Structure and magnetic properties of Co nanowires in self-assembled arrays

Abstract

Co nanowire arrays have been electrodeposited into self-assembled anodic aluminium oxide templates. It is found that the crystal structure of the Co nanowires depends on the pH value of the deposition electrolyte. The XRD results show that Co nanowires are fcc structure at pH = 2.7, amixture of structures of fcc and hcp at pH = 3.5, and hcp structure at pH = 5.0. The effective anisotropy along the nanowire axis of the fcc Co nanowire array is obviously stronger than that of the hcp Co nanowire array, and the coercivity of the fcc structure is also larger than that of the hcp structure when they are the same diameter.

Diameter‐Controllable Magnetic Properties of Co Nanowire Arrays by Pulsed Electrodeposition

“…Some works [19,20] have reported that the effective anisotropy of the magnetic nanowire arrays comes from the competition between the magnetocrystalline anisotropy and the shape anisotropy. For hcp-phase Co, magnetocrystalline anisotropy energy density K 1 = 5 × 10 6 erg/cm 3 is comparable to the shape anisotropy energy density πM S 2 = 6.0 × 10 6 erg/cm 3 [10], where M S is the saturation magnetization of Co. Magnetocrystalline anisotropy of the hcp Co nanowires will make the magnetic moment arrange along the c-axis which perpendicular to the nanowire's axis in our experiments, but the shape anisotropy tends to arrange the magnetic moment along the axis of the nanowires [20]. So the competition between magnetocrystalline anisotropy and shape anisotropy results in a relatively weak effective anisotropy along the nanowire's axis, which leads to the low coactivity.…”

Magnetic Interaction in FeCo Alloy Nanotube Array

“…Researches on magnetic nanowires and their arrays prepared in pores of AAO templates have plenty of outcomes [1][2][3][4][5]. In recent years, with the development of the methods for preparing magnetic nanotubes, the synthesis of tubular nanostructures and the studies on the magnetic properties of nanotubes are pioneered in magnetic nanotechnology.…”

Metal Nanowires Subjected to Relavant Hydrated Metal Ions

“…Cobalt (Co) and Nickel (Ni) nanowires have been electrochemically deposited into the pores of AAO template [26][27][28][29]. The earlier studies show that the growth surface of the fcc (Ni) [30,31] and hcp (Co) [32] [36].…”