Experimental Demonstration of Room-Temperature Spin Superfluidity
Abstract
Yttrium iron garnet (YIG), with its extremely low magnetic damping, is perhaps the optimum magnetic material for exploration of spin superfluidity. While there have been considerable theoretical studies on spin superfluidity in YIG thin films, so far there has been no experimental work of note. This STIR project aims to use low-damping YIG thin films to demonstrate room-temperature spin superfluidity for the first time. It also aims to explore the spatial characteristics of spin supercurrents. Perpendicularly-polarized spin currents from a lateral spin valve will be pumped into a YIG thin film to excite spin superfluidity. The detection of the spin superfluidity will rely on spin supercurrent-induced resistance changes in a ferromagnetic metal/normal metal bi-layered structure built on the top of the YIG film. The nature of the spin superfluidity state will be confirmed by measuring the spatial characteristics of the spin supercurrent. The results from this project will significantly promote the understanding of the spin superfluidity and spin supercurrent phenomena and will therefore significantly advance the research field of spin superfluidity, a new field that draws inspiration from both the magnetization dynamics and spintronics communities in particular and from the broad condensed matter physics community in general.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- May 20, 2019
- Source ID
- W911NF1910333
Entities
People
- Mingzhong Wu
Organizations
- Army Contracting Command
- Colorado State University
- United States Army