Berlin 2024 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 34: Focus Session: Dynamical Probes for Topological Magnetism

TT 34.4: Invited Talk

Wednesday, March 20, 2024, 11:15–11:45, H 0104

Dissipative Spin-wave Diode and Nonreciprocal Magnonic Amplifier — •Jelena Klinovaja, Ji Zou, Stefano Bosco, Even Thingstad, and Daniel Loss — Department of Physics University of Basel Klingelbergstrasse 82 4056 Basel, Switzerland

We propose an experimentally feasible dissipative spin-wave diode comprising two magnetic layers coupled via a non-magnetic spacer. We theoretically demonstrate that the spacer mediates not only coherent interactions but also dissipative coupling. Interestingly, an appropriately engineered dissipation engenders a nonreciprocal device response, facilitating the realization of a spin-wave diode. This diode permits wave propagation in one direction alone, given that the coherent Dzyaloshinskii- Moriya (DM) interaction is balanced with the dissipative coupling. The polarity of the diode is determined by the sign of the DM interaction. Furthermore, we show that when the magnetic layers undergo incoherent pumping, the device operates as a unidirectional spin-wave amplifier. The amplifier gain is augmented by cascading multiple magnetic bilayers. By extending our model to a one-dimensional ring structure, we establish a connection between the physics of spin-wave amplification and non-Hermitian topology. Our proposal opens up a new avenue for harnessing inherent dissipation in spintronic applications.

[1] Ji Zou, S. Bosco, E. Thingstad, J. Klinovaja, D. Loss, arXiv:2306.15916