Abstract
We present a study of the structure and the corresponding magnetic property of Co <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">5</sub> Ni <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">95</sub> /Cu(001) ultrathin films during exposure to oxygen. For a film below the critical thickness (t <i xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">c</i> ) of spin reorientation transition (SRT) from in-plane to a perpendicular direction, the SRT occurs while introducing oxygen for 25 Langmuir (L), followed by decreasing the perpendicular magnetization for further oxygen exposure. For a film above t <i xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">c</i> , the perpendicular magnetization is enhanced while introducing oxygen for 25 L and decreases during additional oxygen exposure. In both these cases, the interlayer distance ( <i xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">d</i> ) varies only 1.1% during the SRT or the enhancement of the perpendicular magnetization, whereas the <i xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">d</i> increases substantially when perpendicular magnetization disappears. This implies that the oxygen-induced SRT of the CoNi/Cu(001) alloy films is not materially affected by the <i xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">d</i> of the surface layer. This might indicate the formation of antiferromagnetic oxide that induces the SRT of CoNi/Cu(001) alloy films.
Published Version
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