Metacomposite characteristics and their influential factors of polymer composites containing orthogonal ferromagnetic microwire arrays

Abstract

The microwave properties of glass-fibers reinforced polymer composite embedded with an orthogonal array of Fe 77 Si 10 B 10 C 3 microwires have been investigated. The composites containing orthogonal wire arrays display a remarkable transmission window in the frequency band of 1 to 6GHz under zero external magnetic field indicating an intrinsic double-negative-index characteristic.The polymer matrices have proved to exert a synergistic effect on the microwave properties, which is responsible for the disappearance of the transmission windows when E k is perpendicular to the glass fiber direction. The plasma frequency of the orthogonal microwire array composite is higher than that of the parallel microwire array with identical wire spacing; this could be attributed to the enhanced microwire-wave interaction induced by the axial electrical components on the additional layer of perpendicular wires. All these features make this new kind of orthogonal microwire composites promising for potential cloaking and sensing applications.

In-situ microwave characterization of ferromagnetic microwires-filled polymer composites: A mini review

“…Based on this perspective, fruitful experimental results and their underlying physics pertinent to ferromagnetic microwire composites have been systematically studied associated with other influential roles at play, for instance, the wire volume fraction [10], wire length [11] and polymer matrices [12]. From all these exciting studies, microwire composites are believed to be used in potential applications such as microwave devices and sensors in the future.…”

“…Based on this perspective, fruitful experimental results and their underlying physics pertinent to ferromagnetic microwire composites have been systematically studied associated with other influential roles at play, for instance, the wire volume fraction, 7 wire length 8 and polymer matrices. 9 From all these exciting studies, this nascent research area is confirmed to have great scientific value and microwire composites are believed to be used in potential applications such as microwave devices and sensors in the future. It is therefore of significant interest to dispose a panorama on the microwire composites to summarize the on-going research on their fabrication, characterization and perspective application from the standpoint of engineering.…”

In-plane omnidirectional magnetic field sensor based on Giant Magneto Impedance (GMI)

“…Glass coated amorphous microwires have been intensively studied due to its outstanding magnetic properties, as giant magnetoimpedance (GMI) [1][2][3][4][5][6][7][8][9] or its absorption properties at microwave frequencies [10][11][12][13][14][15][16][17][18][19]. The GMI effect is related to the change of the skin depth on the microwire due to strong changes of the dynamic circular permeability [20,21].…”

Microwires enabled metacomposites towards microwave applications

“…As discussed in previous work, the orthogonal microwire array can generate DNG features in the microwire-polymer system due to the significantly improved fp arisen from the additional dielectric contribution provided by the vertical wires. 29 However, it remains an issue to tune the identified transmission windows in such orthogonal structure. With reference to Fig.…”

“…This small deviation can be attributed to the non-uniform distribution of frozen-in stresses during the fabrication of the microwires, 32,38 as well as the residual stress distribution at the microwire/polymer interface. 29 Co-based microwires have a much smaller NFMR frequency compared to Febased ones, but the position of the resonance peak can be effectively tuned by the external magnetic bias. 13,15 However, the fact that the position of transmission window is not affected by the presence of external fields implies that the left-hand behavior is independent of the intrinsic properties of Co-based microwires at the low frequencies regime (Fig.…”