Imaging and phase-locking of non-linear spin waves

Rouven Dreyer, Alexander F. Schäffer, Hans G. Bauer, Niklas Liebing, Jamal Berakdar and Georg Woltersdorf ()
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Rouven Dreyer: Martin Luther University Halle-Wittenberg
Alexander F. Schäffer: Martin Luther University Halle-Wittenberg
Hans G. Bauer: Jahnstrasse 23
Niklas Liebing: Martin Luther University Halle-Wittenberg
Jamal Berakdar: Martin Luther University Halle-Wittenberg
Georg Woltersdorf: Martin Luther University Halle-Wittenberg

Nature Communications, 2022, vol. 13, issue 1, 1-8

Abstract: Abstract Non-linear processes are a key feature in the emerging field of spin-wave based information processing and allow to convert uniform spin-wave excitations into propagating modes at different frequencies. Recently, the existence of non-linear magnons at half-integer multiples of the driving frequency has been predicted for Ni80Fe20 at low bias fields. However, it is an open question under which conditions such non-linear spin waves emerge coherently and how they may be used in device structures. Usually non-linear processes are explored in the small modulation regime and result in the well known three and four magnon scattering processes. Here we demonstrate and image a class of spin waves oscillating at half-integer harmonics that have only recently been proposed for the strong modulation regime. The direct imaging of these parametrically generated magnons in Ni80Fe20 elements allows to visualize their wave vectors. In addition, we demonstrate the presence of two degenerate phase states that may be selected by external phase-locking. These results open new possibilities for applications such as spin-wave sources, amplifiers and phase-encoded information processing with magnons.

Date: 2022
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DOI: 10.1038/s41467-022-32224-0

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