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Magnetic bistability of Co nanodots
H F Ding1, A K Schmid, Dongqi Li
1Materials Science Division, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, Illinois 60439, USA.
Physical Review Letters
|May 21, 2005
Summary
The magnetic stability of cobalt nanodots depends on their size, allowing for both single-domain and vortex states near a phase boundary. This finding aligns with experimental observations and simulations.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Nanotechnology
Background:
- Understanding magnetic states in nanostructures is crucial for data storage and spintronics.
- Cobalt-Ruthenium (Co/Ru) nanodots exhibit complex magnetic behaviors influenced by size and interface properties.
Purpose of the Study:
- To investigate the size-dependent stability of single-domain versus vortex magnetic states in Co/Ru(0001) nanodots.
- To determine the phase boundary and bistability region for these magnetic states.
Main Methods:
- Spin-polarized low-energy electron microscopy (SPLEEM) for experimental observation.
- Analytical modeling to understand magnetic interactions.
- Micromagnetic simulations to predict magnetic configurations.
Main Results:
- Both single-domain and vortex magnetic states are stabilized in a wide region near the phase boundary.
- The calculated width of the bistability region shows good agreement with experimental data.
- Temperature-dependent energy barriers between states were accurately predicted by simulations.
Conclusions:
- The study provides a comprehensive understanding of magnetic state stability in Co/Ru nanodots.
- Experimental and simulation results confirm the size-dependent nature of magnetic domain stability.
- This research contributes to the design of magnetic nanodevices.