Berlin 2008 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 35: Symposium: Atomic Wires at Surfaces II
(Invited Speakers: Erio Tosatti, Serge Lemay, Shuji Hasegawa)
O 35.1: Hauptvortrag (ohne Erstattung)
Dienstag, 26. Februar 2008, 14:00–14:30, HE 101
Magnetic phenomena, spin orbit effects, and electron transport in*nanowire contacts, particularly in Platinum — •Erio Tosatti1,2, Alexander Smogunov2,1, Andrea Dal Corso1, Anna Delin3, and Ruben Weht4 — 1SISSA and Democritos, Trieste, Italy — 2ICTP, Trieste, Italy — 3KTH Stockholm, Sweden — 4CNEA San Martin, Argentina
Nanocontacts between metal tips take in some instances the shape of ultra-thin suspended nanowires. Ballistic electron conductance through nanowire contacts is calculated based on plane wave/ultrasoft pseudopotential code developed to handle magnetism and spin orbit. As an application, the effect of magnetism on conductance will be demonstrated for monatomic contacts of 3d metals such as Ni and Co [1] with results in good agreement with break junction data.[2] Next, I will describe a new form of nanomagnetism, consisting of the spontaneous appearance of local magnetism at the nanocontact even in transition metals that are nonmagnetic in bulk such as Pt or Pd. The presence of nanomagnetism should in principle affect the conductance, as is demonstrated by direct calculation. Due to strong spin orbit, magnetism in a monatomic Pt nanowire or nanocontact should provide a novel case of "colossal magnetic anisotropy".[3] [1] A. Smogunov et al., Phys.Rev.B 70, 045417 (2004); Phys. Rev. B 74, 045429 (2006). [2] C. Untiedt, et al., Phys. Rev. B 69, 081401 (2004). [3] A. Delin and E. Tosatti, Phys. Rev. B 68, 144434 (2003); A. Delin, et al., Phys. Rev. Lett. 92, 057201 (2004); A. Smogunov, A Dal Corso, A. Delin, R. Weht and E. Tosatti, to be published.