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One important aspect of the magneto-structural transition in MnCoGe andrelated materials is the reduction in saturation magnetization from theorthorhombic to the hexagonal phase. Here, by combining an element specificmagnetization probe such as x-ray magnetic circular dichroism and bandstructure calculations, we show that the magnetic moment instability betweenorthorhombic and hexagonal structures originates from a reduction in the Mnsub-lattice magnetization. The consequences of the moment instability for themagnetocaloric effect are discussed.

Microscopic mechanism of the giant magnetocaloric effect in MnCoGe alloys probed by XMCD