Dresden 2009 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 63: Semiconductor substrates: Adsorption

O 63.1: Vortrag

Freitag, 27. März 2009, 11:15–11:30, SCH A118

Magnetic Molecules on GaN Studied by Low Temperature STM — •Kendal Clark, Danda Acharya, Violeta Iancu, Erdung Lu, Arthur Smith, and Saw-Wai Hla — Ohio University, Physics and Astronomy Department, Athens, Ohio 45701, USA.

Spin electron interactions involving magnetic molecules and semiconductor surfaces are of great interest for the development of molecular spintronic devices. Due to its wide range of applications, GaN (0001) surface has received a special attention for the development of novel electronic devices. Here, we studied electronic and structural properties of TBrPP-Co molecules deposited on a freshly grown nitrogen polar GaN (0001) surface using a scanning tunneling microscopy and spectroscopy at 4.6 K under an ultra-high-vacuum condition. The TBrPP-Co molecule has a spin-active cobalt atom caged at the center of porphyrin unit and four bromo-phenyl groups are attached to its four corners. On GaN(0001), the molecules bind the surface through the bromo-phenyl units and form a saddle conformation, in which the central part of the molecule is bent by lifting the two pyrrole units of the porphyrin macrocycle. The molecules self-assemble and formed ordered clusters on GaN(0001) surface. Within the self-assembled molecular clusters, the molecules are aligned either parallel or 90 degree rotated to each other. In the presentation, we will discuss the spin-electron coupling of this molecule-surface system. This work is supported by the Ohio University BNNT, National Science Foundation NSF-DMR 0304314, NSF-PIRE: OISE 0730257, NSF-EMT: CCF-0622158, and the United States Department of Energy, DE-FG02-02ER46012 grants.