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MA: Magnetismus

MA 15: Spin-Dependent Transport Phenomena II

MA 15.2: Vortrag

Dienstag, 28. März 2006, 10:30–10:45, HSZ 103

Domain wall resistance of nanosize contacts — •Michael Czerner, Bogdan Yu. Yavorsky, and Ingrid Mertig — Martin Luther University, FB Physik, FG Theorie, D-06099 Halle, Germany

Recent experimental results show a large ballistic magnetoresistance in nickel single-atom conductors [1,2]. The magnetic structure of low-dimensional systems, e.g., nanowires, influences the transport properties drastically [3]. Because of the complex geometry of nanocontacts stabilization of noncollinear magnetic configurations is highly possible. In this respect first-principle calculations of the magnetic order of nanowires are of great interest.

We present calculations of the electronic and magnetic structure of suspended nanowires based on density functional theory in the frame of a screened Korringa-Kohn-Rostoker method modified to noncollinear magnetic order [4]. Furthermore, ballistic conductance was calculated within the Landauer approach by means of KKR Green’s functions [5] generalized for noncollinear magnetic structures. We consider Fe,Co, and Ni chains suspended between two semi-infinite leads of the same material. We show that the realistic noncollinear magnetic order has considerable effect on the ballistic transport in the nanowires.

[1] N. Garcia et al., Phys.Rev.Lett. 82, 2923 (1999)

[2] M.R. Sullivan et al., Phys.Rev.B 71, 024412 (2005)

[3] V. Rodrigues et al., Phys.Rev.Lett. 91, 096801 (2003)

[4] B.Yu. Yavorsky et al., Phys.Rev.B 70, 014413 (2004)

[5] P. Mavropoulos et al., Phys.Rev.B 69, 125104 (2004)