Thermal effects in self-assembled FePt nanoparticles with partial chemical ordering

Harrell, J. W.; Wang, S.; Nikles, D. E.; Chen, M.
December 2001
Applied Physics Letters;12/24/2001, Vol. 79 Issue 26, p4393
Academic Journal
We have studied the thermal stability of self-assembled FePt nanoparticles with partial chemical ordering. The magnetic viscosity was measured at zero field after partial dc demagnetization as a function of the initial remanent magnetization. The viscosity curves are in good agreement with a calculation using a noninteracting Stoner–Wohlfarth, Arrhenius–Ne´el model with a broad distribution of anisotropy fields and randomly oriented easy axes. The shape of the zero field viscosity curve differs from curves measured for thin film media with in-plane and perpendicular anisotropy, in which interactions are known to be important. © 2001 American Institute of Physics.


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