Nanoscale characterisation and magnetic properties of Co₈₁Cu₁₉/Cu multilayer nanowires

Abstract

Bamboo-like CoCu/Cu multilayer nanowires have been successfully fabricated into anodic aluminium oxide templates by using an electrodeposition method, and their chemistry and crystal structure characterised at the nanoscale. Energy-dispersive X-ray analysis indicated that the chemical composition of the regular periodic CoCu/Cu nanowires was Co 81 Cu 19 /Cu. Diffraction analysis revealed that Cu layers 10 and Co-rich layers exhibited polycrystalline fcc structure. A twin relationship of Cu layer {111} planes stacking on Co 81 Cu 19 layer {111} planes was observed at the lattice-resolution level. The magnetic properties analysed by experimental and theoretic simulations showed that there was a transition from a curling rotation mode to coherent rotation mode in our Co 81 Cu 19 /Cu multilayer nanowires when the angle between external field and nanowire length axis increased from 0° to 90°. This study highlights basic 15 morphological, chemical, structural information and magnetic reversal mechanism of CoCu/Cu nanowires, which are critical for the applications of multilayer nanowires in nanoscale sensors and electronics. 65 to the morphology, structure, chemistry and grain size of individual magnetic and non-magnetic layers. Besides, the performance of Co-Cu multilayer structures prepared by electrodeposition (ED) method [16][17][18] 22 is worse than that of physical deposition (PD) method. 26, 27 A number of published 70 work were devoted to figure out the intrinsic reasons between the GMR effect, magnetic properties of PD Co-Cu multilayer structures and their nanoscale characterisation, including morphology, chemistry, structure, interfaces and grain sizes. 26,27 However, the systemically nanoscale characterisation of 1D ED 75

Magnetic Configurations in Co/Cu Multilayered Nanowires: Evidence of Structural and Magnetic Interplay

“…The magnetic properties of nanowires have been studied in different systems through several works [11][12][13][14][15] .…”

Multi-Segmented Nanowires: A High Tech Bright Future

“…It was shown that during the deposition of Co-Cu layers, excess Cu segment was deposited because the exchange reaction was more than 1.4 nm [93,94]. Figure 5b shows the current density vs. time curve for multi-segmented Co Cu-Cu NWs [95]. Figure 5c shows the SEM image of the Co, Au and Cu interface [96].…”

How to Characterize Cylindrical Magnetic Nanowires

“…Specifically in nanowire characterization case, EDS is particularly useful to determine their chemical composition [27], their stoichiometry, and their impurity content. As mentioned before, since EDS is a local probe, it allows focusing on the nanowires, being either free or still in the alumina array (viewed in cross section).…”