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The influence of magnetocrystalline anisotropy on the magnetocaloric effect: A case study on Co 2Bстатья
Статья опубликована в высокорейтинговом журнале
Статья опубликована в журнале из списка Web of Science и/или Scopus- Авторы: Fries M., Skokov K.P., Karpenkov D.Yu, Franco V., Ener S., Gutfleisch O.
- Журнал: Applied Physics Letters
- Том: 109
- Номер: 23
- Год издания: 2016
- Издательство: AIP Publishing
- Местоположение издательства: United States
- DOI: 10.1063/1.4971839
- Аннотация: The influence of magnetocrystalline anisotropy on the magnetocaloric effect (MCE) was studied on single crystals of Co2B and compared to measurements on polycrystalline samples. Large differences in adiabatic temperature change О” T a d and magnetic entropy change О” S M were found along the different crystallographic directions. The magnetocaloric effect differs by 40% in the case of О” T a d in a field change of 1.9 T when applying the field along the hard axis and easy plane of magnetization. In the case of О” S M, the values differ 50% and 35% from each other in field changes of 1 and 1.9 T, respectively. It was found that this anisotropy effect does not saturate in fields up to 4 T, which is higher than the anisotropy field of Co2B ( ≈2 T). A simple model was developed to illustrate the possible effect on magnetocrystalline anisotropy, showing large differences especially in application relevant fields of about 1 T. The results strongly suggest that the MCE could be maximized when orienting single crystalline powders in an easy axis parallel to the applied field in active magnetocaloric regenerator structures, and therefore the overall device efficiency could be increased. В© 2016 Author(s)
- Добавил в систему: Карпенков Дмитрий Юрьевич