Faculty of Physics and Mathematics, National Technical University of Ukraine "Igor Sikorsky Kyiv Polytechnic Institute", Peremohy Ave. 37, Kyiv, 03056, Ukraine.
Department of Physics of Meso- and Nanocrystal Magnetic Structures, Institute of Magnetism, National Academy of Sciences of Ukraine and Ministry of Education and Science of Ukraine, Vernadsky Blvd. 36b, Kyiv, 03142, Ukraine.
Sci Rep. 2023 Apr 24;13(1):6613. doi: 10.1038/s41598-023-33220-0.
We report a theoretical study of the localized spatial magnetization configuration, which is a confined spin configuration of the target skyrmion/hopfion type in an antiferromagnet with perpendicular magnetic anisotropy, and then we solve the particular problem of self-oscillations of such a topological spin texture. Using the energy approach, a self-consistent account of inhomogeneity of the characteristics of the topological magnetic spin texture was carried out. On this basis, the equation of free oscillations of the confined spin configuration magnetization was derived and its quasi-classical solution was found. For a thin ring spin texture, the frequency, period of oscillations and relative amplitude of the main tone of oscillations are found. For the first time, we determined the topological mass, inertial mass and total energy of the main tone of oscillations of such spatial spin texture. The self-oscillatory process of a spatial spin texture is interpreted as a magnetic nano-oscillator.
我们报告了一项关于局域空间磁化配置的理论研究，这是一种在具有垂直磁各向异性的反铁磁体中目标 skyrmion/ hopfion 型的受限自旋配置，然后我们解决了这种拓扑自旋结构自激的特殊问题。我们采用能量法，对拓扑磁自旋结构特征的非均匀性进行了自洽处理。在此基础上，推导出了受限自旋配置磁化自由振荡的方程，并找到了其准经典解。对于薄环形自旋结构，我们找到了振荡的频率、周期和主要调幅的相对幅度。我们首次确定了这种空间自旋结构的主要调幅的拓扑质量、惯性质量和总能量。空间自旋结构的自激振荡过程被解释为磁纳米振荡器。
