Fig. 3: Magnetic field dependence of activation volume.
From: Role of atomic-scale thermal fluctuations in the coercivity
a The activation volume V as a function of μ0Hz for two system sizes at \(0.46\,{T}_{{\rm{C}}}^{{\rm{cal}}}\). Circle points are evaluated from Eq. 3 while solid lines are evaluated from Eq. 4. Squared lines are the exponent n of free energy barrier in formula 6. b Field dependence of the shape of free energy as a function of δMz for Lx = 24.6 nm. Blue points are the top of the free energy barrier, which corresponds to Mt, and black arrows denote the cusp in the free energy. Green line shows the value on the right axis.
