的最佳条件是必要的。
