Intrinsic coercivities of molecular beam epitaxy grown single-crystal Ni films on Ag buffer layer |
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Authors: | SU Jen TC Wu CC Yu |
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Institution: | Institute of Physics, Academia Sinica, Nankang, Taipei 11529, Taiwan, ROC |
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Abstract: | Single-crystal Ni films were made by the molecular beam epitaxy (MBE) method on Si(1 0 0) and Si(1 1 0) substrates, respectively, with an 100 Å thick Ag buffer layer. The growth temperature TS was 270 °C, and the film thickness t was 500 Å. From reflection high-energy electron diffraction (RHEED) patterns, the crystalline symmetries of the two films are clear and as expected. Intrinsic coercivities, HC(1 0 0) and HC(1 1 0), are plotted as a function of the angle of rotation ? around the crystal axes 1 0 0] and 1 1 0], respectively. The results show that both HC(1 0 0) and HC(1 1 0) exhibit mixed features of the crystalline (KC) and the induced uniaxial magnetic (Ku) anisotropies. Ku is the magneto-elastic energy, due to lattice mismatch at the Ni/Ag interface. Moreover, the crystalline anisotropy fields, HK(1 0 0) and HK(1 1 0), and the induced anisotropy filed, Hu, can be calculated as a function of ?, respectively. Then, each HC curve is fitted by the equation: HC = Ho + HK + Hu, where Ho is the isotropic pinning field. Meanwhile, domain structures were examined by the Bitter method, using Ferrofluid 707. On the Ni(1 0 0) film, we observed the charged cross-tie walls, and on the Ni(1 1 0) film, the un-charged Bloch walls. |
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Keywords: | 75 60 &minus d 75 30 Gw 75 30 Pd 75 70 Ch |
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