Static and dynamic properties of vortex pairs in asymmetric nanomagnets
B. C. Koop, M. Gruschke, T. Descamps, A. Bondarenko, B. A. Ivanov, V., Korenivski
TL;DR
This paper investigates the nonlinear spin dynamics of vortex pairs in asymmetric nanomagnets, revealing resonance modes caused by strong core-core coupling and asymmetries, advancing understanding of magnetic multilayered nanopillars.
Contribution
It introduces the analysis of nonlinear spin resonance modes in vortex pairs influenced by asymmetries, highlighting the role of core-core coupling in magnetic nanostructures.
Findings
Observation of forbidden spin resonance modes
Dependence of modes on magnetic and morphological asymmetries
Dominance of core-core coupling in small-signal dynamics
Abstract
Stacked spin-vortex pairs in magnetic multilayered nanopillars, with vertical separation between the vortices small compared to the vortex core size, exhibit spin dynamics absent in individual vortices. This dynamics is nonlinear and is due to the strong direct core-core coupling in the system, dominating energetically for small- signal excitation. We observe and explain the appearance of spin resonance modes, forbidden within linear dynamics, and discuss how they depend on the magnetic and morphological asymmetries in the samples.
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