A5066131914- Magnetic properties of thin films
- Theoretical and Computational Physics
- Magnetic and transport properties of perovskites and related materials
- Magnetic Properties and Applications
- Force Microscopy Techniques and Applications
- Aluminum Alloy Microstructure Properties
- Cold Atom Physics and Bose-Einstein Condensates
- Characterization and Applications of Magnetic Nanoparticles
- Advanced Frequency and Time Standards
- Advanced Electron Microscopy Techniques and Applications
- ZnO doping and properties
- Metallic Glasses and Amorphous Alloys
- Electron and X-Ray Spectroscopy Techniques
- Metallurgical and Alloy Processes
- Atomic and Subatomic Physics Research
- Acoustic Wave Resonator Technologies
University of Nebraska–Lincoln
2018-2023
Domain walls in magnetic thin films are being explored for memory applications and the speed at which they move has acquired increasing importance. Magnetic fields currents have been shown to drive domain with speeds exceeding 500 m/s. We investigate another approach increase wall velocities, using high frequency surface acoustic waves create standing strain a 3 micron wide strip of film perpendicular anisotropy. Our measurements, resonant 248.8 MHz, indicate that velocities substantially,...
We investigate the effects of high frequency strain on depinning magnetic domain walls in perpendicular anisotropy materials. Micron wide stripes [Co(0.3 nm)/Pt(0.6 nm)]5 are patterned between a pair identical inter-digital transducers that generate (114.8 MHz) standing surface acoustic waves. use magneto-optical Kerr effect microscopy to characterize thermally-assisted at defect sites within strips. Our results show excitation with waves an increase their probabilities by approximately...
We report the modification of a gas phase ultrafast electron diffraction (UED) instrument that enables experiments with both and condensed matter targets, where time-resolved experiment sub-picosecond resolution is demonstrated solid state samples. The relies on hybrid DC-RF acceleration structure to deliver femtosecond pulses target, which synchronized laser pulses. are used excite sample probe structural dynamics, respectively. new system added capabilities perform transmission UED thin It...
Abstract We study the influence of defects in Co/Pt multilayers on room-temperature magnetization reversal and relaxation mechanisms via angle-dependent magnetic viscosity coercive field measurements. The data reveal a transition from pinning-dominated domain wall propagation to sequence uniform switching, with increasing tilt away normal direction. leading role dendritic nanogranular exchange-coupled films is corroborated by scaling times, angular dependence field, Kerr microscopy.
CuMnAs with perpendicular magnetic anisotropy is proposed as an active material for antiferromagnetic memory. Information can be stored in the domain state, while writing and readout rely on existence of surface magnetization. It predicted, based first-principles calculations, that easy-axis achieved bulk by substituting a few percent As atoms Ge, Si, Al, or B. This effect attributed to changing occupation certain electronic bands near Fermi level induced hole doping. The calculated...