Effects of Dysprosium Substitution on the Structure, Magnetic Properties and Microwave Absorption Properties of Z-Type Hexaferrite Synthesized by Sol-Gel Method

Abstract

Rare earth Dysprosium doped Ba 3 Co 2 Fe 24-x Dy x O 41 (x = 0.00, 0.02, 0.04, 0.06, 0.08, 0.10) Z-type hexagonal ferrites were successfully prepared employing sol-gel method. The effects of Dy doping on the crystal structure, morphology, magnetic properties at room temperature, high-frequency electromagnetic properties and electromagnetic wave absorption performance of Co 2 Z hexaferrite were studied in detail. The results show that with the increase of rare earth Dy element doping amount, the value of saturation magnetization (M s ) is also increasing, and the value of coercivity of the sample is about 15 Oe, indicating that it has excellent soft magnetic properties. The high frequency magnetoelectric parameters were characterized. It with x = 0.04 exhibits the best microwave absorption performance when the thickness is t = 3.4 mm, and the reflection loss is -64.21 dB. When x = 0.08, the effective absorption bandwidth (RL ≤ -10 dB) of the material is between 4.33 GHz - 10.48 GHz, reaching 6.15 GHz. Compared with multi-element doping and multi-component composite materials, the preparation method of the wave absorbing material is simple and facile. The material has a potential application prospect in the field of microwave absorption in the GHz band.

Keywords: Z-type hexagonal ferrite, Rare earth substitution, High frequency microwave absorption, Effective absorption bandwidth