Significant high-frequency electromagnetic wave absorption performance of Ni2+x Mn1−x Ga alloys

Significant high-frequency electromagnetic wave absorption performance of Ni2+x Mn1−x Ga alloys The electromagnetic wave (EMW) absorption properties in Heusler-type ferromagnetic Ni2+x Mn1−x Ga alloys were systematically investigated. Significant electromagnetic absorption performance at 2.0–18.0 GHz was observed for Ni2+x Mn1−x Ga alloys. The values of the complex permittivity (ε r ) and permeability (μ r ), as well as the reflection loss (RL), peak frequency (f m) and bandwidth (Δf) of Ni2+x Mn1−x Ga can be effectively tuned by the alloy component (Ni/Mn ratio). The magnetic loss factor (tan δ μ ) shows pronounced multi-resonance behavior, and dielectric loss factor (tan δ ε ) has dramatic dielectric relaxation. The RL exceeding − 10 dB corresponding to 90% absorption of incident microwave can be achieved for the Ni2MnGa in a broad frequency range of 6.3–18.0 GHz together with the thickness from 1.66 to 4.75 mm. Particularly, the maximum RL reaches − 49.1 dB at 13.3 GHz with the thickness of 2.57 mm for Ni2MnGa. The present results indicated that the ferromagnetic Ni2+x Mn1−x Ga alloys could be attractive candidates for broadband and high-frequency EMW absorption. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Materials Science Springer Journals

Significant high-frequency electromagnetic wave absorption performance of Ni2+x Mn1−x Ga alloys

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Publisher
Springer US
Copyright
Copyright © 2018 by Springer Science+Business Media, LLC, part of Springer Nature
Subject
Materials Science; Materials Science, general; Characterization and Evaluation of Materials; Polymer Sciences; Continuum Mechanics and Mechanics of Materials; Crystallography and Scattering Methods; Classical Mechanics
ISSN
0022-2461
eISSN
1573-4803
D.O.I.
10.1007/s10853-018-2440-z
Publisher site
See Article on Publisher Site

Abstract

The electromagnetic wave (EMW) absorption properties in Heusler-type ferromagnetic Ni2+x Mn1−x Ga alloys were systematically investigated. Significant electromagnetic absorption performance at 2.0–18.0 GHz was observed for Ni2+x Mn1−x Ga alloys. The values of the complex permittivity (ε r ) and permeability (μ r ), as well as the reflection loss (RL), peak frequency (f m) and bandwidth (Δf) of Ni2+x Mn1−x Ga can be effectively tuned by the alloy component (Ni/Mn ratio). The magnetic loss factor (tan δ μ ) shows pronounced multi-resonance behavior, and dielectric loss factor (tan δ ε ) has dramatic dielectric relaxation. The RL exceeding − 10 dB corresponding to 90% absorption of incident microwave can be achieved for the Ni2MnGa in a broad frequency range of 6.3–18.0 GHz together with the thickness from 1.66 to 4.75 mm. Particularly, the maximum RL reaches − 49.1 dB at 13.3 GHz with the thickness of 2.57 mm for Ni2MnGa. The present results indicated that the ferromagnetic Ni2+x Mn1−x Ga alloys could be attractive candidates for broadband and high-frequency EMW absorption.

Journal

Journal of Materials ScienceSpringer Journals

Published: May 21, 2018

References

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