High magnetoresistance of InSb with an embedded Au core

This study explores the possible scalability of the device by investigating the magnetoresistance (MR) of small sized devices around 100 mum in diameter. Polycrystalline InSb film (1 mum thick) is thermally evaporated onto the insulating Si substrate. InSb van der Pauw disk (100 mum size) was fabricated by standard microfabrication techniques. Subsequently, the core and contact pads are covered by a Ti/Au, with Au being the dominant component. The MR of prepared devices with different embedded Au size is systematically investigated to find out the optimum embedded Au size and the origin of geometrical MR.