Investigation of micromagnetism and magnetic reversal of Ni nanoparticles using a magnetic force microscope |
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| Authors: | A A Bukharaev D V Ovchinnikov N I Nurgazizov E F Kukovitskii M Klaiber R Wiesendanger |
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| Institution: | (1) Kazan Physicotechnical Institute, Russian Academy of Sciences, 420029 Kazan, Russia;(2) Institute of Applied Physics, 20355 Hamburg, Germany |
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| Abstract: | Isolated Ni nanoparticles were studied in situ by atomic and magnetic force microscopy in the presence of an additional external field up to 300 Oe. By comparing topographic
and magnetic images, and also by computer modeling of magnetic images, it was established that particles smaller than 100
nm are single-domain and easily undergo magnetic reversal in the direction of the applied external magnetic field. For large
magnetic particles, the external magnetic field enhances the magnetization uniformity and the direction of total magnetization
of these particles is determined by their shape anisotropy. Characteristics of the magnetic images and magnetic reversal of
particles larger than 150 nm are attributed to the formation of a vortex magnetization structure in these particles.
Fiz. Tverd. Tela (St. Petersburg) 40, 1277–1283 (July 1998) |
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