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Figure of merit of X ‐type hexaferrite ( B a 2 C o 2 F e 28 O 46 ) for mobile antenna applications
Author(s) -
Lee Woncheol,
Hong YangKi,
Choi Minyeong,
Won Hoyun,
Lee Jaejin,
Jung MyungHwa,
Bae Seok
Publication year - 2018
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/mop.31053
Subject(s) - figure of merit , materials science , magnetometer , analytical chemistry (journal) , anisotropy , microwave , magnetization , nuclear magnetic resonance , dissipation factor , magnetic field , electrical engineering , chemistry , physics , optoelectronics , dielectric , optics , engineering , chromatography , quantum mechanics
We report a Ba 2 Co 2 Fe 28 O 46 (Co 2 X) hexaferrite, which has a high figure of merit (FOM = μ′ /tan δ μ ) over the frequency range from 800 MHz to 1 GHz. The Co 2 X hexaferrite was prepared by the conventional solid‐state reaction. The calcined and sintered Co 2 X hexaferrites were characterized with a vibrating sample magnetometer and an impedance analyzer for their static and dynamic magnetic properties. The sintered Co 2 X hexaferrite shows 67.3 emu/g of saturation magnetization, 10.5 kOe of anisotropy field, and 0.03 of low magnetic loss tangent with relatively high permeability of 2.07 at 1 GHz, resulting in FOM of 69. This is the highest FOM among the reported microwave magnetic materials over the frequency range from 800 MHz to 1 GHz, which has not been previously reported. Therefore, the developed Co 2 X hexaferrite is suitable for antenna applications at the low‐frequency bands of mobile wireless communications.