The influence of plastic deformation on magnetization processes in Ni<inf>3</inf>Fe

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The measurement of hysteresis loops was made in the long range ordered Ni-24.7 at% Fe single crystal which had plastically deformed, in order to study the role of dislocations in the Bloch wall movement. By tensile deformation a remarkable change was observed in coercive force H c and maximum permeability μ m ; H c increases in proportion to the square root of plastic strain e and becomes five times as much as before plastic deformation by 1% strain and μ m decreases to be about one fifth by the same strain, respectively. The change of H c and μ m recovered by annealing near the transition temperature of order-disorder. It was concluded from these experimental results that the atomic disordering introduced by plastic deformation acts as an obstacle in the Bloch wall movement rather than the internal stresses around dislocations. The relationship of H c and e is explained quantitatively according to the modified slip induced directional order model.

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