Perpendicular Magnetic Anisotropy in Amorphous Ferromagnetic CoSiB/Pt Multilayers
Magnetic anisotropy properties of amorphous ferromagnetic CoSiB/Pt multilayers with perpendicular magnetic anisotropy (PMA, K u) were systematically investigated as a function of CoSiB layer thickness (t coSiB) and Pt layer thickness (t Pt). In two series of [CoSiB t coSiB/Pt t Pt]5 multilayers, the perpendicular coercivity (H c) increased to reach a maximum and then decreased with further increase in both t coSiB and t Pt, due to intermixing of CoSiB/Pt interfaces. Particularly, using the amorphous soft magnetic CoSiB, the coercivity became very sensitive to the CoSiB thickness. These multilayer films exhibited a high K u of 2 × 106 erg/cc and a high H c of 360 Oe with marked squareness. It was found that even after annealing at 350 °C, the CoSiB/Pt multilayers had a high PMA and their H c increased.
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Document Type: Research Article
Publication date: January 1, 2011
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