Unidirectional propagation of zero-momentum magnons

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 dis...

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Bibliographic Details
Published inarXiv.org
Main Authors Wojewoda, Ondřej, Holobrádek, Jakub, Pavelka, Dominik, Pribytova, Ekaterina, Krčma, Jakub, Klíma, Jan, Michalička, Jan, Lednický, Tomáš, Chumak, Andrii V, Urbánek, Michal
Format Paper
LanguageEnglish
Published Ithaca Cornell University Library, arXiv.org 11.05.2024
Subjects
Anisotropy
Antiferromagnetism
Group velocity
Luminous intensity
Magnons
Momentum
Phase velocity
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Summary: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.
ISSN:2331-8422