| AVS 54th International Symposium | |
| Magnetic Interfaces and Nanostructures | Wednesday Sessions |
| Session MI-WeA |
| Session: | Nanomagnetic Imaging and Spectroscopy |
| Presenter: | L. Gao, Oak Ridge National Laboratory |
| Authors: | L. Gao, Oak Ridge National Laboratory Z. Gai, Oak Ridge National Laboratory S. Retterer, Oak Ridge National Laboratory J.D. Fowlkes, Oak Ridge National Laboratory J. Shen, Oak Ridge National Laboratory |
| Correspondent: | Click to Email |
Thin films of ferromagnetic magnetic materials with lithographically designed geometries are model systems for the study of artificial spin ice or frustrated systems.1 In this work, the square lattices, which are composed of four rectangular elements, were fabricated using electron beam lithography and lift-off technique. The frustrated magnetic domain structures of the square lattices were investigated using magnetic force microscope (MFM) and scanning electron microscope with polarization analysis (SEMPA). The magnetic structure of individual permalloy element is dominated by the shape anisotropy. Single domain can be obtained by optimizing the size and the aspect ratio of the element. The lattice spacing and size of elements were changed to investigate the interactions between elements and their effects on the moment configurations. The correlations between the elements decrease with increasing spacing and decreasing size of elements. The temperature and magnetic field dependences of the moment configuration of the lattices will be presented at the meeting. This research was conducted at the Center for Nanophase Materials Sciences, which is sponsored at Oak Ridge National Laboratory by the Division of Scientific User Facilities, U.S. Department of Energy.
1 R. F. Wang, C. Nisoli, R. S. Freitas, J. Li, W. McConville, B. J. Cooley, M. S. Lund, N. Samarth, C. Leighton, V. H. Crespi, and P. Schiffer, Nature 439, 303 (2006).