Microwave absorption performances of planar anisotropy ferromagnetic Pr2Co17 flakes prepared by high-energy ball-milling process

摘要

Planar anisotropy ferromagnetic Pr2Co17 flakes were synthesized by combining vacuum arc-melting method and high-energy ball-milling process. The saturated magnetization (M-s) and coercive force (H-c) of Pr2Co17 are 111 emu g(similar to 1) and 148 Oe, respectively. The high-frequency electromagnetic properties were discussed in detail. The microwave-absorption results show that the RLs (reflection loss values) below - 10 dB are obtained in the range of 7.6-11.8 GHz at the thickness of 2.5 mm, which covers most of the X-band (8-12 GHz). For a given matching thickness of 1.5 mm, the RLs below -10 dB are obtained in 12.3-16.2 GHz, which covers most of the Ku-band (12-18 GHz). A delta function is used to evaluate the impendence matching degree. This work indicates that the Pr2Co17 submicron flakes possess strong microwave absorption at a broad bandwidth, thus are promising for the practical applications in microwave-absorption field.