On the growth mechanism of nickel and cobalt nanowires and comparison of their magnetic properties

Abstract

Magnetic nanowires (NWs) are ideal materials for the fabrication of various multifunctional nanostructures which can be manipulated by an external magnetic fi eld. Highly crystalline and textured nanowires of nickel (Ni NWs) and cobalt (Co NWs) with high aspect ratio (~330) and high coercivity have been synthesized by electrodeposition using nickel sulphate hexahydrate (NiSO 4 ·6H 2 O) and cobalt sulphate heptahydrate (CoSO 4 ·7H 2 O) respectively on nanoporous alumina membranes. They exhibit a preferential growth along 110 . A general mobility assisted growth mechanism for the formation of Ni and Co NWs is proposed. The role of the hydration layer on the resulting one-dimensional geometry in the case of potentiostatic electrodeposition is verified. A very high interwire interaction resulting from magnetostatic dipolar interactions between the nanowires is observed. An unusual low-temperature magnetisation switching for fi eld parallel to the wire axis is evident from the peculiar high fi eld M(T) curve.

Large-scale synthesis of Au–Ni alloy nanowires using electrochemical deposition

“…This dipolar field will act as a demagnetization field. The effect of high dipolar interactions for perpendicular fields results in the reduced magnetization (Narayanan et al 2008).…”

Magnetic field alignment of template released ferromagnetic nanowires

“…Further details of nanowires fabrications are presented elsewhere. [1][2][3][11][12][13] The nanowire filled templates were subdivided into small sections and placed in 2 M NaOH to dissolve the alumina templates for a time of $48 hours at room temperature. The nanowires were washed repeatedly with distilled water and then with isopropanol (IPA).…”

“…A variety of nanostructures can be formed from nanodots 15,16 to nanotubes [17][18][19] with cylindrical nanowires most commonly prepared. [1][2][3][4][5][6][7][8][9][10][11][12][13][14] In many studies, the as-deposited templated arrays of nanowires have been investigated, and this has produced significant insight into the physical behaviour of these nanowires. [1][2][3][4][5][6][7][8][9][10][11][12][13][14] More recently, isolated individual nanowires have been studied, and these studies present the opportunity to investigate the intrinsic behaviour of individual nanowires.…”

“…[1][2][3][4][5][6][7][8][9][10][11][12][13][14] In many studies, the as-deposited templated arrays of nanowires have been investigated, and this has produced significant insight into the physical behaviour of these nanowires. [1][2][3][4][5][6][7][8][9][10][11][12][13][14] More recently, isolated individual nanowires have been studied, and these studies present the opportunity to investigate the intrinsic behaviour of individual nanowires. [20][21][22][23][24] Isolated nanowires are obtained by releasing the nanowires from the templates using a suitable chemical solution to dissolve the template without damaging the nanostructures.…”

Структура И Физические Свойства Железных Нанотрубок, Полученных Методом Темплатного Синтеза

“…Известно, что электроосаждение железа в поры тем-платов обычно происходит в четыре стадии [21][22][23], которые хорошо видны на временной зависимости про-цесса (рис. 1, а).…”