Tuning microwave absorption properties of melt-spun FeSiCo alloys based on the addition of rare earth Sm
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Tuning microwave absorption properties of melt-spun FeSiCo alloys based on the addition of rare earth Sm Xiaoman Liu1, Guozhi Xie1,* 1
, Ningyan Xie1, Xin Gao1, and Jing Chen1
College of Electronic and Optical Engineering & College of Microelectronics, Nanjing University of Posts and Telecommunications, Nanjing 210023, People’s Republic of China
Received: 2 June 2020
ABSTRACT
Accepted: 21 August 2020
The effects of Sm-doped on microwave absorption properties of melt-spun FeSiCo alloys were studied in this paper. The composite alloys were characterized by XRD, SEM, VSM, and vector network analysers (VNA). The phase identification shows that only a-Fe(Co) phase was observed for all samples. SEM images have revealed that the morphology of all powders were flaky shape with different particle size. The values of saturation magnetization (Ms) and coercivity (Hc) increased with the increase of Sm-doping content. In addition, the minimal reflection loss ((RL)min) is - 7.96 dB at 1.7 GHz with the thickness of 3 mm for Sm1Fe79Si10Co10 sample. The results reveal that the addition of Sm can improve the microwave absorption property of FeSiCo alloys.
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Springer Science+Business
Media, LLC, part of Springer Nature 2020
1 Introduction It is well known that with the extensive application of electronic devices in gigahertz (GHz) range, the electromagnetic pollution has become a serious problem which cannot be ignored [1–3]. Therefore, microwave absorbers have aroused due to attention at home and abroad [4, 5]. Metal soft magnetic materials had been especially concerned due to their good temperature stability, high saturated flux magnetic density, and high permeability [6, 7]. Furthermore, flaky metal soft magnetic powders are free from such Snoek’s limit in GHz [8]. FeSi alloys can act as low field sensors in microwave and radio frequency regions because of their high saturation magnetization, high permeability, low coercivity, and zero magnetostriction [9–11].
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https://doi.org/10.1007/s10854-020-04306-6
Meanwhile, FeSi particles have attracted considerable interest for their large values of Snoek’s limit [12]. Compared with other Fe-based powders, FeSi alloy powders have higher resistivity in GHz, which is beneficial to suppress unfavorable eddy current effect [13]. Moreover, the absorption properties of FeSi alloys can be improved by elements doping. It is reported that the addition of Cr can decrease the magnetic anisotropy and brittleness of Fe-based alloys, and excellent absorption performance of FeSiCr particles can be achieved [14, 15]. Omari et al. [16] also reported that FeSiCo alloys have stronger exchange interaction which leads to higher Curie temperature. Besides, the addition of rare earth to the electromagnetic microwave absorbing materials can widen the bandwidth and lower the matching thickness
J Mater Sci: Mater Electron
The pure Sm block (99.0 wt%), high-purity iron bar (99.9 wt%), pure cobalt plate (99.8 wt%), and FeSi alloy (Si 70 wt%) and
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