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Issue 9, 2016
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Domain configurations in Co/Pd and L10-FePt nanowire arrays with perpendicular magnetic anisotropy

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Abstract

Perpendicular magnetic anisotropy [Co/Pd]15 and L10-FePt nanowire arrays of period 63 nm with linewidths 38 nm and 27 nm and film thickness 27 nm and 20 nm respectively were fabricated using a self-assembled PS-b-PDMS diblock copolymer film as a lithographic mask. The wires are predicted to support Néel walls in the Co/Pd and Bloch walls in the FePt. Magnetostatic interactions from nearest neighbor nanowires promote a ground state configuration consisting of alternating up and down magnetization in adjacent wires. This was observed over ∼75% of the Co/Pd wires after ac-demagnetization but was less prevalent in the FePt because the ratio of interaction field to switching field was much smaller. Interactions also led to correlations in the domain wall positions in adjacent Co/Pd nanowires. The reversal process was characterized by nucleation of reverse domains, followed at higher fields by propagation of the domains along the nanowires. These narrow wires provide model system for exploring domain wall structure and dynamics in perpendicular anisotropy systems.

Graphical abstract: Domain configurations in Co/Pd and L10-FePt nanowire arrays with perpendicular magnetic anisotropy

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Publication details

The article was received on 13 Dec 2015, accepted on 04 Feb 2016 and first published on 05 Feb 2016


Article type: Paper
DOI: 10.1039/C5NR08865H
Citation: Nanoscale, 2016,8, 5358-5367
  • Open access: Creative Commons BY license
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    Domain configurations in Co/Pd and L10-FePt nanowire arrays with perpendicular magnetic anisotropy

    P. Ho, K. Tu, J. Zhang, C. Sun, J. Chen, G. Liontos, K. Ntetsikas, A. Avgeropoulos, P. M. Voyles and C. A. Ross, Nanoscale, 2016, 8, 5358
    DOI: 10.1039/C5NR08865H

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