What is it about?
Hopfions are three-dimensional nanoscale magnetization states that can occur in a ferromagnetic material. Although predicted theoretically, they remain hidden from experimental detection. This is mainly due to their small size and difficulties in visualizing the magnetization state inside the material. By calculating the full spin-wave spectra of hopfion in the microwave range we propose a new method for their spectral identification.
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Why is it important?
We show that the spin-wave spectra of hopfions in the microwave frequency range are very rich and consist of four main groups of spin-wave modes. We identified and visualized all the mode groups and calculated the resonance spectra expected from the ferromagnetic resonance measurements in the two main magnetic field configurations. The obtained results indicate that spin-wave resonance may be useful in the identification of hopfions using standard measurement techniques.
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This page is a summary of: Magnon spectrum of Bloch hopfion beyond ferromagnetic resonance, APL Materials, September 2022, American Institute of Physics, DOI: 10.1063/5.0100484.
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