Thermodynamics of interacting magnetic nanoparticles

P. Torche; C. Munoz-Menendez; D. Serantes; D. Baldomir; K. L. Livesey; O. Chubykalo-Fesenko; S. Ruta; R. Chantrell; O. Hovorka

doi:10.1103/PhysRevB.101.224429

Thermodynamics of interacting magnetic nanoparticles

P. Torche, C. Munoz-Menendez, D. Serantes, D. Baldomir, K. L. Livesey, O. Chubykalo-Fesenko, S. Ruta, R. Chantrell, O. Hovorka^*

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

Abstract

We apply the concepts of stochastic thermodynamics combined with transition-state theory to develop a framework for evaluating local heat distributions across the assemblies of interacting magnetic nanoparticles (MPs) subject to time-varying external magnetic fields. We show that additivity of entropy production in the particle state-space allows separating the entropy contributions and evaluating the heat produced by the individual MPs despite interactions. Using MP chains as a model system for convenience, without losing generality, we show that the presence of dipolar interactions leads to significant heat distributions across the chains. Our study also suggests that the typically used hysteresis loops cannot be used as a measure of energy dissipation at the local particle level within MP clusters, aggregates, or assemblies, and explicit evaluation of entropy production based on appropriate theory, such as developed here, becomes necessary.

Original language	English
Article number	224429
Number of pages	8
Journal	Physical Review B
Volume	101
Issue number	22
DOIs	https://doi.org/10.1103/PhysRevB.101.224429
Publication status	Published - 1 Jun 2020

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abstract = "We apply the concepts of stochastic thermodynamics combined with transition-state theory to develop a framework for evaluating local heat distributions across the assemblies of interacting magnetic nanoparticles (MPs) subject to time-varying external magnetic fields. We show that additivity of entropy production in the particle state-space allows separating the entropy contributions and evaluating the heat produced by the individual MPs despite interactions. Using MP chains as a model system for convenience, without losing generality, we show that the presence of dipolar interactions leads to significant heat distributions across the chains. Our study also suggests that the typically used hysteresis loops cannot be used as a measure of energy dissipation at the local particle level within MP clusters, aggregates, or assemblies, and explicit evaluation of entropy production based on appropriate theory, such as developed here, becomes necessary.",

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AU - Serantes, D.

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AU - Livesey, K. L.

AU - Chubykalo-Fesenko, O.

AU - Ruta, S.

AU - Chantrell, R.

AU - Hovorka, O.

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Thermodynamics of interacting magnetic nanoparticles

Abstract

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