Hexaferrite/nickel Ferrite/epoxy Composite as an Absorber of Electromagnetic Waves in the 2-18 GHz Range
Yohanes Edi Gunanto (1,*) Maya Puspitasari Izaak (1), Henni Sitompul (1), Yosef Sarwanto (2) and Wisnu Ari Adi (2)

(1) Department of Physics Education, Faculty of Education, University of Pelita Harapan, Karawaci, Tangerang 15811, Indonesia
*yohanes.gunanto[at]uph.edu
(2) Center for Research and Technology of Advanced Materials, National Research and Innovation Agency, Tangerang Selatan 15314, Indonesia

Abstract

The rapid development of wireless technology not only has a positive impact but also has a negative impact. The emergence of electromagnetic waves generated from the components of these electronic devices can interfere with and endanger human health. In this case, Barium-strontium-hexaferrite/nickel ferrite/epoxy composite is used as an electromagnetic wave absorber in the frequency range of 2-18 GHz. Ba0.6Sr0.4Fe11.75Al0.25O19 and NiFe2O4 nanoparticles were prepared by solid-state reaction method using milling, respectively. The composite sample Ba0.6Sr0.4Fe11.75Al0.25O19/ NiFe2O4 has a hexagonal/cubic crystal structure with an average particle size of 250 nm with a heterogeneous shape. The crystal structure and the formed phase were characterized using an X-ray diffractometer, while the surface morphology was characterized by scanning electron microscopy (SEM). The magnetization properties at room temperature were characterized using a vibrating sample magnetometer (VSM) respectively. The ability to absorb microwaves in the frequency range of 2-18 GHz was characterized using a vector network analyzer (VNA). The saturation magnetic Ms and the coercive field Hc at room temperature were 46,037 emu/g and 0.962 kOe, respectively. The largest RLmin value is -32.89 dB at a frequency of 5.78 GHz with a bandwidth of 2.56 GHz.

Keywords: absorption- composite- hexaferrite- microwave- nickel-ferrite

Topic: Magnetic materials