Ni-Fe Alloys as Perspective Materials for Highly Efficient Magnetostatic Shielding

摘要

Magnetostatic shields based on Ni-Fe alloys were obtained via electrochemistry method with different thickness of partial magnetic layers. The experimental researches of the magnetic properties and magnetostatic shielding effectiveness of the single-layer and malty-layer cylindrical sample of the shields based on the electrodeposited Ni_(80)Fe_(20) and Ni_(50)Fe_(50) alloy are carried out. It has been shown that shields of gradient type (200 μm Ni_(50)Fe_(50)+200 μm Ni_(80)Fe_(20) and 100 μm Ni_(50)Fe_(50)+300 μm Ni_(80)Fe_(20)) containing layers with different values of saturation induction (B_s) have a higher shielding efficiency than shield of a symmetric type (400 μm Ni_(50)Fe_(50) and 400 μm Ni_(80)Fe_(20)). Maximum efficiency of magnetostatic shielding has been noted for 200 μm Ni_(50)Fe_(50)+ 200 μm Ni_(80)Fe_(20) sample. It opens wide prospects for practical application for protection of the microelectronics devices against permanent magnetic fields.