Dresden 2006 – wissenschaftliches Programm

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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

Dienstag, 28. März 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 Gösele³ — ¹Walter 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.