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Microwave Absorption Properties of Carbonyl Iron Particles Filled in Polymer Composites
New Phys.: Sae Mulli 2020; 70: 311~314
Published online April 29, 2020;
© 2020 New Physics: Sae Mulli.

Wongyu JANG, Shanigaram MALLESH, Ki Hyeon KIM*

Department of Physics, Yeungnam University, Gyeongsan 38541, Republic of Korea
Correspondence to:
; Revised March 13, 2020; Accepted March 14, 2020.
cc This is an open-access article distributed under the terms of the Creative Commons Attribution Non-Commercial License ( which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
We report the electromagnetic wave absorption performance of carbonyl iron-particles (CIP) magnetic fillers in a polydimethylsiloxane (PDMS) matrix prepared by using a doctor blade method. The X-ray diffraction and the field-emission scanning electron microscopy studies of the CIPs revealed a BCC crystal structure and an average diameter of 3 $\mu$m. For the CIPs, the saturation magnetization, M$_{S}$, was 205 emu/g, and the coercivity, H$_{C}$ was around 12 Oe. The microwave absorption properties were measured using a vector network analyzer in the frequency range from 0.1 to 18 GHz. We observed a systematic increase in the minimum reflection loss (RL) with increasing weight fraction of CIP fillers (46 wt\% to 72 wt%) in the PDMS matrix. The minimum RL was -27.5 dB at 14.6 GHz with a thickness of only 1.5 mm and an effective absorption bandwidth of up to 6.8 GHz (RL @ -10 dB). Therefore, the present study suggests that CIP magnetic fillers in a PDMS matrix are a good candidate for thin, broadband absorbing fillers.
PACS numbers: 75.50.$-$y, 75.50.Bb, 75.90.+w, 77.84.$-$s
Keywords: Microwave absorption, Carbonyl iron particles, Polydimethylsiloxane, Reflection loss, Bandwidth

May 2020, 70 (5)
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