Collective spin excitations in quantum magnets
Abstract
We request equipment to investigate collective spin excitations (i.e. magnons) in new materials that combine the concepts of topology and magnetism. The proposed projects build on our new understanding and observations of magnons in two classes of materials: CoTiO3 bulk crystals that host Dirac magnons and van der Waals topological insulators with intrinsic magnetic orders MnBi2Te4. In magnetic semiconductors or insulators, the spin current is carried by magnons. We will use inelastic scattering experiments to probe magnons in these materials and search for key signatures of topologically protected modes with optimal properties for spintronic applications including low-damping, a high group velocity, and a long propagation distance. Our proposed studies will also shine new light on challenging scientific questions such as how to distinguish thermal Hall effects arising from phonons and magnons. The proposed projects, if successfully completed, may lead to exciting breakthroughs in spintronics. The commonly used memory devices (e.g. hard disks) are based on magnetic multilayers. It is predicted that by 2030, data centers will require 8% of the worldÕs total electricity. Finding new materials with different magnon properties will lay the foundation for developing new spintronic devices for non-volatile information storage and processing, critical for meeting the missions of DoD agencies.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Aug 02, 2022
- Source ID
- W911NF2210152
Entities
People
- Xiaoqin Li
Organizations
- Army Contracting Command
- United States Army
- University of Texas at Austin