Macrospin in external magnetic field: Entropy production and fuctuation theorems

Bandopadhyay, S and Chaudhuri, Debasish and Jayannavar, A M (2014) Macrospin in external magnetic field: Entropy production and fuctuation theorems. Condensed Matter. pp. 1-8. (Submitted)

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We consider stochastic rotational dynamics of a single magnetic domain in an external magnetic field, at constant temperature. Starting from the appropriate Langevin equation of motion, we calculate entropy production along stochastic trajectories to obtain uctuation theorems, by presenting several possibilities of choosing conjugate trajectories. One of these choices gives entropy production in the reservoir that is consistent with prediction from Fokker-Planck equation. We further show the relation between heat absorbed and entropy production in the reservoir, using stochastic energy balance. For a time-independent field, the magnetization obeys Boltzmann distribution, however, also supports an azimuthal current making the dynamics inherently non-equilibrium. We use numerical simulations to obtain distribution functions for entropy production along trajectories which show good agreement with the detailed uctuation theorem.

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IITH Creators:
IITH CreatorsORCiD
Chaudhuri, DebasishUNSPECIFIED
Item Type: Article
Additional Information: We thank Udo Seifert, Abhishek Dhar, and Pun- yabrata Pradhan for valuable discussions.
Subjects: Physics
Divisions: Department of Physics
Depositing User: Library Staff
Date Deposited: 23 Feb 2015 11:15
Last Modified: 30 Aug 2017 10:59
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