Berlin 2012 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 52: Poster II - Magnetic Heusler compounds, Magnetic shape memory alloys, Thin Films, Micro-/Nano-structured magnetic materials, Graphene, Spins in organics, Magnetic imaging, Surface Magnetism, Spin excitations/Torque, Spincaloric transport
MA 52.34: Poster
Freitag, 30. März 2012, 11:00–14:00, Poster A
Mechanical deformation of Dy nanocontacts in magnetic field — Marc Müller1, •Oliver Berg1, Christoph Sürgers1, and Hilbert v. Löhneysen1,2 — 1Karlsruhe Institute of Technology, Physikalisches Institut and Center for Functional Nanostructures, D-76049 Karlsruhe — 2Karlsruhe Institute of Technology, Institut für Festkörperphysik, D-76021 Karlsruhe
Recently, we demonstrated the reproducible tuning of the electrical conductance of Dy nanocontacts in a magnetic field by exploiting the large magnetostriction of Dy [1]. Here we report on the dependence of the contact shape on an applied magnetic field. The nanocontacts were obtained from Dy wires by the mechanically controlled break-junction technique. In zero magnetic field we find the usual variation of the conductance G vs. electrode distance x while breaking the wire mechanically, with a sequence of steps and more or less prominent conductance plateaus. From the behavior G(x) we estimate the shape of the nanocontact after several cycles of mechanical deformation of the wire. We find that the final shape of the nanocontact depends on the strength and orientation of an applied magnetic field. This shaping under alternating tensile and compressive stress is attributed to the rearrangement of magnetic domains in magnetic field during formation of the nanocontact by magnetoelastic coupling.
[1] M. Müller et al., Nano Letters 11, 547 (2011)