Nanostructures of Magnetic Dirac Metals for RF Electronics
Abstract
The goal of this research is to create novel thin film bilayer platforms of quantum materials and soft ferromagnets for fabrication of spin – orbit torque (SOT) nano oscillators and microwave detectors. The SOT driven persistent oscillation of magnetization in heavy metal (HM) - ferromagnet (FM) bilayers is an emergent field of research with potential to yield a new class of frequency agile microwave devices for short range communications, neuromorphic computing, radar imaging arrays and spin wave emitters and detectors. While it has been established that a spin current from the HM into the FM of a HM-FM bilayer is much more efficient in torqueing the magnetization, compared to the effect of a spin current across a magnetic tunnel junction, the design of SOT based nanoscale microwave devices warrants addressing the following scientific challenges: (i) Identification of new HM materials that can produce large spin currents through spin Hall effect with potential for augmentation by the built in electric field at the symmetry breaking HM-FM interface. (ii) Growth of epitaxial thin films of such materials at lower temperatures with a scalable thin film deposition technique. (iii) Identification of soft FM materials that display robust magnetization of tunable anisotropy and can be grown at moderate temperatures. (iv) Integration of the HM film with the ferromagnet in situ, to ensure a clean, defect free interface that allows efficient transfer of spin angular momentum (SAM) across the HM-FM boundary. (v) Quantification of the spin orbit torque efficiency in such new class of bilayers.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Jan 14, 2022
- Source ID
- FA95501910082
Entities
People
- R. C. Budhani
Organizations
- Air Force Office of Scientific Research
- Morgan State University
- United States Air Force