Fig. 5
From: Growth of magnetic nanowires along freely selectable 〈hkl〉 crystal directions
Hybrid nanowires. a Cartoon illustrating bare, core–shell, axial hybrid, and lateral hybrid nanowires. b Magnetization curve of a single 〈100〉 FeCo nanowire measured by dynamic cantilever magnetometry18 along the easy axis. The saturation magnetization \(\mu _0M_{{\mathrm{sat}}} \sim 2.0 \pm 0.2{\kern 1pt}\; {\mathrm{T}}\) is considerably higher than that reported for other free-standing tips17. c Magnetization of nanowires following immersion in an acidic medium (pH = 3, HCl). Complete degradation is observed for free FeCo nanowires. Conversely, as little as 5 nm of conformal atomic-layer deposited (ALD) alumina completely protects the magnetic nanowires against degradation. d, e Secondary electron images and energy-dispersive X-ray spectroscopy images (colored insets) for Nb–FeCo and Ho–FeCo axial hybrids. Scale bars are 100 nm. f False-color SEM micrograph of a lateral FeCo hybrid with a 5 nm MgO interlayer. Scale bar is 100 nm
