期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 867, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2021.159075
关键词
Magnetodielectric; Permeability; Permittivity; Electromagnetic wave absorption; FeSiAl
资金
- Ministry of Trade, Industry & Energy (MOTIE, Korea) under Industrial Technology Innovation Program [10063274]
- National Research Foundation of Korea (NRF) - Korea government (MSIT) [NRF 2017R1A5A1015365]
- Creative Materials Discovery Program through the National Research Foundation of Korea (NRF) - Ministry of Science and ICT [2020M3D1A1110522]
- National Research Council of Science and Technology (NST) grant [CAP-16-01-KIST]
- KIST Institutional Program
- National Research Foundation of Korea [2020M3D1A1110522] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
The study demonstrates a new method for preparing electromagnetic absorption films by mixing ferroelectric BaTiO3 particles into a soft magnetic FeSiAl flake composite. This method not only enhances the dielectric constant and increases the effective magnetic permeability, but also achieves perfect absorption of electromagnetic waves at a very thin thickness.
The need to block specific frequencies of electromagnetic (EM) waves in complex communication systems such as in wireless autonomous vehicles with EM absorption films is becoming increasingly important. Increasing safety requirements necessitate that the films operate with highly precise and accurate frequency selectivity, while commercial specifications demand extremely small thicknesses. Herein, we demonstrate that the mixing of ferroelectric BaTiO3 particles into a soft magnetic FeSiAl flake composite, followed by heat-pressing, not only enhances the electric permittivity,., which can be further tuned by oxygen vacancy engineering, but also increases the effective magnetic permeability, mu, by geometrically-induced suppression of eddy current losses and stressed-induced enhancements in the saturation magnetization. The enhanced refractive index (root epsilon mu) in conjunction with the dielectric and magnetic loss leads to perfect absorption at a unique thickness that is similar to 15-44% thinner than its magnetic counterpart and an order of magnitude less than a quarter wavelength. These results pave the way for developing highly precise frequency selective absorption films with subwavelength thicknesses, and also provide strategies for reducing the soft magnetic material content in high-frequency ferromagnetic applications for decreased materials cost and weight. (C) 2021 Elsevier B.V. All rights reserved.
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