Abstract
In this work is investigated structural and magnetic properties of ferromagnetic Mn 1 - x Al 1 - y Ni x + y alloys in the κ phase which has a B2 (CsCl-type) structure. The Curie temperatures are above room temperature and decrease with the substitution of Ni for Mn. The magnetic measurements indicate the existence of ferrimagnetism originated from Mn atoms which carry unequal and opposite magnetic moments in different sublattices. A larger average magnetic moment is observed in the Ni-doped system, as compared to the Fe-system, which is due to the formation of larger moment on Mn atoms at the cube corners.
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