Exchange explosions: Magnetization dynamics during vortex-antivortex annihilation

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 rel...

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Bibliographic Details
Published in:Physical review letters 2006-10, Vol.97 (17), p.177202-177202, Article 177202
Main Authors: Hertel, Riccardo, Schneider, Claus M
Format: Article
Language:English
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Summary: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.
ISSN:0031-9007
1079-7114
DOI:10.1103/physrevlett.97.177202