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NdxFe77B₂₃-x(4<x<13) 급속응고 합금의 자기특성
박우식(W. S. PARK),김윤배(Y. B. KIM),김희태(H. T. KIM),조용수(Y. S. CHO),김창석(C. S. KIM),박만장(M. J. PARK) 한국자기학회 1995 韓國磁氣學會誌 Vol.5 No.1
Nd_xFe_(77)B_(23-x)(x = 4, 6, 8, 11, 13) alloys were prepared by rapid quenching technique. They were crystallized at higher than 650℃ and subsequently the magnetic properties were investigated. The melt-spun alloy of x=8 consisted of nearly single metastable compound Nd₂Fe₂₃B₃ and showed the soft magnetic property. In 8≤x≤13 alloys, the coercivities were increased according to the increase of Nd content but the remanences decreased. In 4≤x≤6 alloys, the coercivities and the remanences were increased by lowering Nd content. In x = 4 alloy, the ratio of soft to hard magnetic phase was 70 : 30 and the energy product was 96 kJ / ㎥ (12MG.Oe).
S, J, K 주파수영역에서 MgFe₂O₄ 단결정의 강자성공명 연구
박만장(M. J. Park),김기현(K. H. Kim),이혜정(H. J. Lee),김영호(Y. H. Kim) 한국자기학회 1996 韓國磁氣學會誌 Vol.6 No.5
We have manufactured FMR spectrometer over wide range(2-35 ㎓). In order to test FMR spectrometer, resonance absorption has been measured of the standard sample DPPH. The Q vaules of absorption line are 189-1096. As a result, We noticed that FMR spectrometer has been manufactured well. FMR studies of MgFe₂O₄ single crystal have been performed at S, J, K-band. The resonance lines have been observed for the each orientation of (100) plane at 300 K. The values of the magnetic anisotropy constant K₁ and the spectroscopic splitting g valule have been calculated from the ferromagnetic resonance curve, -2.9×10⁴erg/㎤, 2.02 at 23.89 ㎓, -2.2×10⁴erg/㎤, 1.89 at 5.3 ㎓ and -2.8×10⁴erg/㎤, 2.01 at 3.6 ㎓.