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Molecular Magnet: an Example of STM Application J. Wu Phys. Dept. C203 course.

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1 Molecular Magnet: an Example of STM Application J. Wu Phys. Dept. C203 course

2 Scanning Tunneling Microscope (STM) STM image of carbon nanotube The tunneling current from the tip is given by W is the barrier width, V is the voltage,  is the local density of the sample. Small-scale STM

3 Molecular Magnet: an interdisciplinary field Structure formula of CoPc Molecular Beam Epitaxy (MBE) Under ultra high vacuum 1*10 -10 , thermal heating CoPc source & sublimate it onto the substrate. Advantage: very clean Co atom carry magnetic moment.

4 Molecular observation and modification

5 3D model of CoPc and d-CoPc CoPc d-CoPc

6 Self-assembled multilayer CoPc

7 Zeeman splitting under magnetic field

8 Spin excitation of the molecular chain

9 Summary STM is a wonderful tool to observe and manipulate the nano-world. Molecular magnet is an interesting field with many open questions.

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