giant magnetoresistance (CPP-GMR) of the multilayer thin film using a full-Heusler (CMS) phase as ferromagnetic electrodes has been investigated. A multilayer of Cr buffer spacer cap was grown on a MgO(100) substrate. The thick CMS layer which was deposited on the Cr buffer at was epitaxially grown and had an structure. The resistance change-area product at room temperature was , which is one order of magnitude larger than those in previously reported trilayer systems, resulting in the MR ratio of 2.4%. A possible origin of the enhanced is considered to be the large spin polarization in a high-quality CMS film.
The authors thank Y. Murakami, M. Ishiguro, and T. Ashino for the film composition analysis. The sample preparation was performed at Advanced Research Center of Metallic Glasses, IMR, Tohoku University. This work was in part supported by the Ministry of Education, Science, Sports and Culture, Grant-in-Aid for Scientific Research (B), 17360346, 2005.
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