The magnonic superfluid droplet at room temperature

TL;DR

This paper reports the first observation of a room-temperature magnonic superfluid state in YIG, demonstrating long-range spin transport and potential for quantum applications like sensors and quantum computing.

Contribution

It is the first to experimentally demonstrate a spin superfluid state at room temperature in a ferromagnetic material, advancing supermagnonics technology.

Findings

Observation of spin superfluid state in YIG at room temperature

Identification of energy gap stabilizing superfluid transport

Potential applications in quantum technologies

Abstract

We declare the observation of spin superfluid state in Yttrium Iron Garnet (YIG) at room temperature. It is similar to a Homogeneous Precessing State (HPD), observed earlier in antiferromagnetic superfluid $^3$He-B. The formation of this state explains by the repulsive interaction between magnons, which is required as a prior condition for the spin superfluidity. It establishes an energy gap, which stabilizes the long range superfluid transport of magnetization and determines the Ginzburg-Landau coherence length. This discovery paves a way to many quantum applications of supermagnonics at room temperature, such as magnetic Josephson effect, long distance spin transport, Q-bit, quantum logics, magnetic sensors and others.