Multiferroic and enhanced microwave absorption induced by complex oxide interfaces

Abstract

NiFe 2 O 4 (NFO)/ZnO composite nanoparticles with different ZnO components were investigated, which were prepared by a simple wet chemical route method. The magnetoelectric coupling between magnetostriction from NFO and piezoelectricity from ZnO was induced by the surface coating NFO nanoparticles of ZnO layer, NFO/ZnO composite showed ferroelectric properties and the remanent electric polarization reached 0.08 µC/cm. Moreover, the changes of resistance at different room temperatures reached about 2% under 3 T magnetic fields comparing with that of zero magnetic fields. Furthermore, multiferroic NFO/ZnO resulted in enhancement of microwave absorption due to magnetoelectric coupling.

Broadband microwave absorption properties of polyurethane foam absorber optimized by sandwiched cross-shaped metamaterial

“…Here S 1 represents the PUFA 2 , S 2 the combined sample of PUFA 1 and PUFA 2 , S 3 the combined sample of PUFA 2 and CMMA, and S 4 the combined sample of PUFA 1 , PUFA 2 , and CMMA. Reflection loss of S 1 is lower than −10 dB in a frequency range from 11.75 GHz to 16.60 GHz with an effective bandwidth of 4.85 GHz. To further broaden the bandwidth of PUFA 2 , two available methods are used.…”

“…[8][9][10][11][12][13][14] The polyurethane foam absorber (PUFA) has become an efficient absorber to the incident radar wave in 8 GHz-12 GHz or 12 GHz-18 GHz. [15][16][17][18] However, it is still difficult for PUFA to possess good microwave absorbing ability in the whole 8 GHz-18 GHz range. Strong electromagnetic loss and good impedance matching in a range of 8 GHz-18 GHz are still troublesome problems.…”