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Stabilization of magnetic helix in exchange-coupled thin films

MPS-Authors
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Meier,  Guido
The Hamburg Centre for Ultrafast Imaging, Luruper Chaussee 149, 22761 Hamburg, Germany;
Dynamics and Transport in Nanostructures, Condensed Matter Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;
Ultrafast Electronics, Scientific Service Units, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;
Center for Free-Electron Laser Science, Luruper Chaussee 149, 22761 Hamburg, Germany;

Fulltext (public)

srep16153.pdf
(Publisher version), 603KB

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Citation

Dzemiantsova, L. V., Meier, G., & Röhlsberger, R. (2015). Stabilization of magnetic helix in exchange-coupled thin films. Scientific Reports, 5: 16153. doi:10.1038/srep16153.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0029-20B6-3
Abstract
Based on micromagnetic simulations, we report on a novel magnetic helix in a soft magnetic film that is sandwiched between and exchange-coupled to two hard magnetic layers with different anisotropies. We show that such a confined helix stays stable without the presence of an external magnetic field. The magnetic stability is determined by the energy minimization and is a result of an internal magnetic field created by the exchange interaction. We show that this internal field stores a magnetic energy density of a few kJ/m3. We also find that it dramatically modifies ferromagnetic resonances, such that the helix can be used as a ferromagnetic resonance filter and a fast acting attenuator.