Macrospin in external magnetic field: entropy production and fluctuation theorems

Bandopadhyay, S and Chaudhuri, Debasish and Jayannavar, A M (2015) Macrospin in external magnetic field: entropy production and fluctuation theorems. Journal of Statistical Mechanics: Theory and Experiment, 2015. ISSN 1742-5468

Full text not available from this repository. (Request a copy)


We consider stochastic rotational dynamics of a macrospin at a constant temperature, in the presence of an external magnetic field. Starting from the appropriate Langevin equation, which contains multiplicative noise, we calculate entropy production (EP) along stochastic trajectories, and obtain fluctuation theorems. The system remains inherently out of equilibrium due to a spin torque supporting an azimuthal current, leading to an excess EP in addition to the EP due to heat dissipation. The anomaly may be removed using a redefinition of dissipated heat and stochastic work done. Using numerical simulations, we obtain distribution functions for EP along stochastic trajectories to find good agreement with the detailed fluctuation theorem.

[error in script]
IITH Creators:
IITH CreatorsORCiD
Chaudhuri, DebasishUNSPECIFIED
Item Type: Article
Subjects: Physics
Divisions: Department of Physics
Depositing User: Team Library
Date Deposited: 02 Dec 2015 06:56
Last Modified: 30 Aug 2017 10:56
Publisher URL:
OA policy:
Related URLs:

Actions (login required)

View Item View Item
Statistics for RAIITH ePrint 2054 Statistics for this ePrint Item