Laser single-shot magnetization reversal in Co$_{1-x}$Lu$_x$ nanostructures
Résumé
The magnetic properties of Pt/Co$_{1-x}$Lu$_x$/Pt thin films have been investigated. For an alloy thickness of 3 nm, the saturation magnetization linearly decreases from 830 kA/m to 400 kA/m for x varying between 18% and 40%, including the proximity-induced moment in platinum. Furthermore, we show that Co$_{1-x}$Lu$_x$ alloys 3 nm thick thin films have a perpendicular magnetic anisotropy for a concentration ranging between 25% and 40%. A single femtosecond laser shot leads to a demagnetized state with a domain size that increases with the decrease of saturation magnetization. Patterning the layer into dots leads to a single domain structure that can be fully reversed using a single laser pulse. The statistics and the origin of the nondeterministic reversal are discussed based on the atomistic model.
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