Hertel Riccardo, Schneider Claus M
Institut für Festkörperforschung IFF-9 Elektronische Eigenschaften, Forschungszentrum Jülich GmbH, D-52425 Jülich, Germany.
Phys Rev Lett. 2006 Oct 27;97(17):177202. doi: 10.1103/PhysRevLett.97.177202. Epub 2006 Oct 23.
A magnetic vortex and an antivortex can annihilate, resulting in a homogeneous magnetization. A detailed description of the magnetization dynamics of such annihilation processes is obtained by micromagnetic simulations based on the Landau-Lifshitz-Gilbert equation. We show that, depending on the relative polarization of the vortex-antivortex pair, the annihilation process is either a continuous transformation of the magnetic structure or it involves the propagation of a micromagnetic singularity (Bloch point) causing a burstlike emission of spin waves. These results provide new insight into a fundamental micromagnetic process that has recently been proposed for a controlled generation of spin waves.
磁涡旋和反磁涡旋会相互湮灭，从而产生均匀的磁化强度。基于朗道 - 里夫希茨 - 吉尔伯特方程的微磁模拟，得到了此类湮灭过程磁化动力学的详细描述。我们表明，根据涡旋 - 反磁涡旋对的相对极化情况，湮灭过程要么是磁结构的连续转变，要么涉及微磁奇点（布洛赫点）的传播，从而导致自旋波的爆发式发射。这些结果为最近提出的用于自旋波受控产生的基本微磁过程提供了新的见解。
