Berlin 2012 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 46: MagneticThin Films II
MA 46.3: Vortrag
Donnerstag, 29. März 2012, 15:30–15:45, EB 202
Stretchable Magnetoelectronics — •Michael Melzer1, Daniil Karnaushenko1,2, Gungun Lin1,2, Denys Makarov1, Ingolf J. Mönch1, and Oliver G. Schmidt1,2 — 1Institut für Integrative Nanowissenschaften, IFW Dresden, Helmholtzstraße 20, 01169 Dresden — 2Materialsysteme der Nanoelektronik, Technische Universität Chemnitz, Reichenhainer Straße 70, 90107 Chemnitz
Currently, magnetic sensors are fabricated on rigid substrates like silicon wafers. However, successful operation of such devices on stretchable and flexible substrates can open up a variety of new applications due to arbitrary surface geometries possible after fabrication. Here, we exploit the surface wrinkling effect of thin metal layers on PDMS rubber membranes to create stretchable magnetoresistive (GMR) sensors [1]. The investigated systems include GMR multilayers as well as top pinned spin valves. Magneto-electric measurements reveal similar characteristics for such sensor elements on free-standing rubber membranes as on conventional silicon wafers, despite the different surface structures. The thermally induced wrinkling of the GMR layer along with the free-standing rubber membrane underneath allows for a totally elastic stretchability of the sensor element preventing the GMR film from cracking. In this respect the world’s first elastically stretchable magnetic sensors are introduced and a new strategy for biosensors with intriguing advantages is outlined as an example for their application. The work was supported in part by the German federal ministry of education and research (project Nanett; FKZ: 03IS2011).
[1] M. Melzer et al., Nano Letters, 11, 2522 (2011).