Thermal activation in Permalloy nanorectangles at room temperature

E. Martinez, L. Lopez-Diaz, L. Torres, and C.J. García-Cervera.


The effect of thermal activation in planar Permalloy nanorectangles of thickness 2.5nm, width 20nm and different in plane aspect-ratio has been analized assuming uniform magnetization in the sample at room temperature. The relaxation times were computed by integrating the Langevin equation in the presence of external fields that reduce the energy barrier separating the two energy minima. From there data we obtain the pre-exponential factor in the Arrhenius formula for each aspect-ratio. That allows us to estimate the relaxation time in the absence of external field.

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Carlos Garcia Cervera