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2 Electron Technology

2 1998

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

100%

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.

Angular dependencies of longitudinal magnetoresistivity and planar hall effect of single and multilayered thin films

72%

Ko T. W. , Lee J. H. , Park B. K. , Jang P. W. , Hwang D. G. , Lee S. S. , Kim M. Z. , Rhee J. R.

tom Vol. 31, No. 1

70-79

Magnetoresistivity and planar Hall effect of a Glass/Fe₇₀Å/(Co₂₁Å/Cu₂₅Å)₂₀ multilayer coupled antiferromagnetically a single layer (Co₈₁Nb₁₉) thin film, and NiO based Glass/NiO₃₅Å/Py₅₀Å/Cu₂₀Å/Py₅₀Å spin valve spin valve are studied. Planar Hall resistivity is analyzed concurrently with the resistivity of each sample. With variation of direction and strength of the applied fields, we found thwt the magnetization process affects significantly the planar Hall effect. We devwloped a simple method to find the easy axis of single layer magnetic thin films. We also observed the variation of magnetization of each layer separately for an antiferromagnetically coupled multilayer, and a NiO-based spin valve with the planar Hall effect.