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28 Sep 2009

Volume 95, Issue 13, Articles (13xxxx)

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Appl. Phys. Lett. 95, 131107 (2009); http://dx.doi.org/10.1063/1.3236752 (3 pages)

Marcus Eichfelder, Wolfgang-Michael Schulz, Matthias Reischle, Michael Wiesner, Robert Roßbach, Michael Jetter, and Peter Michler
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Ferromagnet-semiconductor nanowire coaxial heterostructures grown by molecular-beam epitaxy

M. Hilse, Y. Takagaki, J. Herfort, M. Ramsteiner, C. Herrmann, S. Breuer, L. Geelhaar, and H. Riechert

Appl. Phys. Lett. 95, 133126 (2009); http://dx.doi.org/10.1063/1.3240405 (3 pages) | Cited 7 times

Online Publication Date: 2 October 2009

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GaAs–MnAs core-shell structures are grown by molecular-beam epitaxy using wurtzite GaAs nanowires on GaAs(111)B. The nanowire structures curve due to the strain at the heterointerface when the substrate is not rotated during the growth, evidencing the diffusion length in the MnAs overgrowth being less than the perimeter of the columns. The MnAs growth is thus demonstrated to take place by direct deposition on the sidewall. The MnAs envelope is m-plane-oriented with the c-axis along the nanowire axis. The magnetic easy axis hence lies in the surface plane of the substrate, which is confirmed by magnetization measurements and magnetic-force microscopy.
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73.40.Kp III-V semiconductor-to-semiconductor contacts, p-n junctions, and heterojunctions
61.46.Km Structure of nanowires and nanorods (long, free or loosely attached, quantum wires and quantum rods, but not gate-isolated embedded quantum wires)
66.30.Pa Diffusion in nanoscale solids
75.75.-c Magnetic properties of nanostructures
73.63.Nm Quantum wires
81.15.Hi Molecular, atomic, ion, and chemical beam epitaxy
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects
68.37.Rt Magnetic force microscopy (MFM)
75.50.Pp Magnetic semiconductors
75.50.Dd Nonmetallic ferromagnetic materials
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