COMPOSITE OF COBALT-NICKEL-IRON TERNARY ALLOY THIN FILM FOR MAGNET-INDUCTIVE NONDESTRUCTIVE SENSOR

摘要

A composite of Co-Ni-Fe ternary alloy thin film for a magnet-inductive nondestructive sensor in the present invention enables the magnet-inductive nondestructive sensor to have 1.9T of saturated magnetic flux density and 0.5Oe of coercivity by fabricating a Co-Ni-Fe ternary alloy thin film through electro-deposition, and to have high saturation magnetic flux density and low coercivity regardless of the minimal length of a magnetic core. For verifying the results calculated by modeling a single detection coil and micro thin film magnet-inductive sensor, the composite allows detection of metal defects, using a detection coil with a magnetic core which is able to easily detect a signal. In addition, the composite enables the magnet-inductive nondestructive sensor to minimize crystal magnetic anisotropy while maintaining saturated magnetic flux density as high as possible by putting a small amount of additive element into the base metal, Fe, for controlling the structure, and to maintain high magnetic permeability and low coercivity. Therefore, since detection of a micro crack 0.2mm from the excitation coil is enabled by embodying high magnetic density, the defects of the target object can be imaged through high resolution.