Dipolar interactions in magnetic nanowire aggregates

Thomas Maurer 1 Fatih Zighem 2 Weiqing Fang 2 Frédéric Ott 2 Grégory Chaboussant 2 Yaghoub Soumare 3 Kahina Aït Atmane 3 Jean-Yves Piquemal 3 Guillaume Viau 4
1 LNIO - Laboratoire de Nanotechnologie et d'Instrumentation Optique
ICD - Institut Charles Delaunay
2 LLB - UMR 12 - Laboratoire Léon Brillouin
3 ITODYS UMR7086 - Interfaces, Traitements, Organisation et Dynamique des Systèmes
4 LPCNO - Laboratoire de physique et chimie des nano-objets
Abstract : We investigate the effect of dipolar interactions on the magnetic properties of nanowire aggregates. Micromagnetic simulations show that dipolar interactions between wires are not detrimental to the high coercivity properties of magnetic nanowires, even in very dense aggregates. This is confirmed by experimental magnetization measurements and Henkel plots, which show that the dipolar interactions are small. Indeed, we show that misalignment of the nanowires in aggregates leads to a coercivity reduction of only 30%. Direct dipolar interactions between nanowires, even as close as 2 nm, have small effects (maximum coercivity reduction of ∼15%) and are very sensitive to the detailed geometrical arrangement of the wires. These results strengthen the potential of elongated single domain particles for applications requiring high coercivity properties.
Keywords : Magnetic hysteresis Magnetic materials Transition metals Electromagnetism Nanowires Oxides Semiconductors Magnetic anisotropy Ferromagnetism Magnetic ordering
Document type :
Journal articles
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https://hal-utt.archives-ouvertes.fr/hal-02303878
Contributor : Daniel Gavrysiak <>
Submitted on : Wednesday, October 2, 2019 - 4:37:41 PM
Last modification on : Tuesday, October 15, 2019 - 8:54:05 AM

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Thomas Maurer, Fatih Zighem, Weiqing Fang, Frédéric Ott, Grégory Chaboussant, et al.. Dipolar interactions in magnetic nanowire aggregates. Journal of Applied Physics, American Institute of Physics, 2011, 110 (12), pp.123924. ⟨10.1063/1.3671540⟩. ⟨hal-02303878⟩

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