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Effects of buffer layer temperature on the magnetic properties of NdFeB thin film magnets
Kim, Y.B.,Cho, S.H.,Kim, H.T.,Ryu, K.S.,Lee, S.H.,Lee, K.H.,Kapustin, G.A. Elsevier 2004 Journal of magnetism and magnetic materials Vol.272 No.suppl
<P><B>Abstract</B></P> <P>Effects of the buffer layer temperature (<I>T</I> <SUB>b</SUB>) on the magnetic properties and microstructure of [Mo/NdFeB/Mo]-type thin films have been investigated. The Mo-buffer layer with low <I>T</I> <SUB>b</SUB> is composed of fine grains while that with high <I>T</I> <SUB>b</SUB> has coarse grains. The subsequent NdFeB layer also grows with fine or coarse grains following the buffer layer structure. The NdFeB layer grown on a low <I>T</I> <SUB>b</SUB> buffer shows high coercivity and strong perpendicular anisotropy. The best magnetic properties of <SUB>i</SUB> <I>H</I> <SUB>c</SUB>=1.01MA/m (12.7kOe), <I>B</I> <SUB>r</SUB>=1.31T (13.1kG) and <I>BH</I> <SUB>max</SUB>=329kJ/m<SUP>3</SUP> (41.4MGOe) were obtained from the film with <I>T</I> <SUB>b</SUB>=400°C.</P>
희토류 영구자석의 자성측정을 위한 고감도 펄스마그네토미터
김윤배(Y. B. Kim),G. A. Kapustin(G. A. Kapustin) 한국자기학회 2005 韓國磁氣學會誌 Vol.15 No.4
A 8MA/m-class pulsed field magnetometer has been constructed by composing a pulsed field magnet, a pickup coil, analog integrators, a digital storage oscilloscope and a personal computer. For precision measurements, a 3-axis compensation principle has been applied for the fabrication of pickup coil, and the compensation level of the order of 10^(-6) and the sensitivity of 5ㆍ10^(-7) Am² for magnetic moment have been obtained. The high sensitivity of the magnetometer is good enough for measurements of magnetic properties of rare earth magnets in small size or thin films shorter than 3 ㎜φ in diameter.