title: Ge(1-x) Mn(x) clusters: central structural and magnetic building blocks of nanoscale wire-like self-assembly in a magnetic semiconductor.
abstract: Controlled nanoscale self-assembly of magnetic entities in semiconductors opens novel perspectives for the tailoring of magnetic semiconductor films and nanostructures with room temperature functionality. We report that a strongly directional self-assembly in growth direction in Mn-alloyed Ge is due to a stacking of individual Ge(1-x)Mn(x) clusters. The clusters represent the relevant entities for the magnetization of the material. They are formed of a core-shell structure displaying a Mn concentration gradient. While the magnetic moments seem to be carried by the shells of the clusters, their core is magnetically inactive.
authors.affiliation: Walter Schottky Institut, Technische Universitat Munchen, Am Coulombwall 3, D-85748 Garching, Germany. bougeard@wsi.tum.de
authors.forename: D
authors.initials: D
authors.lastname: Bougeard
authors.forename: N
authors.initials: N
authors.lastname: Sircar
authors.forename: S
authors.initials: S
authors.lastname: Ahlers
authors.forename: V
authors.initials: V
authors.lastname: Lang
authors.forename: G
authors.initials: G
authors.lastname: Abstreiter
authors.forename: A
authors.initials: A
authors.lastname: Trampert
authors.forename: J M
authors.initials: JM
authors.lastname: Lebeau
authors.forename: S
authors.initials: S
authors.lastname: Stemmer
authors.forename: D W
authors.initials: DW
authors.lastname: Saxey
authors.forename: A
authors.initials: A
authors.lastname: Cerezo