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Articles you may be interested inEffect of multilayer configuration of [Fe/Pt] multilayer to attain (001) oriented FePt ordered alloy thin films J. Appl. Phys. 107, 09A715 (2010); 10.1063/1.3337648 Low-temperature ordering of FePt by formation of silicides in underlayers J. Appl. Phys. 97, 10H310 (2005); 10.1063/1.1861415 C -axis oriented L 1 0 phase FePt thin films by plasma-assisted diffusion

Magnetization of an isolated single dot as small as 60 nm in diameter fabricated from a single crystal L10-FePt(001) film has been measured by detection of the anomalous Hall effect in the temperature range from 10 to 300 K. Over the whole temperature range, the dots with diameter ranging from 60 nm to 12 μm exhibit perfect rectangular magnetization loops with coercivity almost constant regardless of the very large difference in diameter. The activation energy has been evaluated to be about 4×10−19 J, equivalent to the domain-wall energy times the square of the domain-wall thickness, suggesting that the magnetization reversals are initiated by nucleation of reversed embryo with the dimension of the exchange length.

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