Synthesis and magnetization of a reentrant Ni-Mn thin-film system

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Abstract
Ni‐Mn disordered alloys in the bulk form are known to have a reentrant phase for a range of Mn percentages that are M was measured in an applied field of 100 G as the temperature was raised to 200 K. A peak in the magnetization was observed for all the films at about the same temperature. We found that this temperature represents the transition from a ferromagnetic‐like state to a spin‐glass state. The magnetic hysteresis loop obtained by cooling from 200 to 5 K in a 10‐kG field was also measured and found to be asymmetrical and displaced from the origin for every film. The displaced loops indicate that these films have a unidirectional anisotropy corresponding to the Dzyaloshinsky‐Morria interactions. The transition temperature from the ferromagnetic state to the paramagnetic state was determined by observing the temperature at which the thermoremanent magnetization vanished.