Dissipative Spin-Wave Diode and Nonreciprocal Magnonic Amplifier

Area of Science:

• Spintronics
• Condensed Matter Physics
• Quantum Information Science

Background:

• Spin waves, or magnons, are fundamental to magnonics and spintronics.
• Controlling spin-wave propagation is crucial for developing novel electronic devices.
• Dissipation is often detrimental but can be engineered for functional applications.

Purpose of the Study:

• To propose and theoretically demonstrate an experimentally feasible spin-wave diode.
• To investigate the role of engineered dissipation in creating nonreciprocal spin-wave propagation.
• To explore spin-wave amplification and its connection to non-Hermitian topology.

Main Methods:

• Theoretical modeling of coupled magnetic layers with a nonmagnetic spacer.
• Analysis of coherent (Dzyaloshinskii-Moriya interaction) and dissipative couplings.
• Investigation of device response under incoherent pumping and in a ring structure.

Main Results:

• Demonstration of a spin-wave diode where wave propagation is unidirectional.
• Control of diode polarity via the sign of the Dzyaloshinskii-Moriya interaction.
• Realization of a unidirectional spin-wave amplifier with gain enhancement through cascading.

Conclusions:

• Engineered dissipation can create functional nonreciprocal devices like spin-wave diodes.
• The proposed device offers a new route for spin-wave control in spintronics.
• Connections between spin-wave amplification, dissipation, and non-Hermitian topology are established.