# Study of magnetization reversal in ultra-thin magnetic cobalt(x)((chromium(17)tantalum(5))(1-x)/platinum multilayer using in situ MOKE

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 Title: Study of magnetization reversal in ultra-thin magnetic cobalt(x)((chromium(17)tantalum(5))(1-x)/platinum multilayer using in situ MOKE Li, Ning Lairson, Bruce M. Master of Science thesis The magnetization reversal mechanism in Co/Pt and CoCrTa/Pt thin-film multilayers was investigated in situ using a Magneto-Optical Kerr Effect (MOKE) apparatus. Multilayers Nx(Co/Pt) and Nx(CoCrTa/Pt) with different amounts of doped $\rm Cr\sb{17}Ta\sb5$ were sputtered in high vacuum. The growth was interrupted at intervals of two bilayers to perform perpendicular MOKE loops in the range from N = 2 to N = 20. The Draaisma and De Jonge model was adapted to analyze the hysteresis loops with the domain wall energy density as a fitting parameter. The broad consistency of the experimental data with theory shows that the incorporation of Cr and Ta in the magnetic layer lowers the domain wall energy density. The model successfully predicts the thickness dependence of the loop squareness, which decreases with increasing N. According to the model, the domain repetition length d is in the range 750A to 2100A, and the domain wall energy density $\rm\sigma\sb{w}$ is in the range of 1.68 $\rm erg/cm\sp2$ to 11.12 $\rm erg/cm\sp2.$ Li, Ning. (1997) "Study of magnetization reversal in ultra-thin magnetic cobalt(x)((chromium(17)tantalum(5))(1-x)/platinum multilayer using in situ MOKE." Masters Thesis, Rice University. http://hdl.handle.net/1911/17105. http://hdl.handle.net/1911/17105 1997