Search

A phenomenological model (PM) is applied to simulate magnetocaloric effect (MCE) of YbFe2As2 (YFA) sample. Based on PM, MCE parameters are deduced as the results of simulation for magnetization versus temperature under 5 T magnetic field. The maximum value of magnetic entropy change is 2.55 J/kg K. The values of full-width at half-maximum relative cooling power and refrigerant capacity are 34 K, 87 J/kg, and 62.6 J/kg, respectively. It is recommended that YFA can be used as an effective material of magnetic refrigerator over a temperature range, covering a significant range of temperature between 0 and 50 K. This indicates that YFA is considered as the MCE material functioning at a liquid helium temperature zone. [ABSTRACT FROM AUTHOR]

The magnetocaloric effect (MCE) of NaFeO2 nanoparticles has been investigated by phenomenological model (PM). The simulated temperature-dependent magnetization data are in good agreement with the experimental one. Based on PM, the MCE parameters obtained as results of simulation for temperature-dependent magnetization data. Furthermore, the simulation shows that NaFeO2 nanoparticles have a prospective importance in magnetic refrigerants over a wide temperature range, including room temperature. This gives NaFeO2 nanoparticles potentially practical for MR. [ABSTRACT FROM AUTHOR]

The effect of Co content on magnetocaloric effect (MCE) in CoxZn1−xFe2O4 (CZF) with x = 0, 0.1, 0.2, 0.3, and 0.4, prepared by auto-combustion technique, has been investigated by phenomenological model. The results show that MCE for CZF nanoparticles is enhanced strongly with Co content especially for high Co content samples. In addition, MCE in CZF nanoparticles is tunable with Co content over a large operating temperature range. MCE of CZF nanoparticles are significantly better than MCE of Ni58Fe26Ga28, MnAs films, and Ge0.95Mn0.05. It is recommended that that MCE in CZF nanoparticles is favorable for magnetic refrigeration in a wide temperature range, including room temperature. [ABSTRACT FROM AUTHOR]

The effect of trivalent ions (Al3+, Bi3+, and Mn3+) substitutions on magnetocaloric effect (MCE) of M-type ferrite BaFe12O19 (BaM) has been investigated by a phenomenological model. It is shown that the presence of Al3+, Bi3+, and Mn3+ ions in BaM makes remarkable variations for MCE. It is concluded that MnBaFe11O19 is more practical than BaM, BiBaFe11O19, and AlBaFe11O19 due to a larger MCE, and its Curie temperature is closer to room temperature. MCE of BaM can be tuning with remarkable values by doping suitable ions. [ABSTRACT FROM AUTHOR]