Giant Magnetoresistance and Microstructure Modulated by Spinodal Decomposition in Co-Cu and Co-Ni-Cu Ribbons
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概要
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The relation between the giant magnetoresistance (GMR) and the microstructure modulated by the spinodal decomposition has been investigated for aged Co-Cu and Co-Ni-Cu liquid quenched ribbons. Solid solutions were obtained in the concentration range x<15 in Co_xCu_<100-x> as-quenched ribbons and the solubility limit was extended by the replacement of Cu by Ni in Co_<15>Ni_xCu_<85-x> as-quenched ribbons. The microstructure associated with the spinodal decomposition produced by isothermal aging for Co_<10>Cu_<90>, Co_<15>Cu_<85> and Co_<15>Ni_xCu_<85-x> ribbons is closely correlated with the giant magnetoreistance. In the phase decomposition, the MR ratio due to the spin dependent scattering increases with the increase in the interface area in the constant wavelength region. A maximum MR ratio of 8.1 % in 15 kOe was obtained in the Co_<10>Cu_<90> ribbon aged at 673 K for 166 h. By longer aging, the MR ratio decreases with the increase of the wavelength, while the field dependence of the MR ratio becomes larger in low fields due to the coarsening of magnetic particles. Lower isothermal aging temperature for the Co_<10>Cu_<90> ribbon and the replacement of Co by Ni for Co_<15>Ni_xCu_<85-x> ribbons lead to the shorter wavelength, namely the shorter periodic compositional fluctuation. A resulting maximum MR ratio of the Co_<15>Ni_5Cu_<80> ribbon aged at 723 K for 4 h is 8.2 %. Further, the field dependence of the MR ratio in low fields becomes larger with the Ni content and the largest mean MR ratio between 0 and 300 Oe, 2.6%/ΔH, was obtained in the Co_<15>Ni_<10>Cu_<75> aged ribbon. This behavior would be correlated with the decrease of the magnetocrystalline anisotropy in the magnetic particles and with the shorter wavelength in the modulated microstructures.isothermal agingsupersaturationGibbs free energygiant magnetoresistancespinodal decompositioninterface areawavelengthmicrostructuresuperparamagneticTEM
- 東北大学の論文
- 1997-03-25
著者
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Fukamichi Kazuaki
Department Of Aterials Science Graduate School Of Engineering Tohoku University
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Kim Ick
Department Of Materials Science Faculty Of Engineering Tohoku University:(present Address)high-perfo
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- PREFACE
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