Effect Of Buffer And Spacer Layer Thicknesses On Magnetic Properties Of Co/Si/Co/GaAs Multilayer

Hysteresis loop changed from two phase to single phase with decreasing Si‐spacer layer thickness in Co/Si/Co/GaAs. Addition of Au buffer layer changed the phase of hysteresis loop. Coercivity of 50 nm Co layer on Si decreased with increasing Si‐spacer layer thickness. We propose that formation of cobalt silicides at the interface of Co and Si modulated magnetic properties of the multilayer without buffer layer. The multilayer (dSi⩾25 nm) showed two phase hysteresis loop without buffer layer at low temperature.