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Single- and double-layer microwave absorbers of cobalt ferrite and graphite composite at gigahertz frequency

Microwave absorbers of cobalt ferrite and graphite composite have been fabricated to investigate the broadening of absorption frequency by mixing small and large particles and comparing single- and double-layer composites in order to broaden the absorption frequency and to enhance multireflection an...

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Main Authors:	Ismail, Ismayadi, Matori, Khamirul Amin, Abbas, Zulkifly, Muhammad Zulkimi, Muhammad Misbah, Mohd Idris, Fadzidah, Mohd Zaid, Mohd Hafiz, Rahim, Nurfaziera, Hasan, Intan Helina, Woon, Hai Song
Format:	Article
Language:	English
Published:	Springer 2019
Online Access:	http://psasir.upm.edu.my/id/eprint/82172/1/Single-%20and%20double-layer%20microwave.pdf http://psasir.upm.edu.my/id/eprint/82172/ https://link.springer.com/article/10.1007/s10948-018-4749-x
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spelling	my.upm.eprints.821722021-08-20T22:59:00Z http://psasir.upm.edu.my/id/eprint/82172/ Single- and double-layer microwave absorbers of cobalt ferrite and graphite composite at gigahertz frequency Ismail, Ismayadi Matori, Khamirul Amin Abbas, Zulkifly Muhammad Zulkimi, Muhammad Misbah Mohd Idris, Fadzidah Mohd Zaid, Mohd Hafiz Rahim, Nurfaziera Hasan, Intan Helina Woon, Hai Song Microwave absorbers of cobalt ferrite and graphite composite have been fabricated to investigate the broadening of absorption frequency by mixing small and large particles and comparing single- and double-layer composites in order to broaden the absorption frequency and to enhance multireflection and scattering of electromagnetic wave. CoO and Fe2O3 precursors were mechanically alloyed and sintered at 800, 900, 1000 and 1100 ∘C in order to synthesise various particle sizes and shapes. A mixed sample of powders sintered at the above mentioned temperatures was also formed. The morphological, phase, and magnetic properties of these samples were studied. Two series of samples have been synthesised which were single- and double-layer composites. Single-layer composite consisted of mixed particles, and their thickness parameters were varied. Double-layer composite was also prepared with various particle sizes of CoFe2O4 as a layer and graphene as another layer. The effect of these layers as matching and absorbing layer was studied. The degree of crystallinity of CoFe2O4 was increased with increase of sintering temperature. Microstructural study showed the evolution of particle size and shape subjected to sintering temperature. Arrhenius plot showed two stages of growth process with activation energy calculated at 26.85 and 83.091 kJ/mol. The critical size of single domain of this sample plotted from the coercivity against particle size was 63.44 nm. Single-layer composite with mixed particle size was not able to show good electromagnetic (EM)-wave absorption; however double-layer composite showed good return loss. The mechanism of the EM-wave absorption of double-layer composite was discussed in this paper. Springer 2019 Article PeerReviewed text en http://psasir.upm.edu.my/id/eprint/82172/1/Single-%20and%20double-layer%20microwave.pdf Ismail, Ismayadi and Matori, Khamirul Amin and Abbas, Zulkifly and Muhammad Zulkimi, Muhammad Misbah and Mohd Idris, Fadzidah and Mohd Zaid, Mohd Hafiz and Rahim, Nurfaziera and Hasan, Intan Helina and Woon, Hai Song (2019) Single- and double-layer microwave absorbers of cobalt ferrite and graphite composite at gigahertz frequency. Journal of Superconductivity and Novel Magnetism, 32 (4). pp. 935-943. ISSN 1557-1939; ESSN: 1557-1947 https://link.springer.com/article/10.1007/s10948-018-4749-x 10.1007/s10948-018-4749-x
institution	Universiti Putra Malaysia
building	UPM Library
collection	Institutional Repository
continent	Asia
country	Malaysia
content_provider	Universiti Putra Malaysia
content_source	UPM Institutional Repository
url_provider	http://psasir.upm.edu.my/
language	English
description	Microwave absorbers of cobalt ferrite and graphite composite have been fabricated to investigate the broadening of absorption frequency by mixing small and large particles and comparing single- and double-layer composites in order to broaden the absorption frequency and to enhance multireflection and scattering of electromagnetic wave. CoO and Fe2O3 precursors were mechanically alloyed and sintered at 800, 900, 1000 and 1100 ∘C in order to synthesise various particle sizes and shapes. A mixed sample of powders sintered at the above mentioned temperatures was also formed. The morphological, phase, and magnetic properties of these samples were studied. Two series of samples have been synthesised which were single- and double-layer composites. Single-layer composite consisted of mixed particles, and their thickness parameters were varied. Double-layer composite was also prepared with various particle sizes of CoFe2O4 as a layer and graphene as another layer. The effect of these layers as matching and absorbing layer was studied. The degree of crystallinity of CoFe2O4 was increased with increase of sintering temperature. Microstructural study showed the evolution of particle size and shape subjected to sintering temperature. Arrhenius plot showed two stages of growth process with activation energy calculated at 26.85 and 83.091 kJ/mol. The critical size of single domain of this sample plotted from the coercivity against particle size was 63.44 nm. Single-layer composite with mixed particle size was not able to show good electromagnetic (EM)-wave absorption; however double-layer composite showed good return loss. The mechanism of the EM-wave absorption of double-layer composite was discussed in this paper.
format	Article
author	Ismail, Ismayadi Matori, Khamirul Amin Abbas, Zulkifly Muhammad Zulkimi, Muhammad Misbah Mohd Idris, Fadzidah Mohd Zaid, Mohd Hafiz Rahim, Nurfaziera Hasan, Intan Helina Woon, Hai Song
spellingShingle	Ismail, Ismayadi Matori, Khamirul Amin Abbas, Zulkifly Muhammad Zulkimi, Muhammad Misbah Mohd Idris, Fadzidah Mohd Zaid, Mohd Hafiz Rahim, Nurfaziera Hasan, Intan Helina Woon, Hai Song Single- and double-layer microwave absorbers of cobalt ferrite and graphite composite at gigahertz frequency
author_facet	Ismail, Ismayadi Matori, Khamirul Amin Abbas, Zulkifly Muhammad Zulkimi, Muhammad Misbah Mohd Idris, Fadzidah Mohd Zaid, Mohd Hafiz Rahim, Nurfaziera Hasan, Intan Helina Woon, Hai Song
author_sort	Ismail, Ismayadi
title	Single- and double-layer microwave absorbers of cobalt ferrite and graphite composite at gigahertz frequency
title_short	Single- and double-layer microwave absorbers of cobalt ferrite and graphite composite at gigahertz frequency
title_full	Single- and double-layer microwave absorbers of cobalt ferrite and graphite composite at gigahertz frequency
title_fullStr	Single- and double-layer microwave absorbers of cobalt ferrite and graphite composite at gigahertz frequency
title_full_unstemmed	Single- and double-layer microwave absorbers of cobalt ferrite and graphite composite at gigahertz frequency
title_sort	single- and double-layer microwave absorbers of cobalt ferrite and graphite composite at gigahertz frequency
publisher	Springer
publishDate	2019
url	http://psasir.upm.edu.my/id/eprint/82172/1/Single-%20and%20double-layer%20microwave.pdf http://psasir.upm.edu.my/id/eprint/82172/ https://link.springer.com/article/10.1007/s10948-018-4749-x
_version_	1709668998414598144
score	13.211869

Single- and double-layer microwave absorbers of cobalt ferrite and graphite composite at gigahertz frequency

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