DOI: 10.4150/KPMI.2009.16.4.291 ù Fe 73 yw w x q p ½ Á½ Á Á * w ù lœw Electomagnetic Wave Absoption Popeties of Fe 73 -Based Nanocystalline Soft Magnetic Powde Composite Mixed with Chacoal Powde Sun-I Kim, Mi-Rae Kim, Keun Yong Sohn and Won-Wook Pak* Depatment of Nano System Engineeing, Inje Univesity, 607 Obang-dong Gimhae, Gyungnam, 621-749 Republic of Koea (Received July 3, 2009; Revised July 22, 2009; Accepted August 5, 2009) Abstact The electomagnetic wave absoption sheets wee fabicated by mixing of Fe 73 nanocystalline soft magnetic powde, chacoal powde and polyme based binde. The complex pemittivity, complex pemeability, and scatteing paamete have been measued using a netwok analyze in the fequency ange of 10 MHz~10 GHz. The esults showed that complex pemittivity of sheets was lagely dependent on the fequency and the amount of chacoal powde : The pemittivity was impoved up to 100 MHz, howeve the value was deceased above 1 GHz. The powe loss of electomagnetic wave absoption data showed almost the same tendency as the esults of complex pemittivity. Howeve, the complex pemeability was not lagely affected by the fequency, and the values wee deceased with the addition of chacoal powde. Based on the esults, it can be summaized that the addition of chacoal powde was vey effective to impove the EM wave absoption in the fequency ange of 10 MHz~1 GHz. Keywods : Electomagnetic wave absobe, FeSiBNbCu, Chacoal, Complex pemittivity 1.»» w š j» x y š, q ƒwš. w q»» w» q w j ù ü y ù s w s k [1-2].»q w ƒ» ü w œ ³ (KS) w q w t w w t w ³ wš, q ww ³ (EMI, electomagnetic inteface) l q j w q ü (EMS, electomagnetic susceptability)¾ t ³ sw k mwš.»qƒ ü e w»» w»q vw yw» w x q š t q sw. ù q s» ƒ xy ü z j»ƒ qƒ ü t q w w *Coesponding Autho : [Tel : +82-55-320-3872; E-mail : wwpak@inje.ac.k] 291
292 ½ Á½ Á Á. q sw q w q ƒ z. q,, w q y g q w. s k ù p (CNT, Cabon Nanotube), e (Cabon black), ƒw w q ƒ t w [3-6],, p, p š n w q w [7-9]. w w, w ƒ û n ƒ š, w n ƒ û ƒ. w š CNT, ƒ š [10] w šn Fe 73 Si 16 B 7 Nb 3 Cu s ƒ wš ey ƒw q p e w w w. 2. x x þƒ š Fe 73 Si 16 B 7 Nb 3 Cu 1 w, jet mill w q w z» w attition mill w y g. y 270 mesh ƒ» w 54 μm w j» w z 540 C 1 o» û šn ƒ ù w [11-12]. x ù ƒ ƒ ƒ 10 wt%~50 wt% y ball mill w 1 yww. y w yw 40% v ƒw» w 2 yww k z e q» w Ì 1 mm p w. p 100 C» o 1 e z 24 w g. p p Ì ³ w j» w 70 C o (Rolling) p Ì s³ 0.5 mm w. q p n w» w q ü 3 mm/ 7 mm ƒœw z p j ú (netwok analyze), (AgilentCo. N5230A) 2-pot coaxial w d w š, q p p ƒ ƒƒ 5 cm ƒx p j p (mico-stip line) w 10 MHz~10 GHz q S 11 S 21 d w z w sƒw. 3. x š 1 2 ù ƒw w q p q (ε =ε -jε ) p ùkü. 1 ùk ü 100 MHz ƒ ƒ ƒw ƒw ù 100 MHz ƒ w. w w w ùkü x y ƒ š» [13], 2 x w 1 GHz ¾ ƒ Fig. 1. The eal pat of complex pemittivity cuves plotted against fequency fo the Fe-based EM wave absoption sheets mixed with 10~50 wt% chacoal powde in the 10 MHz~10 GHz ange.
ù Fe 73 yw w x q p 293 Fig. 2. The imaginay pat of complex pemittivity cuves plotted against fequency fo the Fe-based EM wave absoption sheets mixed with 10~50 wt% chacoal powde in the 10 MHz~10 GHz ange. ƒw ù š q w x w. 100 MHz ƒ w ùk ü s x [14-15]w, ƒw. w 1 GHz š q q ƒ w j w š p š q w w p [6, 16] ùküš» ƒ. q ü ƒ ƒw pü w w ƒw q w q»»ƒ f q. 3, 4 q n (μ =μ - jμ ) ùkü, Fe ù ƒ ƒ ƒw x n w. Fe ù ƒw pü v wš n ùkü q p n w. w ƒ x n j yw ùkû. x n q ƒ w p Fig. 3. The eal pat (μ ') (a) of complex pemittivity cuves plotted against fequency fo the Fe-based EM wave absoption sheets mixed with 10~50 wt% chacoal powde in the 10 MHz~10 GHz ange. Fig. 4. The imaginay pat of complex pemittivity cuves plotted against fequency fo the Fe-based EM wave absoption sheets mixed with 10~50 wt% chacoal powde in the 10 MHz~10 GHz ange. ùkü ƒ ƒw p» w ùkü. ƒ ƒ x n j yw q. q sƒ Netwok Analyze j p S-paamete d w 5, 6 ùkü. 5 Fe ƒ ƒw ƒ ƒw ùkþ, ƒ ƒw q
294 ½ Á½ Á Á Fig. 5. S 11 of electomagnetic wave absoption sheets mixed with 10~50 wt% chacoal powde in the 10 MHz~10 GHz ange. Fig. 6. S 21 of electomagnetic wave absoption sheets mixed with 10~50 wt% chacoal powde in the 10 MHz~10 GHz ange. p» ƒ ƒw š p t ƒ j w tv¾ (Skin depth)ƒ ƒ w. w w w ƒw t w ƒw ü ƒ q w» w [16]. 6 ƒ ƒw 1 GHz š q p ùkû. ƒ w p q w š q j w ƒ w Fe ù Fig. 7. Powe loss cuve fo the Fe-based nanocystalline soft magnetic powde sheets mixed with 10~50 wt% chacoal powde in the 10 MHz~10 GHz ange. v n w ùkù. q S-paamete mw w, 7 ùkü. 1 GHz w q ƒ w ƒw ù, 1 GHz š q w ƒ ƒw p. x ww, 100 MHz w q n ƒ w ù j s ƒw 1 GHz w q ƒw q. w, 100 MHz q ƒz ƒ ù j ùkû. 1 GHz š q q w j w w q w. 4. Fe 73 ù ƒ 10~50 wt% ƒw xw q x.
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