Next Article in Journal
Facile Ag-Film Based Surface Enhanced Raman Spectroscopy Using DNA Molecular Switch for Ultra-Sensitive Mercury Ions Detection
Next Article in Special Issue
A Comparative Study of Magnetic Properties of Large Diameter Co Nanowires and Nanotubes
Previous Article in Journal
High-Aspect Ratio β-Ga2O3 Nanorods via Hydrothermal Synthesis
Previous Article in Special Issue
Two-Step Magnetization Reversal FORC Fingerprint of Coupled Bi-Segmented Ni/Co Magnetic Nanowire Arrays
Article

Effect of Sharp Diameter Geometrical Modulation on the Magnetization Reversal of Bi-Segmented FeNi Nanowires

1
Departamento de Física, Universidad de Oviedo, C/Federico Garcia Lorca 18, 33007-Oviedo, Asturias, Spain
2
Laboratorio Membranas Nanoporosas, Servicios Científico-Técnicos, Universidad de Oviedo, Campus El Cristo s/n, 33006-Oviedo, Asturias, Spain
*
Author to whom correspondence should be addressed.
Nanomaterials 2018, 8(8), 595; https://doi.org/10.3390/nano8080595
Received: 14 July 2018 / Revised: 1 August 2018 / Accepted: 2 August 2018 / Published: 5 August 2018
(This article belongs to the Special Issue Synthesis and Characterization of Nanowires)
Controlling functional properties of matter and combining them for engineering a functional device is, nowadays, a common direction of the scientific community. For instance, heterogeneous magnetic nanostructures can make use of different types of geometrical and compositional modulations to achieve the control of the magnetization reversal along with the nano-entities and, thus, enable the fabrication of spintronic, magnetic data storage, and sensing devices, among others. In this work, diameter-modulated FeNi nanowires are fabricated paying special effort to obtain sharp transition regions between two segments of different diameters (from about 450 nm to 120 nm), enabling precise control over the magnetic behavior of the sample. Micromagnetic simulations performed on single bi-segmented nanowires predict a double step magnetization reversal where the wide segment magnetization switches near 16 kA/m through a vortex domain wall, while at 40 kA/m the magnetization of the narrow segment is reversed through a corkscrew-like mechanism. Finally, these results are confirmed with magneto-optic Kerr effect measurements at the transition of isolated bi-segmented nanowires. Furthermore, macroscopic vibrating sample magnetometry is used to demonstrate that the magnetic decoupling of nanowire segments is the main phenomenon occurring over the entire fabricated nanowires. View Full-Text
Keywords: anodization; atomic layer deposition; diameter modulated nanowire; micromagnetic simulation; ferromagnetic nanowire; MOKE; domain wall; magnetization reversal; Barkhausen jump anodization; atomic layer deposition; diameter modulated nanowire; micromagnetic simulation; ferromagnetic nanowire; MOKE; domain wall; magnetization reversal; Barkhausen jump
Show Figures

Graphical abstract

MDPI and ACS Style

Méndez, M.; Vega, V.; González, S.; Caballero-Flores, R.; García, J.; Prida, V.M. Effect of Sharp Diameter Geometrical Modulation on the Magnetization Reversal of Bi-Segmented FeNi Nanowires. Nanomaterials 2018, 8, 595. https://doi.org/10.3390/nano8080595

AMA Style

Méndez M, Vega V, González S, Caballero-Flores R, García J, Prida VM. Effect of Sharp Diameter Geometrical Modulation on the Magnetization Reversal of Bi-Segmented FeNi Nanowires. Nanomaterials. 2018; 8(8):595. https://doi.org/10.3390/nano8080595

Chicago/Turabian Style

Méndez, Miguel, Víctor Vega, Silvia González, Rafael Caballero-Flores, Javier García, and Víctor M. Prida. 2018. "Effect of Sharp Diameter Geometrical Modulation on the Magnetization Reversal of Bi-Segmented FeNi Nanowires" Nanomaterials 8, no. 8: 595. https://doi.org/10.3390/nano8080595

Find Other Styles
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Back to TopTop