鏡面反射によるGMR効果の増大

概要

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Spin-valve sandwiches showing giant magnetoresistance are promising materials for future high-density recording heads. Very thin spin-valves having film thicknesses less than 20 nm are required for MR heads with extremely narrow shield gaps for recording at ultra-high densities such as 20-40 Gb/inch^2. In this case, the film thickness of the spin-valves becomes smaller than the electron mean free path, and deterioration of the MR ratios occurs on account of diffusive scattering at the film surfaces. The authors have studied the specular scattering effect of the conduction electrons with the aim of enhancing the GMR. This paper reports enhancement of GMR through the use of specular reflective metallic layers and oxide pinning layers. The relation between the MR ratios and the specular reflectivity is also discussed, and the experimental data are compared with the numerical results by using Barnas's model.
社団法人日本磁気学会の論文
1998-08-01