High magnetocaloric efficiency of a NiFe/NiCu/CoFe/MnIr multilayer in a small magnetic field

Article

关键词: THIN-FILMS;    MAGNETORESISTANCE;   

DOI  :  10.1103/PhysRevB.98.014428

来源: SCIE

【 摘 要 】

The isothermal magnetic entropy changes Delta S (i.e., the magnetocaloric potential) are studied in Ni80Fe20/Ni67Cu33/Co90Fe10/Mn80Ir20 stacks at temperatures near the Curie point of the Ni67Cu33 spacer by applying magnetic fields of a few milli-Tesla. Such fields were sufficient for toggling magnetic moments in the soft ferromagnetic layer ( Ni80Fe20). It is found that this switching provides a significant enhancement of Delta S in the heterostructure system with respect to that achieved in a single Ni67Cu33 film under such weak magnetic fields. Our finding is believed to have the potential to be utilized in magnetocaloric devices (e.g., thin-film coolers) that would be based on ferromagnetic/paramagnetic/ferromagnetic heterostructures and would operate with moderate magnetic fields.

【 授权许可】

Free