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• W2898821911 abstract "The epitaxially grown L1 <sub xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>0</sub> Mn <sub xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>53-x</sub> Ga <sub xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>47</sub> Al <sub xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>x</sub> (x = 0-6) thin films of island structure were fabricated onto MgO (100) substrates held at about 600 °C during deposition. Those islands possess the (001) axis perpendicular to the substrate surface; the order parameters S of which are found to be 0.9, 0.7, and 0.4 for x = 0, 3, and 6, respectively. It is emphasized that the highly ordered LL1 <sub xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>0</sub> phase (S = 0.7) is fabricated with even Mn 50 at%, much less than 55 at%, which is the boundary for LL1 <sub xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>0</sub> phase in the bulk phase diagram. The saturation magnetization Ms is about 380, 480, and 90 emu/cm <sup xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>3</sup> at 5 K for x = 0, 3, and 6, respectively. In order to estimate the Curie temperature T <sub xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>c</sub> , the temperature dependence of M <sub xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>s</sub> was fit to an empirical relation of M <sub xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>s</sub> (T)/M <sub xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>s</sub> (0) = (1- T/T <sub xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>c</sub> ) <sup xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>α</sup> , where α is a fitting parameter. It is found that T <sub xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>c</sub> is about 600 K for both x = 0 and 3, and 550 K for x = 6, respectively. The values of the uniaxial magnetic anisotropy constant K <sub xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>u</sub> are 1.1 x 10 <sup xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>7</sup> , 6 x 10 <sup xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>6</sup> , and 2 x 10 <sup xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>5</sup> erg/cm <sup xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>3</sup> at 5 K for x = 0, 3, and 6, respectively. The power law exponent n for the correlation between K <sub xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>u</sub> (T) and M <sub xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>s</sub> (T) for a temperature range from 5 to 400 K is found to be about 2.6 and 2.2 for x = 0 and 3, respectively. Therefore, one cannot conclusively assign which mechanism (the single-ion or two-ion mechanism) plays a role in the magnetic anisotropy mechanism. However, the overall correlation strongly suggests a deviation from the single-ion mechanism, consistent with theoretical predictions of the non-negligible site decomposed magnetic anisotropy of Ga in the magnetic anisotropy mechanism." @default.
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• W2898821911 date "2018-11-01" @default.
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• W2898821911 title "Magnetic and Structural Properties of L10 Mn–Ga–Al Epitaxially Grown Thin Films of Island Structure" @default.
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