Broadening of magnetocaloric effect at elevated temperatures in nanocrystalline ZnFe2O4 thin films

Murtaza Bohra, Nitesh Singh, Sai Vittal Battula, Vidyadhar Singh, Anil Annadi, Evropi Toulkeridou, Panagiotis Grammatikopoulos*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


The detection and characterization of the Magnetocaloric Effect (MCE) at the nanoscale and its subsequent impact on next-generation cooling on-chip devices are of paramount importance. Here, we demonstrate that the MCE properties housed within a ferrimagnetic phase arise in disordered ZnFe2O4. The robustness of the MCE in terms of magnetic entropy change ΔSmax (=0.07–0.09 J/kg-K at 0.5 T) emerges in ZnFe2O4 thin films at larger temperature ranges 425–710 K, reaching above room temperature. By fitting the magnetization vs. temperature curves with a Gaussian-type distribution, we observed a correlation between the broadening of the MCE peak, Curie temperature (TC) distribution, and grain size distributions in nanocrystalline ZnFe2O4 thin films. The width of TC distributions increases (up to 150 K) and consequently, the ΔS curves show an extended full width at half maximum, resulting in larger relative cooling power (RCP), and a wider change in specific heat capacities (ΔCP) and adiabatic temperatures (ΔTad). This study reveals that tuning the relative strengths of the sublattice spin configuration of antiferromagnetic (AFM) ZnFe2O4 through in-situ and ex-situ heat treatment paves the way for the alteration of MCE properties.

Original languageEnglish
Article number107382
JournalResults in Physics
StatePublished - Feb 2024


  • Cation disorder
  • Curie temperature
  • Magnetocaloric effect
  • ZnFeO thin films


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