Influence of the electrodeposition potential on the crystallographic structure and effective magnetic easy axis of cobalt nanowires

Irshad, Muhammad Imran; Mohamed, Norani Muti; Abdullah, Mohamad Zaki; Saheed, Mohamed Shuaib Mohamed; Mumtaz, Asad; Yasar, Muhammad; Yar, Asfand; Zeeshan, Muhammad; Sort, Jordi

doi:10.1039/c6ra01311b

Cited by 13 publications

(4 citation statements)

References 35 publications

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“…The reason for this is because the sites for dehydration on atomically rough planes are larger in number than smooth planes [119]. The change in phase transformation of Co NWs was seen (i.e., from hcp to fcc) by changing the deposition parameters [120,121,122], and a group of studies by Mukhtar et al [123,124,125,126,127] showed that the smaller grain size of Co favors the formation of fcc Co NWs, and larger grain size favors the formation of hcp Co NWs. Similarly, the mixture of hcp and fcc phases was observed in Co NWs, which seems to crystallize in early stage of deposition, and later with the increase in deposition time as the length of Co NWs increases, they crystallize into the hcp phase [128].…”

Section: Electrodeposition and Structure Of Multi-segmented Nws Inmentioning

confidence: 99%

Multi-Segmented Nanowires: A High Tech Bright Future

Wang

Mukhtar

et al. 2019

Materials

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In the last couple of decades, there has been a lot of progress in the synthesis methods of nano-structural materials, but still the field has a large number of puzzles to solve. Metal nanowires (NWs) and their alloys represent a sub category of the 1-D nano-materials and there is a large effort to study the microstructural, physical and chemical properties to use them for further industrial applications. Due to technical limitations of single component NWs, the hetero-structured materials gained attention recently. Among them, multi-segmented NWs are more diverse in applications, consisting of two or more segments that can perform multiple function at a time, which confer their unique properties. Recent advancement in characterization techniques has opened up new opportunities for understanding the physical properties of multi-segmented structures of 1-D nanomaterials. Since the multi-segmented NWs needs a reliable response from an external filed, numerous studies have been done on the synthesis of multi-segmented NWs to precisely control the physical properties of multi-segmented NWs. This paper highlights the electrochemical synthesis and physical properties of multi-segmented NWs, with a focus on the mechanical and magnetic properties by explaining the shape, microstructure, and composition of NWs.

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Section: Electrodeposition and Structure Of Multi-segmented Nws Inmentioning

confidence: 99%

Multi-Segmented Nanowires: A High Tech Bright Future

Wang

Mukhtar

et al. 2019

Materials

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“…Eventually, polymeric porous templates (e.g., nanoporous polycarbonate membranes) have been utilized, in cases where the use of oxide membranes was found to be not compatible with the electrolytic bath and deposition conditions [139,140]. The investigated magnetic materials comprise single metals (like Fe, Co or Ni) [11,48,51,[141][142][143][144], binary (Co-W, Co-Pt, CoNi, FeNi, etc.) [51,89,106,[144][145][146][147][148][149][150][151][152][153][154] and ternary alloys (e.g., CoNiP) [155].…”

Section: Magnetic Properties Of Nanowiresmentioning

confidence: 99%

“…In any case, the high-aspect ratio of magnetic nanowires usually causes the occurrence of shape anisotropy, making them promising candidates for recording media with perpendicular-to-plane magnetic anisotropy [48,137]. In some cases, particularly for single crystalline nanowires (e.g., Co nanowires), the magnetocrystalline axis of easy magnetization is not oriented along the nanowire axis but perpendicular to it [51,143,163,164]. The competition between shape anisotropy and magnetocrystalline anisotropy causes peculiar angular dependence of the magnetic response in this case.…”

Section: Magnetic Properties Of Nanowiresmentioning

confidence: 99%

Electrodeposition of Iron-Group Alloys into Nanostructured Oxide Membranes: Synthetic Challenges and Properties

