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No.1(pp.1-52)

Home > Issues > Volume 12 (2007) > No.1(pp.1-52)

Magnetization Behavior of Co Nanodot Array

Journal of Magnetics, Volume 12, Number 1, 31 Mar 2007, Pages 17-20

Joon-Yeon Chang*

(Center for Spintronics Research, Korea Institute of Science and Technology), B. A. Gribkov(Institute for Physics of Microstructures RAS), Hyung-Jun Kim(Center for Spintronics Research, Korea Institute of Science and Technology), Hyun-Cheol Koo(Center for Spintronics Research, Korea Institute of Science and Technology), Suk-Hee Han(Center for Spintronics Research, Korea Institute of Science and Technology), V. L. Mironov(Institute for Physics of Microstructures RAS), A. A. Fraerman(Institute for Physics of Microstructures RAS)

Abstract

We performed magnetic force microscopy (MFM) observation on array of Co dots in order to understand magnetic state and magnetization behavior of submicron sized Co dots patterned on GaMnAs bridge. MFM observations showed the magnetization reversal and processes of local magnetization of individual ferromagnetic Co nanodots. Magnetic state of Co dots either single domain or vortex is dependent on geometrical size and thickness. Transition from single domain to vortex state can be realized with MFM tip assisted local field. Magnetization reversal process takes place through sequential reversal of individual dots. Localized inhomogeneous magnetic field can be manipulated by controlling magnetic state of individual Co dot in the array structure.

Keywords: magnetic force microscopy; single domain; vortex

DOI:

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