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Dresden 2006 – scientific programme

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MA: Magnetismus

MA 20: Poster: Films(1-36) Transp(37-56) Ex.Bias(57-67) Spindyn(68-80) Micromag(81-95) Particle(96-109) Imag.+Surface(110-113) Spinelectr(114-122) Theory+Micromag(123-131) Spinstr+Aniso(132-142) MagMat(143-156) Meas(157,158) MolMag+Kondo(159-162) Postdead(163-)

MA 20.145: Poster

Tuesday, March 28, 2006, 15:15–19:15, P1

Structural and magnetic properties of Mn5Ge3 clusters in a dilute magnetic germanium matrix — •Christian Jaeger1, Christoph Bihler1, Dieter Schlosser1, Thomas Vallaitis2, Mario Gjukic1, Martin S. Brandt1, Eckhard Pippel3, Jörg Woltersdorf3, and Ulrich Gösele31Walter Schottky Institut, Technische Universität München, Am Coulombwall 3, 85748 Garching, Germany — 2Universität Karlsruhe (TH), Institute of High-Frequency and Quantum Electronics, Engesserstr. 5, 76131 Karlsruhe, Germany — 3Max-Planck-Institut für Mikrostrukturphysik, Weinberg 2, 06120 Halle, Germany

Measurements of the total magnetization of Ge:Mn show that in many samples ferromagnetic inclusions must be present. We have characterized the structural and magnetic properties of low-temperature molecular-beam epitaxy (LT-MBE) grown Ge:Mn by means of high-resolution transmission electron microscopy (HR-TEM), energy dispersive x-ray spectroscopy (EDXS), and superconducting quantum interference device (SQUID) magnetometry. We find a coherent incorporation of Mn5Ge3 clusters in an epitaxially grown Ge:Mn matrix, which shows the characteristics of a diluted magnetic semiconductor (DMS) phase of Mn-doped Ge. The clusters are preferentially oriented with the hexagonal [0001] direction parallel to the [001] growth direction of the Ge:Mn matrix, as determined from both HR-TEM and SQUID measurements.

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