Change of magnetic properties due to plastic deformation in Ni{sub}50Cu{sub}50 alloy

摘要

The influence of plastic deformation on the magnetic properties has been studied in Ni{sub}50Cu{sub}50 alloy. The magnetism of this alloy before and after plastic deformation is analyzed by the self-consistent renormalization (SCR) theory of spin fluctuation. The spontaneous magnetization at OK decreases considerably as a result of plastic deformation. At the same time the Curie temperature also becomes lowes. This phenomenon shows the existence of atomically ordered state in this alloy. The ferromagnetic state changes to paramagnetic along the antiphase boundary between superpartial dislocations even at 4.2K. The paramagnetic state increases In proportion to the dislocation density. The paramagnetic state extent in the long distance from the APB. The paramagnetic APB ribbon exerts an Influence to the Curie temperature. The magnetism in the Ni{sub}50Cu{sub}50 alloy, including the plastically deformed ones, can he explained by the SCR theory of spin fluctuation. The dislocations are observed by the electron microscopy.