Magnetization reversal and magnetic anisotropy in ordered CoNiP nanowire arrays: effects of wire diameter

Sensors
Luu Van ThiemManh-Huong Phan

Abstract

Ordered CoNiP nanowires with the same length of 4 µm and varying diameters (d = 100 nm-600 nm) were fabricated by electrodeposition of CoNiP onto polycarbonate templates. X-ray diffraction, scanning electron microscopy, and high-resolution transmission electron microscopy confirmed the quality of the fabricated nanowires. Magnetic measurements and theoretical analysis revealed that the magnetization reversal and magnetic anisotropy were significantly influenced by varying of the diameters of the nanowires. There existed a critical wire diameter (dc ≈ 276 nm), below which the magnetization reversal occurred via a coherent rotation mode, and above which the magnetization reversal occurred via a curling rotation mode. The easy axis of the magnetization tended to change in direction from parallel to perpendicular with respect to the wire axis as the wire diameter exceeded dc ≈ 276 nm. With increasing wire diameter, the coercive field (Hc) and the remanent to saturation magnetization ratio (Mr/Ms) were also found to rapidly decrease in the range d = 100-400 nm and gradually decrease for d > 400 nm.

References

Oct 12, 2010·Nanotechnology·Luis De Los Santos ValladaresYutaka Majima
Jul 13, 2012·Nano Letters·Mazin M MaqablehBethanie J H Stadler

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Citations

Jun 22, 2018·Chemical Communications : Chem Comm·Jing WangJun Hu
Nov 2, 2019·Nanotechnology·Aleksandra SzkudlarekMarcin Sikora
Jun 9, 2020·Physical Chemistry Chemical Physics : PCCP·Yenni Velázquez-Galván, Armando Encinas

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Methods Mentioned

BETA
scanning
transmission
electron diffraction
X-ray

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