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 April 8, 2025)
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Activation Volumes of Magnetic Aftereffects: Role of the Chemical Potential in Nanomagnets
Published
Author(s)
, , S Rao, R E. Watson
Abstract
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.Citation
Physical Review Letters
Pub Type
Journals
Keywords
activation volume, Bose-Einstein condensation, magnetic aftereffect, nanomagnet
Citation
Issues
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Created January 4, 2006, Updated February 17, 2017