Document Type

Thesis

Degree

Master of Science (MS)

Department

Physics

First Advisor's Name

Jianch Zhang

First Advisor's Committee Title

Committee Chair

Second Advisor's Name

Wenzhi Li

Third Advisor's Name

Yesim Darici

Fourth Advisor's Name

Kevin E. O'Shea

Fifth Advisor's Name

Xuewen Wang

Date of Defense

5-19-2008

Abstract

This research investigated the growth of cobalt magnetic nanodots on the rutile TiO2 (110) surface. Well ordered TiO2 (110) surface was prepared in the Ultra High Vacuum (UHV) via Ar+ sputtering and annealing. Co was deposited in-situ by Molecular Beam Epitaxy (MBE). Characterization of the growth was performed in-situ by a Variable Temperature Scanning Tunneling Microscope (VT-STM). The TiO2 (110) surface was proven to promote the Volmer-Weber growth of Co nanodots. The cobalt atoms formed small clusters at the stage of initial growth. As the coverage increased, the size and density of clusters increased. It was discovered that there existed a stable dot size, especially after a delicate post-annealing. Statistical analysis showed the stable size of nanodots was 4.0 ± 0.5 nm. The existence of the stable dot size was supported theoretically based on jellium model. An optimal set of fabrication parameters was established for the uniform magnetic nanodot growth.

Identifier

FI14052528

Comments

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