Inverse Magnetoresistance Loops in Nearly Percolating Co–Ag Nanostructures and Two-Phase Model
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概要
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We observed unusual inverse magnetoresistance (MR) loops in the transverse configuration for nearly percolating Co–Ag granular thin films deposited by a coevaporation technique onto a room-temperature glass substrate. When the substrate was heated above about 60°C during evaporation, the inverse MR loops disappeared and converted into normal loops. On the other hand, when the sample was annealed below about 120°C after deposition onto a room-temperature substrate, the inverse MR loops remained, whereas when annealed from about 120 to 300°C, the inverse MR loops were converted into "$\text{normal}+\text{inverse}$"-type loops and finally into totally normal loops when annealed above about 350°C. The unusual MR loops may have originated from magnetic nanostructures in nearly percolating Co–Ag granular films. A two-phase model incorporating uniaxial anisotropy, exchange interaction and spin-dependent scattering is presented, which is able to qualitatively explain some of the observed results.
- Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physicsの論文
- 2005-09-15
著者
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Saito Toshiaki
Department Of Medicinal Chemistry Showa Pharmaceutical University
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Nakanishi Hideo
Department Of Ophthalmology And Visual Sciences Kyoto University Graduate School Of Medicine
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Ugajin Tamotsu
Department of Physics, Faculty of Science, Toho University, Funabashi, Chiba 274-8510, Japan
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Sonobe Akemi
Department of Physics, Faculty of Science, Toho University, Funabashi, Chiba 274-8510, Japan
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Shimaoka Yuhji
Department of Physics, Faculty of Science, Toho University, Funabashi, Chiba 274-8510, Japan
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Saito Toshiaki
Department of Physics, Faculty of Science, Toho University, Funabashi, Chiba 274-8510, Japan
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Saito Toshiaki
Department of Civil Engineering, College of Science and Technology, Nihon University
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