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Open AccessArticle

Magnetic Structure of Ion-Beam Imprinted Stripe Domains Determined by Neutron Scattering

1
Institut Laue-Langevin, 71 Avenue des Martyrs, CS 20156, CEDEX 9, 38042 Grenoble, France
2
Institute of Physics and Center for Interdisciplinary Nanostructure Science and Technology (CINSaT), University of Kassel, Heinrich-Plett-Straße 40, D-34132 Kassel, Germany
3
Petersburg Nuclear Physics Institute, National Research Center “Kurchatov Institute”, 188300 Gatchina, Saint Petersburg, Russia
*
Author to whom correspondence should be addressed.
Nanomaterials 2020, 10(4), 752; https://doi.org/10.3390/nano10040752
Received: 5 March 2020 / Revised: 6 April 2020 / Accepted: 11 April 2020 / Published: 15 April 2020
We present a detailed analysis of the in-plane magnetic vector configuration in head-to-head/tail-to-tail stripe domain patterns of nominal 5 μm width. The patterns have been created by He-ion bombardment induced magnetic patterning of a CoFe/IrMn3 exchange bias thin-film system. Quantitative information about the chemical and magnetic structure is obtained from polarized neutron reflectometry (PNR) and off-specular scattering (OSS). The technique provides information on the magnetic vector orientation and magnitude along the lateral coordinate of the sample, as well as the chemical and magnetic layer structure as a function of depth. Additional sensitivity to magnetic features is obtained through a neutron wave field resonance, which is fully accounted for in the presented analysis. The scattering reveals a domain width imbalance of 5.3 to 3.7 μm of virgin and bombarded stripes, respectively. Further, we report that the magnetization in the bombarded stripe significantly deviates from the head-to-head arrangement. A domain wall of 0.6 μm with homogeneous magnetization direction is found to separate the two neighboring domains. The results contain detailed information on length scales and magnetization vectors provided by PNR and OSS in absolute units. We illustrate the complementarity of the technique to microscopy techniques for obtaining a quantitative description of imprinted magnetic domain patterns and illustrate its applicability to different sample systems. View Full-Text
Keywords: magnetic patterning; ion bombardment; magnetic domain; magnetic domain wall; magnetization vector; exchange bias; polarized neutron reflectometry; polarized neutron off-specular scattering magnetic patterning; ion bombardment; magnetic domain; magnetic domain wall; magnetization vector; exchange bias; polarized neutron reflectometry; polarized neutron off-specular scattering
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Saerbeck, T.; Huckfeldt, H.; Toperverg, B.P.; Ehresmann, A. Magnetic Structure of Ion-Beam Imprinted Stripe Domains Determined by Neutron Scattering. Nanomaterials 2020, 10, 752.

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