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유권상(K. S. Ryu),김철기(C. G. Kim),김중복(J. B. Kim),김현아(H. A. Kim) 한국자기학회 1996 韓國磁氣學會誌 Vol.6 No.1
We have constructed a displacement sensor for measuring dynamic magnetostriction of an amorphous ribbon under alternating magnetic field using fiber optic Fabry-Perot interferometer. The signal of the sensor was dependent on the index matching oil and the optical isolator. The resolution of the sensor was 30 Å and the measured peak to peak magnetostriction of the amorphous ribbon Fe_(81)B_(13.5)Si_(3.5)C₂ was 28×10^(-6).
Rabi 핵자기 공명법을 이용한 다전류 솔레노이드의 자장균일도 향상
김철기(C.G. Kim),유권상(K.S. Ryu),우병칠(B.C. Woo),김창석(C.S. Kim) 한국자기학회 1992 韓國磁氣學會誌 Vol.2 No.3
The multicurrent method composed of a main and auxiliary currents was used to make the uniform field near the solenoid center. The auxiliary currents were determined to give the spherical symmetry in the field uniformity from the Legendre polynomials. Rabi's NMR system using polarized flowing water has been constructed and the field of a 4-current solenoid has been determined from the resonance frequency. The field uniformity along the solenoid axis has been improved by adjusting the auxiliary currents.
이광은(K. E. Lee),느반더(L. V. Tho),김상훈(S. H. Kim),김철기(C. G. Kim),김종오(C. O. Kim) 한국자기학회 2006 韓國磁氣學會誌 Vol.16 No.4
Amorphous alloys of Co-rich magnetic amorphous films are well known as typical soft magnetic alloys. They are used for many kinds of electric and electronic parts such as magnetic recording heads, transformers and inductors. CoFeHfO thin films were prepared by RF magnetron reactive sputtering. The films were deposited onto Si(100) substrates with a power of 300W at room temperature. The reactive gas was introduced up to 10% (O₂/(Ar + O₂)) during deposition, and the Co<SUB>39</SUB>Fe<SUB>34</SUB>Hf<SUB>9.5</SUB>O<SUB>17.5</SUB> thin film exhibit excellent soft magnetic properties : saturation magnetization (4πM<SUB>s</SUB>) of 19 kG, magnetic coercivity (H<SUB>c</SUB>) of 0.37 Oe, anisotropy field (H<SUB>k</SUB>) of 48.62 Oe, and an electrical property is also shown to be as high as 300 μΩcm. It is assumed that the good soft magnetic properties of Co<SUB>39</SUB>Fe<SUB>34</SUB>Hf<SUB>9.5</SUB>O<SUB>17.5</SUB> thin film results from high electrical resistivity and large anisotropy field.