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Crystal Structure and Low Temperature Magnetic Properties of Melt - Spun Sm₂Co7B₃ Compound
양충진(C.J.Yang),최승덕(W.Y.Lee),이우영(S.D.Choi) 한국자기학회 1993 韓國磁氣學會誌 Vol.3 No.4
Low temperature magnetic properties and crystal structures of melt-spun Sm₂Co_7B₃ compound were characterized. The magnetic measurements in the temperature range 77 K~450 K indicated that a spin-reorientation took place at about 150~160 K. A large anisotropy was observed(Ha = 135 kOe at 300 K, 725 kOe at 77 K) for Sm2Co7B3 although the magnetic moment is rather low. The crystal structure of the Sm₂Co_7B₃ compound was analyzed in detail by Rietveld analysis of powder diffraction pattern, and it was revealed that B(4h) atoms are not placed in the Sm(2e) layer but in between the Sm(2e) and Co(6i₁) layers.
급속응고중 외부자장에 의한 Nd-Fe-Co(-Zr)-B계 합금의 자기이방성 향상
이우영(C. J. Yang),최승덕(S. D. Choi),양충진(W. Y. Lee) 한국자기학회 1992 韓國磁氣學會誌 Vol.2 No.3
Melt-spun Nd₁₄Fe_(76)Co₄B_6 and Nd_(10.5)Fe_(79)Co₂Zr_(1.5)B_7 ribbons were prepared under an externally applied magnetic field. Magnetic properties in terms of anisotropy were evaluated by discussing the effect of textured structure of the ribbon samples as well as its powders. About 32 % increase in (BㆍH)max and 18.8 % increase in Br were observed along the perpendicular direction of the ribbon plane which is more prominent for the Nd-Fe-Co-Zr-B than for the Nd-Fe-Co-B alloy. The enhancement of magnetic anisotropy was monitored by measuring the anisotropy constant of each alloy as a function of quenching rate of the ribbon. It was found that for the melt-spun ribbbon quenched at slow rate(less than 7 ㎧) the magnetic field effect was overwhelmed by the heat gradient effect through the ribbon thickness while the field effect was prominent at intermediate quenching rate (more than 7~11 ㎧). The reproducible maximum energy product, (BㆍH)max=16.4 MGOe can be obtained from the Nd-Fe-Co-Zr-B alloy.