The effect of Co content on magnetocaloric effect (MCE) in Co_xZn_1−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 Ge_0.95Mn_0.05. It is recommended that that MCE in CZF nanoparticles is favorable for magnetic refrigeration in a wide temperature range, including room temperature.

中文翻译：

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Co x Zn 1−x Fe 2 O 4中增强热磁性能的研究

研究了Co含量对 通过自动燃烧技术制备的x = 0、0.1、0.2、0.3和0.4的Co _x Zn _{1- x} Fe ₂ O ₄（CZF）中磁热效应（MCE）的影响。现象学模型。结果表明，CZF纳米颗粒的MCE随着Co含量的增加而大大增强，特别是对于高Co含量的样品。此外，CZF纳米颗粒中的MCE在较大的工作温度范围内具有可调节的Co含量。CZF纳米颗粒的MCE明显优于Ni ₅₈ Fe ₂₆ Ga ₂₈，MnAs膜和Ge _0.95 Mn _0.05。建议CZF纳米颗粒中的MCE有利于在包括室温在内的宽温度范围内进行磁制冷。