Diameter-modulated ferromagnetic CoFe nanowires

Abstract

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Controlled Electrodeposition and Magnetic Properties of Co35Fe65Nanowires with High Saturation Magnetization

“…Unfortunately, some complexing organic non-saccharin additives in electrodeposition of TM alloys, caused more than 40% decrease of B s -value due to the incorporation of oxygen compounds into the deposit. [34][35][36][37] Use of ascorbic acid (AA) as a reducing agent for Fe +3 ions in the preparation of CoFe nanowires, [15][16][17][18][19][20][21][22][23][24][25][26] is efficient for deaerated plating solution in the short term. However, over longer times accumulated dehydroascorbic acid (DHAA), formed in the redox reaction, is subjected to hydrolysis giving rise to several possible bidentate nucleophiles.…”

“…[28][29][30][31] In industrial electrodeposition of 2.4 T CoFe films the problem of accumulation of Fe +3 ions in solution is solved by continues chemical reduction of Fe +3 to Fe +2 ions. In laboratory preparation of CoFe nanowire arrays ascorbic acid can be used as a reducing agent for Fe +3 ions, [15][16][17][18][19][20][21][22][23][24][25][26][27] and this will be discussed later in the text. The second major challenge in the electrodeposition of CoFe alloys is that they experience a phenomena known as an anomalous codeposition, which is characterized by the anomaly that the less noble metal, i.e.…”

“…14 In the last decade, methods of electrodeposition, as well as the structural and magnetic properties of CoFe nanowire arrays have been extensively investigatied, [15][16][17][18][19][20][21][22][23][24][25][26][27] since CoFe materials have high * Electrochemical Society Member. z E-mail: tabakovicibro@gmail.com saturation magnetization, low coercivity and high magnetic shape anisotropy.…”

“…13 Therefore, controlled deposition to obtain magnetic nanostructures with a high saturation magnetization could be promising for new T2 MRI contrast agents. 14 In the last decade, methods of electrodeposition, as well as the structural and magnetic properties of CoFe nanowire arrays have been extensively investigatied, [15][16][17][18][19][20][21][22][23][24][25][26][27] since CoFe materials have high saturation magnetization, low coercivity and high magnetic shape anisotropy. In order to produce pure CoFe alloy with targeted composition and very high saturation magnetization (B s ≥ 2.4 T), one has to overcome two major challenges.…”

Template-Free Fabrication of Diameter-Modulated Co-Zn/Oxide Wires from a Chlorozincate Ionic Liquid by Using Pulse Potential Electrodeposition

“…Alternatively, the diameter modulated nanowires could be obtained by deposition into pre-made AAO templates with periodically modulated pore diameter along the pore axis. [19][20][21][22] While template-assisted methods have been widely practiced for the preparation of nanowires, the preparation of the suitable porous templates could be time and cost consuming, particularly the diametermodulated AAO templates is much more complex to prepare than the AAO with straight channels. One the other hand, template-free methods 23,24 may offer the advantage of time and material saving because they do not need the preparation and removal of the templates.…”