Abstract
This letter reports a facile approach for morphologic control of complex oxide nanostructures patterned by "soft" electron beam lithography (soft- eBL). The authors demonstrate fabrication of epitaxial nanofrustum and nanopyramidal morphologies of ferroelectric BaTi O3 and magnetic Co Fe2 O4 lines, with controlled zig-zag or smooth edges. The dimensional and shape control is achieved by simply tuning the patterning parameters such as resist thickness and patterning directions with respect to underlying substrate orientation. The crystal orientation, element distribution, and piezoelectric behavior of BaTi O3 nanofrustums are evaluated with analytical transmission electron microscopy and piezoresponse force microscopy. It is argued that soft- eBL allows for exquisite control over morphology, shape evolution, and orientation of zero- and one-dimensional nanostructures akin to what has been possible in the past with semiconductor heterostructures by thin film approaches.
| Original language | English (US) |
|---|---|
| Article number | 143105 |
| Journal | Applied Physics Letters |
| Volume | 91 |
| Issue number | 14 |
| DOIs | |
| State | Published - 2007 |
Funding
The authors thank Dr. J. M. Hiller of Electron Microscopy Center, Argonne National Laboratory for help in preparing TEM sample with FIB lift-off technique, and Dr. O. Auciello of Materials Science Division, Argonne National Laboratory for help in Sr Ru O 3 deposition. This work was supported by the NSF-NSEC (Award No. EEC-0647560), NSF-MRSEC (DMR No. 0520513), and the U.S. Department of Energy (DOE-BES). The research work was performed in the EPIC and NIFTI facilities of the NU ANCE Center at Northwestern University. NU ANCE Center is supported by NSF-NSEC, NSF-MRSEC, the State of Illinois, and Northwestern University.
ASJC Scopus subject areas
- Physics and Astronomy (miscellaneous)