Efficiency of Magnetostatic Protection Using Nanostructured Permalloy Shielding Coatings Depending on Their Microstructure.

Tatiana Zubar,Karin Leistner,Artem Kozlovskiy,Valery Fedosyuk,Daria Tishkevich,Tatiana Vershinina,Maxim Zdorovets,Egor Kaniukov,Kornelius Nielsch,Anna Kotelnikova,Oleg Kanafyev,Sergey Grabchikov,Maksim Kutuzau,Alex Trukhanov

doi:10.3390/nano11030634

Abstract

The effect of microstructure on the efficiency of shielding or shunting of the magnetic flux by permalloy shields was investigated in the present work. For this purpose, the FeNi shielding coatings with different grain structures were obtained using stationary and pulsed electrodeposition. The coatings’ composition, crystal structure, surface microstructure, magnetic domain structure, and shielding efficiency were studied. It has been shown that coatings with 0.2–0.6 µm grains have a disordered domain structure. Consequently, a higher value of the shielding efficiency was achieved, but the working range was too limited. The reason for this is probably the hindered movement of the domain boundaries. Samples with nanosized grains have an ordered two-domain magnetic structure with a permissible partial transition to a superparamagnetic state in regions with a grain size of less than 100 nm. The ordered magnetic structure, the small size of the domain, and the coexistence of ferromagnetic and superparamagnetic regions, although they reduce the maximum value of the shielding efficiency, significantly expand the working range in the nanostructured permalloy shielding coatings. As a result, a dependence between the grain and domain structure and the efficiency of magnetostatic shielding was found.

Highlights

We studied the effect of permalloy structure on the efficiency of shielding of the magnetic flux
Theresults resultsof of the the analysis analysis by by energy-dispersive X-ray spectroscopy spectroscopy are presented in
A set of permalloy coatings protecting against a permanent magnetic field was obtained using stationary and pulsed electrodeposition with a variable pulse duration (1, 0.1, and 0.01 s)

Summary

Introduction

The issue of creating effective electromagnetic shields for protection from both magnetostatic fields and electromagnetic radiation is critically essential nowadays [1,2,3,4,5,6]. The level of the electromagnetic background, caused by the rapid development of electrical, radio-electronic, transport, information, and military technology, has significantly increased, the range of used frequencies of electromagnetic radiation has expanded, and their amplitude has increased. The development of radio-electronic and information technology, research, and intelligent complexes is moving toward minimizing the mass and dimensions as well as increasing the density of their arrangement.

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Discussion

Conclusion