AVS 50th International Symposium
    Magnetic Interfaces and Nanostructures Tuesday Sessions
       Session MI+NS-TuA

Paper MI+NS-TuA9
Magnetic Properties of Low-dimensional Nanostructures on an Insulator

Tuesday, November 4, 2003, 4:40 pm, Room 316

Session: Self Assembly and Nanomagnetism
Presenter: Z. Gai, Oak Ridge National Laboratory
Authors: Z. Gai, Oak Ridge National Laboratory
J.R. Thompson, Oak Ridge National Laboratory
J. Pierce, Oak Ridge National Laboratory
J. Shen, Oak Ridge National Laboratory
Correspondent: Click to Email
Magnetic nanostructured materials are attracting much attention because of the dramatic changes in their magnetic, electronic and transport properties compared with conventional bulk materials. In previous work, iron zero-dimensional dots, one-dimensional nanowires and two-dimensional films have been successfully prepared on top of a commonly used insulating NaCl (001) single crystal surface. In-situ atomic force microscopy images show that the sizes of the dots and the widths of the wires are very uniform; the films are atomically flat and are formed due to a high nucleation density. In the present work, the magnetic properties of the dots, wires and films are measured by Superconducting Quantum Interference Device (SQUID) magnetometer X-ray magnetic circular dichroism (XMCD). The wires have an out-of-plane easy magnetization axis, and surprisingly show ferromagnetic stability even at room temperature. The magnetic behaviors of the dots and films are very different from the wires. The detailed comparison will be discussed in the talk. Oak Ridge National Laboratory, managed by UT-Battelle, LLC, for the U.S. Dept. of Energy under contract DE-AC05-00OR22725.