The magneto-optical properties of annealed Co96Pt4 nanowire arrays

Abstract

The magneto-optical (MO) properties of highly ordered arrays of electrodeposited Co96Pt4 alloy nanowires embedded in anodic aluminum oxide (AAO) membranes have been studied as a function of annealing temperature (TA). The initial measurements yielded the four Stokes parameters from which the Faraday rotation angle (FRA) and ellipticity (tanχ) were extracted. The FRA was determined as 8.0×103deg∕cm for the as-deposited sample. After annealing at 300°C the FRA attained a maximum of 1.1×104deg∕cm (an increase of 38%), but thereafter declined monotonically as TA was increased to 650°C. The ellipticity shows a similar behavior with TA. However, the corresponding variation in saturation magnetization (Ms) with TA does not match that of the magneto-optical constants, which suggests that factors other than Ms also determine the values of FRA and tanχ. The data obtained indicate that a suitable annealing regime is an effective method to optimize the MO properties of AAO-based magnetic nanowire arrays.

Nanomagnet arrays fabricated by electrodeposition using self-assembled anodic aluminium oxide templates

“…Nanowires with a higher atomic ratio of Co:Pt, e.g. Co 96 Pt 4 has also been fabricated under identical deposition conditions though a much concentrated electrolyte was used with an EDT period of 40 s. The average nanowire length is about 0.49 lm, suggesting a much higher average growth rate possibly due to the much higher Co ion concentration in the bath [7].…”

Electroless synthesis of large scale Co–Zn–P nanowire arrays and the magnetic behaviour

“…Fabrication of magnetic nanowire arrays has become the subject of intensive study [1][2][3][4] due to their potential applications in ultra-high-density magnetic storage devices and microsensors [5]. The properties and applications of magnetic nanowire arrays arise from their inherent shape anisotropy and the low dimension.…”

A Magnetic and Magneto-Optical Investigation of Co-Pt Alloy Nanowire Arrays

“…However, up to now, although many works about magnetic properties and magneto optical Kerr effect (MOKE) of multilayer and thin films have been reported, there are relatively few reports on the fundamental magneto-optical Faraday effect (MOFE) of nanowire arrays. [3][4][5][6] In our previous work [3][4][5] the MO properties of nanowire arrays as a function of wire diameter, wire length and annealing temperature have been studied. In this paper, we report an investigation on the compositional-dependent magnetic and MO properties of 14 nm diameter Co-Pt alloy nanowire arrays embedded in anodic aluminum oxide (AAO).…”