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(Nd₁-xRx)₂Fe₁₄B (R=Y, Pr)의 자기특성
김만중(M. J. Kim),김윤배(Y. B Kim),김희태(H. T. Kim),김택기(T. K. Kim) 한국자기학회 1998 韓國磁氣學會誌 Vol.8 No.5
Spin reorientation and magnetocrystalline anisotropy of magnetically aligned (Nd_(1-x)Rx)₂Fe₁₄B (R=Y, Pr) power were studied. The spin reorientation temperature (T_(SR)) of (Nd_(1-x)Pr_x)₂Fe₁₄B decreases linearly by increasing Pr-substitution with the ratio of △T_(SR)=-1.35 K/Pr at.% in composition range of 0≤x≤0.75. The spin reorientation temperature of (Nd_(1-x)Yx)₂Fe₁₄B decreases by increasing Pr-substitution to 118 K (x = 0.5) then increases to 122 K (x = 0.75). The spin reorientation angle at 4.2 K decreases by increasing rare earth substitution with the ratio of △SRA = -0.073°/Y at.% and △SRA = -0.258°/Pr at.% in composition range of 0≤x≤0.5. The spin reorientation is expected to disappear at x≥0.9 in case of (Nd_(1-x)Yx)₂Fe₁₄B and at x≥0.8 in case of (Nd_(1-x)Pr_x)₂Fe₁₄B.
김만중(M. J. Kim),유권상(K. S. Ryu),양재호(J. H. Yang),김윤배(Y. B. Kim),김택기(T. K. Kim) 한국자기학회 2000 韓國磁氣學會誌 Vol.10 No.6
[(300 ㎚)Ta/(500 ㎚)NdFeB/(300 ㎚)Ta] thin films were deposited at 5 mTorr Ar gas pressure by RF-DC magnetron sputtering. and their magnetic properties were investigated. The [Ta/NdFeB/Ta] films deposited on heated Si substrates showed high perpendicular anisotropy and excellent hard magnetic properties. The films sputtered at the substrate temperature of Ts= 650℃ and 700℃ showed (BH)max= 20 MGOe and iHc= 18.9 kOe along the perpendicular direction to the film plane, respectively.
일축이방성 다결정의 자화곡선을 이용한 포화자화 및 결정자기이방성상수 결정에서의 오차분석
김만중(M. J. Kim),허진(J. Hur),김윤배(Y. B. Kim),김택기(T. K. Kim) 한국자기학회 1999 韓國磁氣學會誌 Vol.9 No.4
Errors of saturation magnetization and magnetocrystalline anisotropy constant determined by magnetization curve of magnetically aligned uniaxial power were analyzed. In case of alignment factor (θ0)=10°, magnetic constant errors of Nd₂Fe₁₄B were calculated to be error of Ms ≒ 1 % and error of K₁ ≒ 13 %, respectively, and magnetic constant errors of Ba-ferrite were calculated to be error of Ms ≒ 1 % and error of K₁ ≒ 17 %. In this method, Ms was found to be determined with high accuracy. High alignment is desirable for high accuracy.