Strong microwave absorption of Fe-deficient SrFe9.4Cu0.8Sn0.5O19-d with enhanced permittivity and ferromagnetic resonance by high annealing temperature

Author:

Liu Bo1ORCID,Li Lun1ORCID,Li Kewei2ORCID,Wang Xiaoqiong1ORCID,Tan Yukun1,Zhao Shifeng1ORCID,Zhou Wenping1ORCID,Xing Shuya1ORCID,Yang Wenyun2ORCID,Liu Shunquan2,Chang Hong1ORCID

Affiliation:

1. School of Physical Science and Technology, Inner Mongolia University 1 , Hohhot, China

2. School of Physics, Peking University 2 , Beijing, China

Abstract

The oxygen environments of Fe+3-δ ions determine the magnetic anisotropy of M-type ferrites. The high annealing temperature increases the oxygen content and decreases the lattice strain in M-type SrFe9.4Cu0.8Sn0.5O19-d ferrites. The anisotropic field and the coercive field decrease with the increasing annealing temperature. Annealed at 1400 °C, a ferromagnetic resonance is observed at the frequency above 9.5 GHz, with the real part having a peak and the imaginary part of the permeability having a high plateau over a wide frequency range. It enables the microwave energy' dissipation by the magnetic loss. Furthermore, the extra oxygen ions ease up the dipole polarizations' rotation and significantly increase the dielectric permittivity. At thin thickness of 1.3 mm, the effective absorption bandwidth (RL≤−10 dB) of SrFe9.4Cu0.8Sn0.5O19-d annealed at 1400 °C is 7.1+ GHz from 10.9 to 18+ GHz. SrFe9.4Cu0.6Sn0.6O19-d annealed at 1400 °C has the microwave absorption bandwidth of 8.8 GHz from 9.2 to 18+ GHz at 1.6 mm. Both are very promising microwave absorbing materials.

Funder

National Natural Science Foundation of China

Key technology research and development of Inner Mongolia

Publisher

AIP Publishing

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