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2 Electron Technology

2 1998

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Structural and magnetic properties of the Co-sputtered Fe-ceramic thin film

100%

Yu S. C. , Kim W. T. , Han S. H. , Kim H. J.

tom Vol. 31, No. 1

102-107

The structure and magnetic properties of Fe-ceramics (Si₃N₄, Al₂O₃) thin films fabricated gy an rf magnetron co-sputtering technique were studied by X-ray diffractometry, magnetometry and electrical resustivity measurement. The concentration of Fe in the film decreases linearly with the area fraction of ceramic pieces on the target. As the area fraction of the ceramic pieses increases, the phase of thin film changes from bcc crystaline phase to amorphous phase, and the magnetization of the film decreased due to the decrease of Fe content and also due to the decreased of grain size. The electrical resistivity of thin films increases significantly with decreasing Fe content. Saturation magnetization of co-sputtered thin films could be explained by a mixture of two types of particles showing paramagnetism and ferromagnetism.

The effects of sintering additives on sinterability and microwave properities of yttrium iron garnet

88%

Kim W. T. , Song Y. Y. , Yu S. C. , Park J. R. , Lee S. S.

tom Vol. 31, No. 1

121-128

The effects of small addition of either Bi₂O₃ or a mixture of CuO + B₂O₃ on sinterability and microwave properties of yttrium iron garnet (YIG), prepared using a conventional ceramic method, have been studied by means of scanning electron microscopy, X-ray diffractometry, magnetometry and ferromagnetic resonance experiments. Sintering temperature for YIG could be reduced by about 50 K or 150 K by adding small amount of Bi₂O₃ or a mixture of B₂O₃ + CuO. Saturation magnetization and Curie temperature of YIG samples were almost independent of the addition of sintering additives. YIG specimens sintered at 1623 K with 1.5 wt% Bi₂O₃ and YIG sintered at 1523 K with 1.0 wt% of B₂O₃ + CuO mixture showed ferromagnetic resonance linewidth DH of 62 Oe and 58 Oe, respectively, compared with 65 Oe in pure YIG specimen sinterded at 1673 K for 2 hrs.