Activation Volumes of Magnetic Aftereffects: Role of the Chemical Potential in Nanomagnets
Edward Della Torre, Lawrence H. Bennett, S Rao, R E. Watson
Measurements of the thermal activation volume based upon the Street and Brown formulation for thermal magnetic aftereffect displayed a strong, albeit nonphysical, function of temperature. We have shown recently that the non-Arrhenius temperature variation of the thermal decay coefficient with temperature could be explained by a quasi-linear variation of the chemical potential above some finite Bose-Einstein condensation temperature. This paper shows how to correct the measured activation volume of a nanomagnet for this chemical potential variation, after which the volume is essentially temperature independent.
Physical Review Letters
activation volume, Bose-Einstein condensation, magnetic aftereffect, nanomagnet
, Bennett, L.
, Rao, S.
and Watson, R.
Activation Volumes of Magnetic Aftereffects: Role of the Chemical Potential in Nanomagnets, Physical Review Letters
(Accessed December 2, 2023)