Dynamic unidirectional anisotropy in cubic FeGe with antisymmetric spin-spin-coupling

Josten, Nicolas; Feggeler, Thomas;
GND
118133012
LSF
46939
Meckenstock, Ralf; Spoddig, Detlef;
GND
1215231571
LSF
3606
Spasova, Marina; Chai, Ke; Radulov, Iliya; Li, Zi-An;
GND
1196907943
ORCID
0000-0001-8021-3839
Zugehörige Organisation
Department of Material- and Geosciences, Functional Materials, Technische Universität Darmstadt, Darmstadt, 64287, Germany.
Gutfleisch, Oliver; Farle, Michael; Zingsem, Benjamin

Strong unidirectional anisotropy in bulk polycrystalline B20 FeGe has been measured by ferromagnetic resonance spectroscopy. Such anisotropy is not present in static magnetometry measurements. B20 FeGe exhibits inherent Dzyaloshinskii-Moriya interaction, resulting in a nonreciprocal spin-wave dispersion. Bulk and micron sized samples were produced and characterized. By X-band ferromagnetic resonance spectroscopy at 276 K ± 1 K, near the Curie temperature, a distribution of resonance modes was observed in accordance with the cubic anisotropy of FeGe. This distribution exhibits a unidirectional anisotropy, i.e. shift of the resonance field under field inversion, of KUD = 960 J/m3 ± 10 J/m3, previously unknown in bulk ferromagnets. Additionally, more than 25 small amplitude standing spin wave modes were observed inside a micron sized FeGe wedge, measured at 293 K ± 2 K. These modes also exhibit unidirectional anisotropy. This effect, only dynamically measurable and not detectable in static magnetometry measurements, may open new possibilities for directed spin transport in chiral magnetic systems.

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