Structural Properties of Alternate Monatomic Layered [Fe/Co]n Epitaxial Films on MgO Substrate
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概要
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Body-centered-cubic (bcc) Fe50Co50 material is reported to show a high bulk spin scattering coefficient on current perpendicular to plane–giant magneto-resistance (CPP–GMR) system. But the origin of that phenomenon does not make sure yet. We prepared artificially alternate monatomic layered (AML) [Fe/Co] 41 MLs epitaxial films ($T_{\text{s}}$: 75, 250 °C) by monatomic deposition method and investigated the topology of AML [Fe/Co]n epitaxial films on MgO substrate with different orientation (001), (011) by the scanning tunnel microscopy (STM) and reflection high energy electron diffraction (RHEED), which we could confirm Frank–van der Merwe (FM) growth mode for AML [Fe/Co]n on MgO(001) and Volmer–Weber (VW) growth mode for that on Mg(011). The roughness of surface, $R_{\text{a}}$ (0.20 nm) of AML [Fe/Co] 41 MLs epitaxial film grown at 75 °C on MgO(001) is smaller than that (0.46 nm) of AML [Fe/Co] grown at 250 °C on MgO(001), which has the large terraces of over 50 nm ($R_{\text{a}}$: 0.17 nm), even though there are some valleys between large terraces. Moreover we confirmed the structural properties of trilayered epitaxial films with AML [Fe/Co]n ($R_{\text{a}}$: 0.18 nm) and Fe50Co50 alloy epitaxial film on Au electrode by RHEED before confirming the characteristics of CPP–GMR devices.
- 2008-06-25
著者
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Doi Masaaki
Department Of Crystalline Materials Science Faculty Of Engineering Nagoya University
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Sahashi Masashi
Department Of Electronic Engineering Graduate School Of Engineering Tohoku University
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Doi Masaaki
Department of Electronic Engineering, Tohoku University, Sendai 980-8579, Japan
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Chu In
Department of Electronic Engineering, Tohoku University, Sendai 980-8579, Japan
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Saki Yoshinobu
Department of Electronic Engineering, Tohoku University, Sendai 980-8579, Japan
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Kawasaki Shohei
Department of Electronic Engineering, Tohoku University, Sendai 980-8579, Japan
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