Strain tuning lithium ferrite thin films through Al substitution
ORAL
Abstract
In order to realize next generation spintronics that utilize spin-waves to transport magnetic information without dissipative charge currents, we must develop high-quality, ultra-thin film magnetic insulators that combine low magnon damping and perpendicular magnetic anisotropy (PMA). Ferrimagnetic spinel structure Li0.5AlxFe2.5-xO4 (LAFO) has been identified as a material that combines these properties, making it an important material for further analysis towards the goal of creating highly energy-efficient electronics. To determine the optimal composition of LAFO, we have investigated an array of compositions deposited on MgGa2O4 substrates with Al substitution ranging from x=0.5-1.0. Al substitution modifies the saturation magnetization and magnetic anisotropy while maintaining ultra-low Gilbert damping parameters ranging from 2x10-4 to 1x10-3.Through this work we have identified LAFO composition x=0.7 which combines ultra-low damping (~2x10-4), PMA and very small saturation fields, thus making it very promising for spintronic applications.
*This work was supported by the U.S. Department of Energy, Director, Office of Science, Office of Basic Energy Sciences, Division of Materials Sciences and Engineering under Contract No. DESC0008505. This research used resources of the Advanced Light Source, which is a DOE Office of Science User Facility under contract no. DE-AC02-05CH11231.
–
Presenters
-
Daisy O'Mahoney
- Stanford University