Magnetocaloric materials with ultra-small magnetic nanoparticles working at room temperature

Through the use of the Monte Carlo simulations utilising the mean-field approach, we show that a dense assembly of separated ultra-small magnetic nanoparticles embedded into a non-magnetic deformable matrix can be characterized by a large isothermal magnetic entropy change even upon applying a weak...

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Bibliographic Details
Published in:Scientific reports 2019-11, Vol.9 (1), p.17607-10, Article 17607
Main Authors: Dudek, M. R., Dudek, K. K., Wolak, W., Wojciechowski, K. W., Grima, J. N.
Format: Article
Language:English
Subjects:
639/301
639/301/357/997
Entropy
Humanities and Social Sciences
Magnetic fields
Monte Carlo simulation
multidisciplinary
Nanoparticles
Refrigerants
Science
Science (multidisciplinary)
Temperature requirements
Thin films
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Summary:Through the use of the Monte Carlo simulations utilising the mean-field approach, we show that a dense assembly of separated ultra-small magnetic nanoparticles embedded into a non-magnetic deformable matrix can be characterized by a large isothermal magnetic entropy change even upon applying a weak magnetic field with values much smaller than one Tesla. We also show that such entropy change may be very significant in the vicinity of the room temperature which effect normally requires an application of a strong external magnetic field. The deformable matrix chosen in this work as a host for magnetic nanoparticles adopts a thin film form with a large surface area to volume ratio. This in turn in combination with a strong magneto-volume coupling exhibited by this material allows us to show its suitability to be used in the case of a variety of applications utilising local cooling/heating such as future magnetic refrigerants.
ISSN:2045-2322
2045-2322
DOI:10.1038/s41598-019-53617-0