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Fabrication and magnetic properties of granular Co/porous InP nanocomposite materials.

Zhou T, Cheng D, Zheng M, Ma L, Shen W - Nanoscale Res Lett (2011)

Bottom Line: Co particles had uniform distribution over pore sidewall surface of InP template, which was different from that of ceramic template and may open up new branch of fabrication of nanocomposites.The magnetism of such Co/InP nanocomposites can be gradually tuned from diamagnetism to ferromagnetism by increasing the deposition time of Co.Such Co/InP nanocomposites with adjustable magnetism may have potential applications in future in the field of spin electronics.PACS: 61.46. +w · 72.80.Tm · 81.05.Rm · 75.75. +a · 82.45.Aa.

View Article: PubMed Central - HTML - PubMed

Affiliation: Laboratory of Condensed Matter Spectroscopy and Opto-Electronic Physics, and Key Laboratory of Artificial Structures and Quantum Control (Ministry of Education), Department of Physics, Shanghai Jiao Tong University, Shanghai, 200240, People's Republic of China. mjzheng@sjtu.edu.cn.

ABSTRACT
A novel Co/InP magnetic semiconductor nanocomposite was fabricated by electrodeposition magnetic Co nanoparticles into n-type porous InP templates in ethanol solution of cobalt chloride. The content or particle size of Co particles embedded in porous InP increased with increasing deposition time. Co particles had uniform distribution over pore sidewall surface of InP template, which was different from that of ceramic template and may open up new branch of fabrication of nanocomposites. The magnetism of such Co/InP nanocomposites can be gradually tuned from diamagnetism to ferromagnetism by increasing the deposition time of Co. Magnetic anisotropy of this Co/InP nanocomposite with magnetization easy axis along the axis of InP square channel was well realized by the competition between shape anisotropy and magnetocrystalline anisotropy. Such Co/InP nanocomposites with adjustable magnetism may have potential applications in future in the field of spin electronics.PACS: 61.46. +w · 72.80.Tm · 81.05.Rm · 75.75. +a · 82.45.Aa.

No MeSH data available.


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Schematic of fabrication process of Co/InP nanocomposite structure.
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Figure 1: Schematic of fabrication process of Co/InP nanocomposite structure.

Mentions: Co/InP magnetic semiconductor nanocomposites were fabricated by one-step electrodeposition of Co particles onto n-type porous InP templates. Figure 1 shows the schematic illustration of the fabrication of Co/InP composite structure. First, the n-type porous InP template was prepared by a two-step etching method [40]. The starting material was Sn-doped InP (>1 × 1018 cm-3) wafer, which was first etched at a constant voltage of 8 V in 7.5% HCl aqueous solution for 30 s. Next, the specimen was immersed in a mixture of pure HCl and H3PO4 (HCl:H3PO4 = 1:3 v/v) for a few minutes to remove the top irregular layer to obtain n-type porous InP templates with uniform and square pore arrays. This was followed by electrochemical deposition of Co particles onto porous InP templates, performed using a three-electrode cell, employing a porous InP template as the working electrode and a graphite plate counter-electrode. The reference electrode was a saturated calomel electrode (SCE), isolated from the solution by a salt bridge. The deposition bath was 0.1 M/L CoCl2 ethanol solution, prepared by dissolving CoCl2 in ethanol. Before the deposition of Co, the porous InP template was immersed in the bath about 1 h to allow the solution completely wet the inner pore walls. The applied potential was kept at 2.0 V with respect to SCE. After the deposition of Co, the sample was cleaned by de-ionized water, dried in N2 atmosphere, and then kept in anhydrous ethanol. All the experiments were performed at room temperature.


Fabrication and magnetic properties of granular Co/porous InP nanocomposite materials.

Zhou T, Cheng D, Zheng M, Ma L, Shen W - Nanoscale Res Lett (2011)

Schematic of fabrication process of Co/InP nanocomposite structure.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3211340&req=5

Figure 1: Schematic of fabrication process of Co/InP nanocomposite structure.
Mentions: Co/InP magnetic semiconductor nanocomposites were fabricated by one-step electrodeposition of Co particles onto n-type porous InP templates. Figure 1 shows the schematic illustration of the fabrication of Co/InP composite structure. First, the n-type porous InP template was prepared by a two-step etching method [40]. The starting material was Sn-doped InP (>1 × 1018 cm-3) wafer, which was first etched at a constant voltage of 8 V in 7.5% HCl aqueous solution for 30 s. Next, the specimen was immersed in a mixture of pure HCl and H3PO4 (HCl:H3PO4 = 1:3 v/v) for a few minutes to remove the top irregular layer to obtain n-type porous InP templates with uniform and square pore arrays. This was followed by electrochemical deposition of Co particles onto porous InP templates, performed using a three-electrode cell, employing a porous InP template as the working electrode and a graphite plate counter-electrode. The reference electrode was a saturated calomel electrode (SCE), isolated from the solution by a salt bridge. The deposition bath was 0.1 M/L CoCl2 ethanol solution, prepared by dissolving CoCl2 in ethanol. Before the deposition of Co, the porous InP template was immersed in the bath about 1 h to allow the solution completely wet the inner pore walls. The applied potential was kept at 2.0 V with respect to SCE. After the deposition of Co, the sample was cleaned by de-ionized water, dried in N2 atmosphere, and then kept in anhydrous ethanol. All the experiments were performed at room temperature.

Bottom Line: Co particles had uniform distribution over pore sidewall surface of InP template, which was different from that of ceramic template and may open up new branch of fabrication of nanocomposites.The magnetism of such Co/InP nanocomposites can be gradually tuned from diamagnetism to ferromagnetism by increasing the deposition time of Co.Such Co/InP nanocomposites with adjustable magnetism may have potential applications in future in the field of spin electronics.PACS: 61.46. +w · 72.80.Tm · 81.05.Rm · 75.75. +a · 82.45.Aa.

View Article: PubMed Central - HTML - PubMed

Affiliation: Laboratory of Condensed Matter Spectroscopy and Opto-Electronic Physics, and Key Laboratory of Artificial Structures and Quantum Control (Ministry of Education), Department of Physics, Shanghai Jiao Tong University, Shanghai, 200240, People's Republic of China. mjzheng@sjtu.edu.cn.

ABSTRACT
A novel Co/InP magnetic semiconductor nanocomposite was fabricated by electrodeposition magnetic Co nanoparticles into n-type porous InP templates in ethanol solution of cobalt chloride. The content or particle size of Co particles embedded in porous InP increased with increasing deposition time. Co particles had uniform distribution over pore sidewall surface of InP template, which was different from that of ceramic template and may open up new branch of fabrication of nanocomposites. The magnetism of such Co/InP nanocomposites can be gradually tuned from diamagnetism to ferromagnetism by increasing the deposition time of Co. Magnetic anisotropy of this Co/InP nanocomposite with magnetization easy axis along the axis of InP square channel was well realized by the competition between shape anisotropy and magnetocrystalline anisotropy. Such Co/InP nanocomposites with adjustable magnetism may have potential applications in future in the field of spin electronics.PACS: 61.46. +w · 72.80.Tm · 81.05.Rm · 75.75. +a · 82.45.Aa.

No MeSH data available.


Related in: MedlinePlus