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中国物理学会期刊

磁声耦合: 物理、材料与器件

CSTR: 32037.14.aps.73.20231908

Magneto-acoustic coupling: Physics, materials, and devices

CSTR: 32037.14.aps.73.20231908
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  • 固体中的声波有两种传播方式: 一种是声体波, 以纵波或横波的形式在固体内部传播; 另一种是声表面波, 在固体表面产生并沿着表面传播. 声波射频技术利用这些声波来截取和处理信号, 尤其体现在快速发展的射频滤波器技术中. 声学滤波器因其体积小、成本低和性能稳定等多方面的优势, 在移动通信等领域得到了广泛应用. 受益于成熟的制造工艺和确定的共振频率, 声波已逐渐成为操控磁性和自旋的有力手段, 这一领域正朝着小型化、超快和节能的自旋电子学器件应用迈进. 将磁性材料集成到声学射频器件, 也开辟了对声学器件调控方法和性能提升的新思路. 本综述首先梳理了各种磁声耦合的物理机制, 并在此基础上系统介绍了声控磁化动力学、磁化翻转、磁畴和磁性斯格明子产生及运动、自旋流产生等一系列磁性和自旋现象. 同时也讨论了声控磁的逆过程——磁控声波的研究进展, 包括声波参数的磁调控和声波的非互易传播, 以及基于此开发的新型磁声器件, 如磁传感器、磁电天线、可调谐滤波器等. 最后展望了磁声耦合未来可能的研究方向和潜在的应用前景.

     

    Acoustic wave in solid has two modes of propagation: the bulk acoustic wave (BAW), which propagates inside solid in the form of longitudinal or transverse wave, and the surface acoustic wave (SAW), which is generated on the surface of solid and propagates along the surface. In acoustic radio frequency (RF) technologies acoustic waves are used to intercept and process RF signals, which are typified by the rapidly developing RF filter technology. Acoustic filter has the advantages of small size, low cost, steady performance and simple fabrication, and is widely used in mobile communication and other fields. Due to the mature fabrication process and well-defined resonance frequency of acoustic device, acoustic wave has become an extremely intriguing way to manipulate magnetism and spin current, with the goal of pursuing miniaturized, ultra-fast, and energy-efficient spintronic device applications. The integration of magnetic materials into acoustic RF device also provides a new way of thinking about the methods of acoustic device modulation and performance enhancement. This review first summarizes various physical mechanisms of magneto-acoustic coupling, and then based on these mechanisms, a variety of magnetic and spin phenomena such as acoustically controlled magnetization dynamics, magnetization switching, magnetic domain wall and magnetic skyrmions generation and motion, and spin current generation are systematically introduced. In addition, the research progress of magnetic control of acoustic wave, the inverse process of acoustic control of magnetism, is discussed, including the magnetic modulation of acoustic wave parameters and nonreciprocal propagation of acoustic waves, as well as new magneto-acoustic devices developed based on this, such as SAW-based magnetic field sensors, magneto-electric antennas, and tunable filters. Finally, the possible research objectives and applications of magneto-acoustic coupling in the future are prospected. In summary, the field of magneto-acoustic coupling is still in a stage of rapid development, and a series of groundbreaking breakthroughs has been made in the last decades, and the major advances are summarized in this field. The field of magneto-acoustic coupling is expected to make further significant breakthroughs, and we hope that this review will further promote the researches of physical phenomena of the coupling between magnetism and acoustic wave, spin and lattice, and potential device applications as well.

     

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