Magnonic $\phi$ Josephson junctions and synchronized precession

Abstract

There has been a growing interest in non-Hermitian physics. One of its main goals is to engineer dissipation and to explore ensuing functionality. In magnonics, the effect of dissipation due to local damping on magnon transport has been explored. However, the effects of non-local damping on the magnonic analog of the Josephson effect remain missing, despite that non-local damping is inevitable and has been playing a central role in magnonics. Here, we uncover theoretically that a surprisingly rich dynamics can emerge in magnetic junctions due to intrinsic non-local damping, using analytical and numerical methods. In particular, under microwave pumping, we show that coherent spin precession in the right and left insulating ferromagnet (FM) of the junction becomes synchronized by non-local damping and thereby a magnonic analog of the $\phi$ Josephson junction emerges, where $\phi$ stands here for the relative precession phase of right and left FM in the stationary limit. Remarkably, $\phi$ decreases monotonically from $\pi$ to $\pi /2$ as the magnon-magnon interaction, arising from spin anisotropies, increases. Moreover, we also find a magnonic diode effect giving rise to rectification of magnon currents. Our predictions are readily testable with current device and measurement technologies at room temperatures.

5+7 pages, 3+3 figures

References in corpus (8)

• Spin current and magneto-electric effect in non-collinear magnets
• Direct coupling between magnetism and superconducting current in Josephson Phi junction
• Experimental evidence of a ϕ Josephson junction
• Spin Currents and Magnon Dynamics in Insulating Magnets
• Exceptional points in dissipatively coupled spin dynamics
• Dissipative Spin-wave Diode and Nonreciprocal Magnonic Amplifier
• Geometric pi Josephson junction in d-wave superconducting thin films
• Towards an experimental proof of the magnonic Aharonov$-$Casher effect

Cited by in corpus (5)

• Nonreciprocal superradiant quantum phase transition induced by the magnon Kerr effect
• Tunable Ultrafast Dynamics of Antiferromagnetic Vortices in Nanoscale Dots
• Engineering Ponderomotive Potential for Realizing $\pi$ and $\pi /2$ Bosonic Josephson Junctions
• Ferroelectricity in a magnon Bose-Einstein condensate: Nonreciprocal superfluidity, exceptional points, and Majorana bosons
• Robust Tripartite Entanglement Generation via Correlated Noise in Spin Qubits