Unidirectional propagation of zero-momentum magnons

Andrii V. Chumak; Dominik Pavelka; Ekaterina Pribytova; Jakub Holobr\'adek; Jakub Kr\v{c}ma; Jan Kl\'ima; Jan Michali\v{c}ka; Michal Urb\'anek; Ond\v{r}ej Wojewoda; Tom\'a\v{s} Lednick\'y

Unidirectional propagation of zero-momentum magnons

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arxiv 2311.10044 v2 pith:Y4SO2ITM submitted 2023-11-16 cond-mat.mes-hall

Ondřej Wojewoda , Jakub Holobrádek , Dominik Pavelka , Ekaterina Pribytova , Jakub Krčma , Jan Klíma , Jan Michalička , Tomáš Lednický

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Andrii V. Chumak Michal Urbánek

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keywords cofebdirectionexperimentalmagnonsobservationpropagationsyntheticunidirectional

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We report on experimental observation of unidirectional propagation of zero-momentum magnons in synthetic antiferromagnet consisting of strained CoFeB/Ru/CoFeB trilayer. Inherent non-reciprocity of spin waves in synthetic antiferromagnets with uniaxial anisotropy results in smooth and monotonous dispersion relation around Gamma point, where the direction of the phase velocity is reversed, while the group velocity direction is conserved. The experimental observation of this phenomenon by intensity-, phase-, and time-resolved Brillouin light scattering microscopy is corroborated by analytical models and micromagnetic simulations.

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Spectroscopy of the spin waves of a synthetic antiferromagnet grown on a piezoelectric substrate
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A CoFeB/Ru/CoFeB synthetic antiferromagnet grown on LiNbO3 shows FMR damping, linewidth, dispersion, and group velocity comparable to SAFs on standard substrates, supporting a new acousto-magnonic platform.

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