Stepwise magnetization reversal of geometrically tuned in diameter Ni and FeCo bi-segmented nanowire arrays

Magnetization reversal processes of hexagonal dense arrays of bi-segmented Ni and Fe 50 Co 50 nanowires consisting of two well defined diameters (45 and 80 nm) have been studied. The nanowires were grown inside of tailored pores of anodic alumina templates by combined anodization, atomic layer depos...

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Published in:Nano research 2019-07, Vol.12 (7), p.1547-1553
Main Authors: Palmero, Ester M., Méndez, Miguel, González, Silvia, Bran, Cristina, Vega, Víctor, Vázquez, Manuel, Prida, Víctor M.
Format: Article
Language:English
Subjects:
Aluminum oxide
Arrays
Atomic layer epitaxy
Atomic/Molecular Structure and Spectra
Biomedicine
Biotechnology
Chemistry and Materials Science
Coercivity
Condensed Matter Physics
Elongation
Hysteresis loops
Magnetic permeability
Magnetization reversal
Materials Science
Nanotechnology
Nanowires
Research Article
Segments
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Summary:Magnetization reversal processes of hexagonal dense arrays of bi-segmented Ni and Fe 50 Co 50 nanowires consisting of two well defined diameters (45 and 80 nm) have been studied. The nanowires were grown inside of tailored pores of anodic alumina templates by combined anodization, atomic layer deposition (ALD) and electrodeposition techniques. The experiments have allowed to identify their two-step magnetization reversal process ascribed to the respective segments of different diameter. This is concluded from the differential susceptibility observed in the hysteresis loops, contrary to those for nanowires with homogeneous diameter. These results are also confirmed by the first-order reversal curve (FORC) distribution diagrams, where an elongation parallel to the interaction axis around two coercive field values is obtained, which is correlated to the difference in diameter of the two segments. This well-defined two-step magnetization reversal process through the nanowire diameter design is thought to be very useful for the advanced control of the remagnetization in arrays of magnetic multidomain systems.
ISSN:1998-0124
1998-0000
DOI:10.1007/s12274-019-2385-9