Cesiulis

Tsytsaru

Podlaha

et al. 2018

CNANO

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Background: Quasi-one dimensional nanostructures: nanowires, nanotubes, nanorods, nanobelts/nanoribbons and complex "nanowire-nanoparticle" composites have been synthesized over the years. These nanostructures are particularly appealing due to their specific properties defined by their high aspect ratio: two dimensions are in the nanoscale range and one dimension is in the microscale. Methods:One of the well-designed approaches for the synthesis of such nanostructured materials is template-assisted fabrication combined with electrodeposition. The fabrication approaches for the growth of iron-group alloy nanostructures inside nanoporous oxide membranes by means of different electrodeposition techniques, and the resulting unique properties and potential applications of this type of materials are reviewed. Results:Arrays of nanostructures can be obtained by filling a porous oxide template that contains a large number of straight cylindrical, nano-sized diameter holes. Generalities of metals electrodeposition into nanoporous oxide membranes are discussed. Measures to minimize the nonuniformity of deposits inside pores need to be addressed to thin the barrier layer, to control hydrogen evolution and to improve mass transport inside the pores. Examples of binary and ternary iron group alloys grown inside nanoporous oxide templates are provided. Catalytic hydrogen evolution and methanol oxidation on the nanowires arrays are described. The "sample size effect" on the magnetic properties of materials and the electrodeposition of multilayered structures necessary for giant magnetoresistance (GMR) are discussed in details. Conclusion:Electrodeposition of binary and ternary iron-group alloys confirm that controlling alloy composition inside nanopores is still a challenge. composites [7] have been synthesized over the years. These nanostructures are particularly appealing due to their specific properties defined by their high aspect ratio: two dimensions are in the nanoscale range and one dimension is in the microscale. One of the well-designed approaches for the synthesis of such nanostructured materials is template-assisted fabrication combined with electrodeposition, first reported by Possin [8] in track etched mica films, and expanded upon by others with different materials and templates [2,[9][10][11][12][13][14]. However, the self-organized porous anodic aluminum oxide (AAO) membrane has become one of the most often used templates for tunable synthesis of different nanostructured materials [15,16].

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“…Magnetic properties of nanostructured materials like Co, Ni, Fe have been widely investigated [1][2][3][4][5][6][7][8][9][10][11][12][13][14]. These studies have usually indicated emergence of novel magnetic and transport properties as the dimension approaches the length scale of a few to tens of nm.…”

Section: Introductionmentioning

confidence: 99%

Evidence of magneto-structural coupling affecting magnetic anisotropy in a cobalt nano-composite

Nath

Sinha²,

Ali³

et al. 2017

J. Phys.: Condens. Matter

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By investigating temperature dependent structural and magnetic properties of cobalt (Co) embedded within nanoporous anodized alumina template, we observe changes in the easy axis of Co magnetization and an unusual increase in its saturation magnetization below a temperature T . Analysis of our M(H) data reveals that the magnetized volume of the sample increases rapidly as T falls below T. To understand these features we perform micro-magnetic simulations for a single Co-nanopillar wherein by varying its magneto-crystalline anisotropy energy we are able to show that the changes observed near T are related to the changes in the magnetic anisotropy of the nanopillar. We propose crystallographic structural distortions trigger changes in the balance between shape and magneto-crystalline anisotropy in our nanopillar. Our results suggest interplay between magnetism, structure and magnetic anisotropy in low dimensional Co-nanopillars, which can be modified with temperature of the system.

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Influence of the electrodeposition potential on the crystallographic structure and effective magnetic easy axis of cobalt nanowires

Abstract: Cobalt nanowires (NWs) have been synthesized by electrodeposition inside the pores of anodized aluminium oxide templates, at different values of applied deposition potential.

Cited by 13 publications

References 35 publications

Multi-Segmented Nanowires: A High Tech Bright Future

Multi-Segmented Nanowires: A High Tech Bright Future

Electrodeposition of Iron-Group Alloys into Nanostructured Oxide Membranes: Synthetic Challenges and Properties

Evidence of magneto-structural coupling affecting magnetic anisotropy in a cobalt nano-composite

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