Amorphization of thin supermalloy films Ni79Fe17Mo4 with oxygen during magnetron sputtering

Naboko, Andrei S.; Maklakov, Sergey S.; Bobrovskii, Stanislav Y.; Polozov, Viktor I.; Zezyulina, Polina A.; Osipov, Alexey V.; Ryzhikov, Ilya A.; Rozanov, Konstantin N.; Похолок, К. В.; Iakubov, I. T.; Lagarkov, A. N.

doi:10.1016/j.jallcom.2020.157097

Cited by 2 publications

(2 citation statements)

References 92 publications

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“…To optimize their permeability, precise heat treatment is required, involving specific temperatures and controlled cooling rates. Supermalloys may cost more than permalloys and silicon steels, but their exceptional properties make them a promising alternative for high-frequency electrical machines, where their superior performance justifies the investment [ 144 , 145 , 146 , 147 , 148 ].…”

Section: Fe–nimentioning

confidence: 99%

Recent Advances in Additive Manufacturing of Soft Magnetic Materials: A Review

Vargas

Stornelli

Folgarait³

et al. 2023

Materials

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Additive manufacturing (AM) is an attractive set of processes that are being employed lately to process specific materials used in the fabrication of electrical machine components. This is because AM allows for the preservation or enhancement of their magnetic properties, which may be degraded or limited when manufactured using other traditional processes. Soft magnetic materials (SMMs), such as Fe–Si, Fe–Ni, Fe–Co, and soft magnetic composites (SMCs), are suitable materials for electrical machine additive manufacturing components due to their magnetic, thermal, mechanical, and electrical properties. In addition to these, it has been observed in the literature that other alloys, such as soft ferrites, are difficult to process due to their low magnetization and brittleness. However, thanks to additive manufacturing, it is possible to leverage their high electrical resistivity to make them alternative candidates for applications in electrical machine components. It is important to highlight the significant progress in the field of materials science, which has enabled the development of novel materials such as high-entropy alloys (HEAs). These alloys, due to their complex chemical composition, can exhibit soft magnetic properties. The aim of the present work is to provide a critical review of the state-of-the-art SMMs manufactured through different AM technologies. This review covers the influence of these technologies on microstructural changes, mechanical strengths, post-processing, and magnetic parameters such as saturation magnetization (MS), coercivity (HC), remanence (Br), relative permeability (Mr), electrical resistivity (r), and thermal conductivity (k).

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Section: Fe–nimentioning

confidence: 99%

Recent Advances in Additive Manufacturing of Soft Magnetic Materials: A Review

Vargas

Stornelli

Folgarait³

et al. 2023

Materials

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show abstract

“…A change in Ti concentration in M-type hexagonal ferrite composites results in a low-frequency shift of the natural ferrimagnetic resonance frequency [9]. In ferromagnetic films, even grain growth, caused by an increase in oxygen concentration during reactive sputtering of permalloy films [10] as well as post-production annealing [11], can increase both static and dynamic magnetic properties due to a change in chemical and magnetic structure. Therefore, a consideration of the dependencies of microwave properties as a function of the chemical composition of compounds can be carried out while keeping other structural features (morphology, structure, and size) unchanged [12].…”

Section: Introductionmentioning

confidence: 99%

Influence of Hydrogen Reduction Stage Conditions on the Microwave Properties of Fine Iron Powders Obtained via a Spray-Pyrolysis Technique

et al. 2023

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The relationship between the chemical purity of one-size particles and microwave properties in ferromagnetic materials is not clearly studied. Ferromagnetic nanostructured iron powders were synthesized from iron nitrate solution using ultrasonic spray-pyrolysis and then reduced in H2 flow at 350, 400, 450, and 500 °C. A rise in the concentration of solutions of a precursor from 10 to 20 wt. % led to an increase in mean particle size. The interrelationship was studied between chemical composition and the microwave dispersion of the powders obtained. An increase in the temperature of reduction changes the chemical composition and increases the amplitude of complex microwave permeability, which was studied using solid-state physics methods (XRD, STA, SEM, and VNA). It was found that annealing at 400 °C is the optimal treatment that allows the production of iron powders, consisting of about 90% of α-Fe phase, possessing a particle surface with low roughness and porosity, and demonstrating intense microwave absorption. Annealing at a higher temperature (500 °C) causes an even higher increase in permeability but leads to the destruction of nanostructured spheres into smaller particles due to grain growth. This destruction causes an abrupt increase in permittivity and therefore significantly reduces potential applications of the product. The insight into chemical–magnetic relationships of these materials enhances the data for design applications in magnetic field sensing.

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Amorphization of thin supermalloy films Ni79Fe17Mo4 with oxygen during magnetron sputtering

Cited by 2 publications

References 92 publications

Recent Advances in Additive Manufacturing of Soft Magnetic Materials: A Review

Recent Advances in Additive Manufacturing of Soft Magnetic Materials: A Review

Influence of Hydrogen Reduction Stage Conditions on the Microwave Properties of Fine Iron Powders Obtained via a Spray-Pyrolysis Technique

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