Reply to the 'Comment on "Ultralow magnetostrictive flexible ferromagnetic nanowires"' by D. Faurie, N. Challab, M. Haboussi, and F. Zighem, Nanoscale, 2022, 14, DOI: 10.1039/D1NR01773J

Abstract

In the comment to our paper, D. Faurie et al. have carried out simulations on Co-nanowires subjected to tensile stress perpendicular to the length of the nanowires. According to their simulation, the low effective magnetostriction constant of the Co nanowires results from a very low transfer of stress. They suggest that a higher transfer of stress would be obtained if the wires are bent along the length of the nanowires. Here we compare the result of magneto-optical experiments conducted by bending the nanowires both along and perpendicular to their long axis. The obtained effective magnetostriction of the Co-nanowires is, within the experimental resolution, independent of the bending direction.

Fig. 1. Example of M(H) curves for (a) tensile stress applied perpendicularly and (b) compressive stress applied parallel to the nanowire length as a function of the radius of curvature/stress, as illustrated in the inset sketches of each panel. (c) The corresponding values of coercivity vs. applied stress for tensile stress applied perpendicular to the nanowires (blue circles, data provided in the original published manuscript) and compressive stress applied parallel to the nanowires (red triangles). The lines represent the fit of eqn (1) to the experimental data.