The thermally assisted reversal of micro-magnetization was simulated for sub-100-nm dots with perpendicular magnetization by using a Langevin-Landau-Lifshitz-Gilbert equation, where thermal effects are modeled by random fields. Two different thermally assisted reversal methods of 1) a thermal relaxation scheme and 2) a switching scheme were compared. Superior performance was obtained for the thermal relaxation scheme from the view point of reducing the reversal field. An auto correlation function in the time domain was introduced to analyze the stochastic properties of the thermally fluctuating directions of magnetization.
In this article we report a perpendicular spin valve behavior in a microstructured noncoupling magnetic trilayer system of Co/Cu-Cu oxide/Co. The Co thin films having markedly different coercivity Hc were prepared with a vacuum evaporation with electron beam (Hc= 20–30 Oe) and rf sputtering (Hc= 90–260 Oe), which enables the selective switching of the magnetization in the base and counter Co layers. The film surface of the Cu was oxidized by the rf sputter etching, which results in the increase of the resistance for the perpendicular current and enables measurements of the perpendicular spin valve behavior at room temperature. The additional spacer layer of sputtered SiO2 with a contact hole of 5 μm diameter was fabricated with photolithographic method between the bottom Co and the intermediate Cu layer, which defined the current path perpendicular to the film plane. The measured magnetoresistance ratio was 0.85% (dR=7.6 mΩ, R=0.89 Ω) at room temperature.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.