(a) STM image of template of large scale. The surface is composed of rectangular domains. (b) Magnified STM image of template revealing that the domains are constructed from wide nanostripes. (c) Length-width plot of domains. [(d) and (e)] Width and length distribution of domains.
STM images of (a) 9 ML, (b) 13 ML, (c) 23 ML, and (d) 33 ML Fe nanoparticle assemblies on . The insets show the magnified images of the areas indicated by squares.
Statistics of Fe nanoparticle assemblies. (a) Nanoparticle density as a function of Fe coverage. [(b) and (c)] The particle width distributions and the length/width plots of 9 and 13 ML Fe nanoparticles. [(d) and (e)] The length/width plots of 23 and 33 ML Fe nanoparticles.
(a) Kerr remanence of n ML Fe deposited on recorded at RT. [(b)–(d)] In-plane MOKE hysteresis loops of 9, 13, and 33 ML Fe nanoparticle assemblies, measured at different azimuthal angles.
Angle dependence of and with fitting results. The inset shows the definition of and in the two-step MOKE hysteresis loops. The right panel reveals simulated hysteresis loops for 20° rotated sample in models (1) and (2). The black and red arrows indicate the directions of the fourfold and uniaxial anisotropy, respectively, in the models.
SEMPA images of as-grown 9–33 ML Fe nanoparticle assemblies at the same position after sequential deposition. The different colors indicate the magnetization directions.
(a) Magnified SEMPA image of 33 ML Fe nanoparticles. The arrows indicate the magnetization directions. The white circles mark the flux closure magnetic domain structures. (b) Line profile of the magnetization direction, as indicated in (a). The magnetization switches within 10 nm, about the size of a single nanoparticle. (c) The correlation functions of 9–33 ML Fe nanoparticles. The arrows indicate the magnetic correlation length to be and 350 nm for 9–13 and 23–33 ML Fe nanoparticles, respectively. (d) Histogram of angle differences between nearby pixels (pixel size: ) in SEMPA images of 9–33 ML Fe nanoparticles.
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