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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


Della, E. , Bennett, L. , Rao, S. and Watson, R. (2006), Activation Volumes of Magnetic Aftereffects: Role of the Chemical Potential in Nanomagnets, Physical Review Letters (Accessed May 19, 2024)


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Created January 4, 2006, Updated February 17, 2017