Abstract:
We have studied the local order around cobalt atoms in Pt/Co/Pt layered systems gradually modified by irradiation using 30 keV helium ions. Using X-ray diffraction and X-ray Absorption Fine Structure, we have determined the crystallographic order, the number of Co-Co and Co-Pt bonds and the corresponding bond lengths both in-plane and in the perpendicular direction. The comparison with an interdiffusion model highlights the unexpected complexity of the initial Pt/Co/Pt nanostructure. We use the Néel/Bruno model of magnetic anisotropy to correlate the structure and the magnetic hysteresis properties. We then identify the structural consequences of irradiation onto the short range order. The irradiation induces a substitutional mixing maintaining the initial crystallographic structure. We confirm that the mixing rate is in agreement with a ballistic mechanism of mixing. In addition, we show that the previously reported irradiation-induced controlled decrease of the magnetic anisotropy can not be solely attributed to Co-Pt intermixing: irradiation also significantly releases the 3.4% tensile strain of the cobalt-rich dense planes. We finally speculate on the class of magnetic materials the concept of light ion irradiation could be extended to.
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Received 10 April 2001
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Devolder, T., Pizzini, S., Vogel, J. et al. X-ray absorption analysis of sputter-grown Co/Pt stackings before and after helium irradiation. Eur. Phys. J. B 22, 193–201 (2001). https://doi.org/10.1007/s100510170127
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DOI: https://doi.org/10.1007/s100510170127