Contactless magnetic nanoparticle detection platform based on non-linear GMI effect

A detection platform based on non-linear Giant Magnetoimpedance Effect was analyzed for the design of a contactless and low-cost detector magnetic nanoparticles. The sensor consists two soft amorphous wires (Co66Fe2Si13B15Cr4, 1.5 cm in length) placed parallel connected electrically series. Initially, simple voltage divider employed to characterize variations first, V1fand second harmonic, V2f, voltages. Their response under effect remnant field generated by different amounts Fe3O4 nanoparticles (mean diameter 140 nm) as function an external field, H. Due larger relative showed harmonic chosen final prototype development. An electronic interface designed both current excitation V2f detection. platform, characterized high sensitivity, low-cost, portable, reusable features, can be efficiently detect