Large refrigerant capacity in superparamagnetic iron nanoparticles embedded in a thin film matrix
نویسندگان
چکیده
A magnetocaloric effect (MCE) with sizable isothermal entropy change (ΔS) maintained over a broad range of temperatures above the blocking temperature is reported for rare earth-free superparamagnetic nanoparticle system comprising Fe–TiN heterostructure. Superparamagnetic iron (Fe) particles were embedded in titanium nitride (TiN) thin film matrix TiN/Fe/TiN multilayered pattern using pulsed laser deposition method. High angle annular dark-field images conjunction dispersive energy analysis, recorded scanning transmission electron microscopy, show clear presence alternating layers Fe and TiN distinct atomic number contrast between TiN. Quantitative information about multilayer has been obtained by applying Maxwell relation to magnetization vs data at various fields. With absence dynamic magnetic hysteresis temperature, negative ΔS as high 4.18 × 10 3 J/Km (normal or forward MCE) T 300 K.
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ژورنال
عنوان ژورنال: Journal of Applied Physics
سال: 2022
ISSN: ['1089-7550', '0021-8979', '1520-8850']
DOI: https://doi.org/10.1063/5.0120280