Berlin 2015 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 103: Transport: Poster Session
TT 103.18: Poster
Donnerstag, 19. März 2015, 15:00–18:00, Poster B
Emerging Magnetism in transition metal atomic contacts — •Martin Keller1, Amin Karimi1, Florian Strigl1, Bernat Olivera2, Carlos Untiedt2, Elke Scheer1, and Torsten Pietsch1 — 1Department of Physics, University of Konstanz, 78467 Konstanz, Germany — 2Department of Applied Physics, University of Alicante, 03690 Alicante, Spain
Transition metals which are a strong paramagnet (Pd, Pt) or have only weak magnetic order (Gd) show fascinating magnetic properties in reduced dimensions. For Pd nanowires anisotropic magnetotransport magnetic effects are theoretically predicted [1,2], while, as we show, Gd exhibits large magnetostriction in atomic contacts. These properties can be examined by investigating the magnetoconductance (MC) of controlled atomic-size junctions of these materials. Additional a study of the shot noise of such atomic junctions provides information that cannot be easily obtained by other means, such as the determination of the transmission probability and the number of electronic conductance channels [3]. Here we show a comprehensive experimental study of MC and shot noise of atomic contacts of these metals. We also develop a minimal model for magnetic configuration of the contatcs to account for the complex MC behavior.
[1] Delin et al., Phys. Rev. Lett. 92, 057201 (2004).
[2] Smelova et al., Phys. Rev. B. 77, 033408 (2008).
[3] Brom et al., Phys. Rev. Lett. 82, 1526 (1999).