AVS 46th International Symposium
    Magnetic Interfaces and Nanostructures Technical Group Thursday Sessions
       Session MI+NS-ThM

Paper MI+NS-ThM3
Magnetism of Interconnected Co Nanodots Grown on the N-modified Cu(001) Surface

Thursday, October 28, 1999, 9:00 am, Room 618/619

Session: Patterned or Self-Assembled Magnetic Nanostructures
Presenter: K.D. Lee, University of Tokyo, Japan
Authors: K.D. Lee, University of Tokyo, Japan
T. Iimori, University of Tokyo, Japan
F. Komori, University of Tokyo, Japan
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Square arrays of ultrathin Co nano-size dots interconnected by 1 monolayer-height Co nanostripes are grown on the N-modifed Cu(001)c(2x2) substrate. Scanning tunneling microscopy shows the Co atoms are nucleated at the naked Cu(001) substrate exposed between ordered arrays of c(2x2) square patches forming such a novel Co nanostructure. The sizes of Co dots and interconnecting nanostripes are controlled by the amount of Co deposition at room temperature. Magnetic properties of these nanostructures have been investigated by using magento-optical Kerr effect between 100 K and 450 K. Analysis of hysteresis loops as a funtion of temperature as well as thickness reveals that these Co dot arrays have remarkably different magnetic properties from ultrathin fcc Co films grown on clean Cu(001) surface with the same average thickness, such as two-step increase of the saturation magnetization and coercivity with decreasing temperature. We attribute these novel magnetic properties to the magnetic interaction among Co dots mediated by the interconnecting Co stripes.