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Effect of Fe doping on magnetic and magnetothermal properties of mn5 − xfexge3

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Document pages: 7 pages

Abstract: The magnetic and magnetothermal properties of a series of micro doped compounds with D88 hexagonal crystal structure at room temperature were studied. For all iron concentrations, the alloys are ferromagnetic and undergo a secondary ferromagnetic paramagnetic transition near room temperature. Although a small amount of Fe doping has little effect on the ferromagnetic transition temperature, the changes of saturation magnetization and magnetic anisotropy are observed. Because all compounds exhibit almost the same ~7 magnetic entropy change   J kg   K and the field is changed to 50   kOe. However, with Fe doping, the refrigerant capacity increases, and the values are as high as 108.5   J kg and 312   J kg   kOe and 50   of the observed 20 magnetic field change, respectively. As second-order phase transition materials, the compounds are not subject to the various drawbacks associated with first-order phase transition materials yet exhibit favorable magnetocaloric effects.

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