Regensburg 2016 – scientific programme

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MA: Fachverband Magnetismus

MA 39: Magnetic Particles

MA 39.4: Talk

Thursday, March 10, 2016, 10:15–10:30, H31

GMR sensors for detection of magnetic nanoparticles in lubricants — •Thomas Rempel, Martin Gottschalk, and Andreas Hütten — Center for Spinelectronic Materials and Devices, Physics Department, Bielefeld University, PB 100131, D-33501 Bielefeld, Germany

Magnetic nanoparticles are growing of technological interest and show beneficial characteristics in a wide field of applications. One emerging field of application is the use of magnetic nanoparticles in lubricants to e.g. tune the lubricant's friction coefficient. As particle concentration and agglomeration influence the lubricants properties, an on-site quality control device is necessary for real life application. We demonstrate our first approach based on a GMR sensor to face these challenges. Therefore, serpentine shaped sensors are fabricated by lithographic methods on which solvents with magnetic nanoparticles are placed. The sensor's response will be discussed for different geometries. To characterize the particle dispersion and agglomeration inside the lubricant, microscopic techniques with resolutions on the nanometer length scale are necessary. We present an approach to get an insight of the nanoparticle distribution and agglomeration with a dual beam focused ion beam (FIB) and a scanning electron microscope.