Compositionally graded and diameter modulated magnetic nanowires for domain wall mediated spintronic devices

Synopsis

Magnetic nanowires have attracted much attention for magnetic random access memory, spin torque devices and domain-wall movement controlled based spintronic devices. “Domain wall traps” have been engineered and well-exploited in nanostrips by creating a geometrical trapping site, e.g. a single notch along a stripe, compared to diameter-modulated (DM) cylindrical magnetic nanowires (NWs) where multi-segmented DM-NWs have been generally studied. Template electrodeposition is an established and widely studied method for fabricating magnetic nanowires [1]. However, the diameter or compositionally modulated magnetic nanowires have been more recently exploited for versatile capability in manipulating domain wall movement. We have developed template electrodeposition [2] using anodic aluminium oxide membranes to produce the nanowires under particular conditions. Here is this talk; I focus on two types of nanowire systems studied in my group including (1) compositionally-graded FePt nanowires and (2) diameter-modulated nickel nanowires. This type of geometrically engineered nanowires exhibit potential efficiency for future novel spintronic devices in particular when assembled in arrays of nanowires as a practical three-dimensional memory device.

[1] F. Nasirpouri and A. Nogaret, Nanomagnetism and Spintronics, world sci. pub. Co, 2011.
[2] F. Nasirpouri, Electrodeposition of Nanostructured Materials, Springer International. Pub., Switzerland, 2017.
[3] A. Fardi, F Nasirpouri, C Bran, et al J Solid State Chem, 2016, 244, 35.
[4] F. Nasirpouri, SM Peighambari et al, Sci. Rep. (Nature), 2019, 9, 9010.