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 of Materials Science – Springer Journals
Published: May 21, 2018
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