Needle-like domain structure in Co films deposited on Mo (1 1 0) |
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Authors: | M Tekielak R Schäfer J McCord A Maziewski V Zablotskii LT Baczewski A Wawro |
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Institution: | 1. Laboratory of Magnetism, Institute of Experimental Physics, University of Bialystok, Lipowa Str. 41, 15-424 Bialystok, Poland;2. Leibniz-Institut für Festkörper- und Werkstoffforschung Dresden e. V., Postfach 270 016, D-01171 Dresden, Germany;3. Institute of Physics, Czech Academy of Sciences, 18221, Na Slovance 2, Prague 8, Czech Republic;4. Institute of Physics Polish Academy of Sciences, Al. Lotnikow 32/46, 02-668 Warsaw, Poland |
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Abstract: | Magnetization reversal processes and domain structures have been studied in Mo(1 1 0)/Co(0 0 0 1)/Au(1 1 1) structures grown by molecular beam epitaxy on monocrystalline (11–20) sapphire substrates. Wedge-shaped samples with different Co thickness gradients relative to the Mo 0 0 1] direction were fabricated. Observation of the domain structure was performed at room temperature using Kerr microscopy in a Co thickness range varying from 5 to 50 nm, where the magnetization is oriented in the plane of the sample. A Co thickness-dependent coercivity field was determined through analysis of the domain wall position during the reversal process. A preferential orientation of magnetic domain walls was found, with the domains being needle-like. The orientation, as well as the size of the needles, depends on the Co thickness and the orientation of the magnetic field applied in the sample plane. |
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