Abstract
We demonstrate that chemisorption of a dodecanethiol (C12H25SH) self-assembled monolayer on the surface of a Au film alters the coercivity Hc of an underlying Co film, as measured using the planar Hall effect. Changes in Hc occur over a time scale of hours, and only when the thiolated devices are biased with perpendicular magnetic fields. While vacuum-stored samples show larger changes in Hc than those stored under ambient conditions, sample-sample variability persists. We hypothesize that the coercivity shifts are caused by magnetostatic fields originating at the Au-thiol interface, which affect the Co domain structure during magnetization reversal.
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