Temperature dependent magnetic properties of Co nanowires and nanotubes prepared by electrodeposition method

Abstract

Co nanowires (NWs) and nanotubes (NTs) with same length and different diameter have been deposited in anodized aluminum oxide templates by electrodeposition method at the room temperature. The Co NWs show hcp structure while Co NTs show poor crystalline with no strong texture. The spontaneous magnetization of the Co NWs was found to be parallel to the nanowires, while Co NTs have a transverse spontaneous magnetization. Magnetization reversal occurs by curling mode in Co nanotubes while nucleation mode in Co nanowires. Temperature dependent magnetic properties show that the thermal energy decreases at low temperature causing an increase in coercivity and saturation magnetization. The dominance of shape anisotropy in case of Co NWs is manifested by the weak temperature dependence of the enhanced coercive field. Magnetostatic interactions and magnetocrystalline anisotropy is found dominant in case of Co NTs due to their distinct geometry.

Ion irradiation induced effects and magnetization reversal mechanism in (Ni 80 Fe 20 ) 1−x Co x nanowires and nanotubes

“…The current curiosity in logic devices based on the motion of magnetic domain walls (DWs) in nanowires and solid state memory has triggered a considerable interest in the spinpolarized current induced domain wall dynamics. In the light of theoretical prediction, the experiments in permalloy (Ni 80 Fe 20 ) nanowires depict that the domain wall velocity changes nonmonotonically as a function of applied magnetic field [1][2][3].…”

Magnetic properties of TiO2/Ni hybrid nanotube arrays by electrophoretic deposition

“…A more straightforward approach is the template technique in which the NTs/NWs are grown into pores of a template generally of a porous alumina. It is proved to be simple, cost-effective, and could precisely control the length, diameter, and composition of the NTs/NWs [7,8]. Although various magnetic metal or oxide NTs, such as Fe, Co, Ni, Fe 2 O 3 or Co 3 O 4 NTs, have been fabricated in the anodic alumina oxide (AAO) membranes by electro-deposition [9][10][11], limited information is available regarding the magnetic metal NTs grown into TiO 2 nanoporous arrays.…”

Hexagonal-Type Ising Nanowire with Core/Shell Structure Designed with Half-Integer Spins: Compensation Behaviors and Phase Diagrams in the Temperature and Interaction Planes

“…In particular, many researchers are interested on examining the magnetic phenomena of nanowires. In the experimental area, a variety of magnetic nanowires have been synthesized and their magnetic properties have been investigated, such as Fe-Co [40], Co-Pt [41], Ni [42], Ga 1−x Cu x N [43], Fe [44], Fe 3 O 4 [45], Co [46], Fe-Pt [47], Ni-Fe [48], and Co-Cu [49]. In theoretical area, the magnetic nanowires have been investigated within the various theoretical methods, such as MCS [50][51][52][53], EFT [10,[12][13][14][54][55][56][57][58][59][60][61], and MFA [62,63].…”