Abstract
The ideal magnetic switching mechanism for many types of data storage, including hard disk recording, is isolated domain coherent rotation. However, in typical Pd/Co multilayers with high coercivity, the dominant switching mechanism is domain wall motion, which causes noise in the readback signal. We have investigated the addition of elements, such as carbon, into Pd/Co multilayers to reduce the coupling between adjacent magnetic domains. This reduction of magnetic coupling reduces the length scale over which incoherent switching occurs. Kelly–Hankel plots and the switching radius ratio have been used to compare interactions and domain sizes of oxidized and carbon segregated Pd/Co multilayers. Both oxidation and carbon segregation reduce the coupling between domains, but the multilayers nevertheless remain more strongly coupled than perpendicular alloy films.
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