Abstract
A magnetic biosensor using an anisotropicmagnetoresistance effect based on a wave-like pseudo-spin valve is proposed. The wave-like structure formed trenches for attaching cells, which contain Fe 3 O 4 magnetic nanoparticles by endocytosis, and subsequently altered the magnetic properties of pseudo-spin valve (10 nm Ti/8 nm CoFe/[4 nm Cu/4 nm CoFe]4/[4 nm Cu/8 nm CoFe]4/10 nm Ti).We measured themagnetic hysteresis loops via vibrating samplemagnetometer (VSM) in three orthogonal directions. It was observed that devices with attaching cells show significant increases of the switching fields compared to the case without attaching cells when the external magnetic field is in parallel to the elongated trenches, considering an easy axis. © 2013 IEEE.