We utilized magnetic fields as an efficient tool to manipulate the orientation and electromagnetic properties of graphite micro-flakes(GMFs).As a result,we successfully developed a GMF double-layer homo-structure,whic...We utilized magnetic fields as an efficient tool to manipulate the orientation and electromagnetic properties of graphite micro-flakes(GMFs).As a result,we successfully developed a GMF double-layer homo-structure,which shows excellent electromagnetic absorption properties.By tuning the direction of a small magnetic field(850 G),vertical and horizontal aligned GMFs are produced.Their electromagnetic parameters are effectively tailored by this magneto-orientation effect,and the vertical and horizontal aligned GMFs achieve good results in terms of impedance matching and microwave absorption.With the combination of these two magneto-orientated layers,vertically oriented as the surficial impedance matching layer and horizontally oriented as the inner loss layer,we design a GMF-based double-layer homo-structure.After thickness optimization,-38.2 d B minimum reflection loss and 6.4 GHz(11.6–18.0 GHz)absorption bandwidth are achieved.Our findings further emphasize the importance of material orientation freedom and provide a magneto-strategy to design multiple-layer structures and to produce high-performance microwave devices.展开更多
基金supported by the National Key R&D Program of China(Grant No.2021YFA1600203)the National Natural Science Foundation of China(Grant Nos.U2032218,11904116,and 12111530283)+1 种基金the Plan for Major Provincial Science&Technology Project(Grant No.202003a05020018)supported by the High Magnetic Field Laboratory of Anhui Province。
文摘We utilized magnetic fields as an efficient tool to manipulate the orientation and electromagnetic properties of graphite micro-flakes(GMFs).As a result,we successfully developed a GMF double-layer homo-structure,which shows excellent electromagnetic absorption properties.By tuning the direction of a small magnetic field(850 G),vertical and horizontal aligned GMFs are produced.Their electromagnetic parameters are effectively tailored by this magneto-orientation effect,and the vertical and horizontal aligned GMFs achieve good results in terms of impedance matching and microwave absorption.With the combination of these two magneto-orientated layers,vertically oriented as the surficial impedance matching layer and horizontally oriented as the inner loss layer,we design a GMF-based double-layer homo-structure.After thickness optimization,-38.2 d B minimum reflection loss and 6.4 GHz(11.6–18.0 GHz)absorption bandwidth are achieved.Our findings further emphasize the importance of material orientation freedom and provide a magneto-strategy to design multiple-layer structures and to produce high-performance microwave devices.
