Regensburg 1998 – wissenschaftliches Programm

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TT: Tiefe Temperaturen

TT 10: Postersitzung I: Ladungseffekte in Einelektronensystemen (1-6), Niedrigdimensionale Systeme (7-17), Transporteigenschaften und Pinning in HTSL (18-30), Symmetrie des Ordnungsparameters in HTSL (31-36), Korrelierte Elektronen: Theorie (37-79)

TT 10.11: Poster

Dienstag, 24. März 1998, 09:30–13:00, A

Shape-dependent magnetic-anisotropy energy of impurities in mesoscopic wires of dilute Fe_xAu_1−x alloys — •V. M. Fomin^1,2, V. N. Gladilin^1,2, and J. T. Devreese² — ¹Department of Theoretical Physics, State University of Moldova, Str. Mateevici 60, MD-2009 Kishinev, Republic of Moldova — ²Departement Natuurkunde, Universiteit Antwerpen (U.I.A.), Universiteitsplein 1, B-2610 Antwerpen, Belgium

The spin-orbit-induced magnetic anisotropy of the impurities in a nonmagnetic host is studied for mesoscopic wires with a rectangular cross-section taking into account roughness of their surfaces. A competition among the perpendicular to each other surfaces, which influences the impurity-spin state, results in a rather intricate co-ordinate dependence of the magnetic anisotropy energy as compared with the case of a semi-infinite host considered in [1]. Roughness of the surfaces enhances the splitting of the impurity-spin energy level. The calculated inhomogeneous probability for the electron scattering by the magnetic impurities is implicated to interpret the observed shape-dependent behavior of resistivity and thermopower in mesoscopic wires of dilute Fe_xAu_1−x alloys [2]. This work is supported by FWO-V, WOG and BOF NOI 97 (Belgium).

[1] O. Újsághy, A. Zawadowski, B. L. Gyorffy, Phys. Rev. Lett. 76, 2378 (1996)

[2] J. Eom, G. Neuttiens, C. Strunk, C. Van Haesendonck, Y. Bruynseraede, V. Chandrasekhar, Phys. Rev. Lett. 77, 2276 (1996)