Frequency multiplication and spin wave generation by nonlinear magnetization dynamics

Georg Woltersdorf; Rouven Dreyer; Chris Koerner

doi:10.1117/12.2677467

28 September 2023 Frequency multiplication and spin wave generation by nonlinear magnetization dynamics

Georg Woltersdorf, Rouven Dreyer, Chris Koerner

Author Affiliations +

Proceedings Volume PC12656, Spintronics XVI; PC126561D (2023) https://doi.org/10.1117/12.2677467
Event: SPIE Nanoscience + Engineering, 2023, San Diego, California, United States

Abstract

Frequency multiplication and frequency conversion are important processes in modern electronics in which harmonics of the input frequency are generated in nonlinear electronic circuits. Devices based on the propagation and interaction of spin waves represent a promising alternative to conventional electronics. However, the characteristic frequency of spin waves is in the gigahertz range, and thus cannot be easily combined with conventional electronics. We investigate the magnetic excitations in magnetic materials using optical methods and show that excitation at frequencies in the megahertz range can cause magnetic switching processes on the micrometer scale, and these lead to coherent spin wave emission in the gigahertz range. Moreover, at high modulation amplitudes, we demonstrate a new class of nonlinear spin waves that oscillate with half-integer harmonics of the excitation. Imaging of these parametrically generated spin waves enables measurement of the wave vectors and determination of the coherence properties. In addition, we demonstrate the existence of two degenerate phase states, each of which can be selected by the phase position of an external signal source. The frequency multiplication process occurring within the magnetic medium covers more than six octaves and opens new perspectives for applications such as fully magnetic mixers or "on-chip" signal generators. The phase-coherent excitation and control of half-integer harmonic spin waves is highly interesting for applications such as amplifiers and phase-encoded spin-wave-based information processing.

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Georg Woltersdorf, Rouven Dreyer, and Chris Koerner "Frequency multiplication and spin wave generation by nonlinear magnetization dynamics", Proc. SPIE PC12656, Spintronics XVI, PC126561D (28 September 2023); https://doi.org/10.1117/12.2677467

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KEYWORDS

Harmonic generation

Magnetism

Optical coherence

Signal processing

Materials properties

Modulation

Optical switching

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