Switching of exchange coupled grains

Thermally activated switching at long time scales in exchange-coupled magnetic grains.

Ahmad M. Almudallal, J. I. Mercer, J. P. Whitehead, M. L. Plumer, J. van Ek, and T. J. Fal

Phys. Rev. B 92, 134418 (2015)

The contour plot of the minimum energy surface for the weak coupling case I=0.5×10−3J/m2 for (a) H=0 and (b) H=4kOe. The black lines indicate the boundary separating each pair of basins of attraction {Ωα,Ωβ} and is denoted by Γαβ. The red lines indicate the MEP connecting the four minima. The lines cross at the saddle points sαβ.