Dissipative Spin-wave Diode and Nonreciprocal Magnonic Amplifier

Abstract

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.

13 pages including supplemental material; 4 figures

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• Nonreciprocal superradiant quantum phase transition induced by the magnon Kerr effect
• Universal quantum control over non-Hermitian continuous-variable systems
• Semiclassical analysis of spin dynamics in the non-Hermitian Hubbard model
• Robust Tripartite Entanglement Generation via Correlated Noise in Spin Qubits
• Spin and thermal current scaling at a $Y$-junction of XX spin chains