Two-step magnetization reversal FORC fingerprint of coupled bi-segmented Ni/Co magnetic nanowire arrays
Garcia Fernandez J, Vega Martinez V, Thomas A, De La Prida Pidal VM, Nielsch K (2018)
Publication Type: Journal article
Publication year: 2018
Journal
Book Volume: 8
Article Number: 548
Journal Issue: 7
DOI: 10.3390/nano8070548
Abstract
First Order Reversal Curve (FORC) analysis has been established as an appropriate method to investigate the magnetic interactions among complex ferromagnetic nanostructures. In this work, the magnetization reversal mechanism of bi-segmented nanowires composed by long Co and Ni segments contacted at one side was investigated, as a model system to identify and understand the FORC fingerprint of a two-step magnetization reversal process. The resulting hysteresis loop of the bi-segmented nanowire array exhibits a completely different magnetic behavior than the one expected for the magnetization reversal process corresponding to each respective Co and Ni nanowire arrays, individually. Based on the FORC analysis, two possible magnetization reversal processes can be distinguished as a consequence of the ferromagnetic coupling at the interface between the Ni and Co segments. Depending on the relative difference between the magnetization switching fields of each segment, the softer magnetic phase induces the switching of the harder one through the injection and propagation of a magnetic domain wall when both switching fields are comparable. On the other hand, if the switching fields values differ enough, the antiparallel magnetic configuration of nanowires is also possible but energetically unfavorable, thus resulting in an unstable magnetic configuration. Making use of the different temperature dependence of the magnetic properties for each nanowire segment with different composition, one of the two types of magnetization reversal is favored, as demonstrated by FORC analyses.
Involved external institutions
Leibniz-Institut für Festkörper- und Werkstoffforschung Dresden e.V. (IFW) / Leibniz Institute for Solid State and Materials Research Dresden
Germany (DE)
Universidad de Oviedo
Spain (ES)
Germany (DE)
Universidad de Oviedo
Spain (ES)
How to cite
APA:
Garcia Fernandez, J., Vega Martinez, V., Thomas, A., De La Prida Pidal, V.M., & Nielsch, K. (2018). Two-step magnetization reversal FORC fingerprint of coupled bi-segmented Ni/Co magnetic nanowire arrays. Nanomaterials, 8(7). https://dx.doi.org/10.3390/nano8070548
MLA:
Garcia Fernandez, Javier, et al. "Two-step magnetization reversal FORC fingerprint of coupled bi-segmented Ni/Co magnetic nanowire arrays." Nanomaterials 8.7 (2018).
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