AVS 51st International Symposium
    Nanometer-scale Science and Technology Monday Sessions
       Session NS-MoA

Paper NS-MoA5
Spin-Polarized Scanning Tunneling Microscopy Study of Single-Crystallized Nanodot Arrays

Monday, November 15, 2004, 3:20 pm, Room 213D

Session: Magnetic Imaging and Spectroscopy
Presenter: T.-H. Kim, Seoul National University, South Korea
Authors: T.-H. Kim, Seoul National University, South Korea
J.H. Choi, Seoul National University, South Korea
J. Seo, Seoul National University, South Korea
Y. Kuk, Seoul National University, South Korea
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We have developed a method to grow regularly patterned Fe nanodot arrays with in situ deposition. A self-sustained porous alumina mask was fabricated with an aluminum-coated Si substrate. Using the alumina shadow mask with perfectly ordered pores, we fabricated well-ordered Fe nanodot arrays.@footnote 1@ Fe nanodot arrays with 0.2-10 nm thicknesses, 50-120 nm diameters, and 100-200 nm periods were successfully grown on a W(110) substrate in ultra-high vacuum. Fe nanodots were single-crystallized by mild annealing. Our shadow mask technique can be the simple and fast method to obtain high-density arrays over a macroscopic area. Spin-polarized scanning tunneling microscopy (SP-STM), one of the most powerful techniques to study magnetic nanostructures, can image surface domain structures with a lateral resolution reaching the atomic scale.@footnote 2@ Well-ordered Fe nanodot arrays showed a stronger magnetic interaction between dots than randomly distributed Fe islands. We have performed micromagnetic simulation@footnote 3@ to study interaction between dots. @FootnoteText@ @footnote 1@ J. H. Choi, T.-H. Kim, J. Seo, and Y. Kuk (submitted to APL).@footnote 2@ S. Heinze, M. Bode, A. Kubetzka, O. Pietzsch, X. Nie, S. Blugel, and R. Wiesendanger, Science 288, 1805 (2000).@footnote 3@ We used the OOMMF program (http://math.nist.gov/oommf/). .