Dresden 2014 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 10: Spin-dependent Transport Phenomena

MA 10.7: Vortrag

Montag, 31. März 2014, 16:45–17:00, HSZ 403

Emerging Magnetic Order in Pt atomic contacts and chains — •Florian Strigl, Christopher Espy, Maximilian Bückle, Torsten Pietsch, and Elke Scheer — Department of Physics, University of Konstanz, 78475 Konstanz, Germany

Platinum, as bulk metal, is not magnetically ordered, but it is a strong paramagnet close to the Stoner criterion of ferromagnetism. Several theoretical predictions exist about the formation of a magnetically ordered state in reduced dimensions and in particular in atomic chains [Smogunov, Thiess]. This makes it possible to study the influence of magnetic order on conductance properties of atomic contacts without influencing the contact geometry due to magnetostriction [Egle]. In this talk we will show results of a detailed experimental study in which we follow the evolution of magnetoconductance (MC) in atomic platinum contacts. The size, sign, and signature of single MC traces can vary largely even for slight changes on the contact and also show an anisotropic behavior. These features are similar to those found for atomic-size contacts of the 3d band magnets. We discuss how these findings may be put into context with a locally constricted magnetic order in the contact.

[Smogunov] Phys. Rev. B 78, 014423 (2008) [Thiess] Phys. Rev. B 81, 054433 (2010) [Egle] Phys. Rev. B 81, 134402 (2010)