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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.


Related in: MedlinePlus

Field-dependent magnetization curves (M-H) of the Co/InP nanocomposite structure, where the magnetic field is applied perpendicular to the surface of the InP template with different deposition times of Co: (a) 30 s (square) and 90 s (solid line), (b) 5 min (square), the inset shows the magnetization curve of the n-type porous InP template (square).
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Figure 4: Field-dependent magnetization curves (M-H) of the Co/InP nanocomposite structure, where the magnetic field is applied perpendicular to the surface of the InP template with different deposition times of Co: (a) 30 s (square) and 90 s (solid line), (b) 5 min (square), the inset shows the magnetization curve of the n-type porous InP template (square).

Mentions: Figure 4 shows field-dependent magnetization (M-H) curves of such Co/InP nanocomposites, where the applied magnetic field is perpendicular to the surface of the InP template or parallel to the axis of InP channel. For the deposition time of 30 s, the Co/InP nanocomposite presents diamagnetism as shown in Figure 4a, which is ascribed to the complete diamagnetism of n-type porous InP template according to the above SEM analysis and the M-H curve of pure InP (Figure 4b). While weak ferromagnetism is detected for the sample with the deposition time of 90 s (Figure 4a), with the deposition time of 5 min, the Co/InP nanocomposite exhibits visible hysteresis loop as shown in Figure 4b. This indicates that the Co particles embedded in the InP matrix dominate the magnetic behavior of this Co/InP nanocomposite when the content of Co gradually increases due to the strong ferromagnetism of Co. In a word, the magnetism of such Co/InP magnetic semiconductor nanocomposite is completely determined by the deposition time of Co. The exhibited ferromagnetism under the room temperature, originating from the Co particles embedded in the n-type porous InP matrix, is different from that of the superparamagnetism of Co particles in Cu and dendrimer matrix [22,36].


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)

Field-dependent magnetization curves (M-H) of the Co/InP nanocomposite structure, where the magnetic field is applied perpendicular to the surface of the InP template with different deposition times of Co: (a) 30 s (square) and 90 s (solid line), (b) 5 min (square), the inset shows the magnetization curve of the n-type porous InP template (square).
© Copyright Policy - open-access
Related In: Results  -  Collection

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

Figure 4: Field-dependent magnetization curves (M-H) of the Co/InP nanocomposite structure, where the magnetic field is applied perpendicular to the surface of the InP template with different deposition times of Co: (a) 30 s (square) and 90 s (solid line), (b) 5 min (square), the inset shows the magnetization curve of the n-type porous InP template (square).
Mentions: Figure 4 shows field-dependent magnetization (M-H) curves of such Co/InP nanocomposites, where the applied magnetic field is perpendicular to the surface of the InP template or parallel to the axis of InP channel. For the deposition time of 30 s, the Co/InP nanocomposite presents diamagnetism as shown in Figure 4a, which is ascribed to the complete diamagnetism of n-type porous InP template according to the above SEM analysis and the M-H curve of pure InP (Figure 4b). While weak ferromagnetism is detected for the sample with the deposition time of 90 s (Figure 4a), with the deposition time of 5 min, the Co/InP nanocomposite exhibits visible hysteresis loop as shown in Figure 4b. This indicates that the Co particles embedded in the InP matrix dominate the magnetic behavior of this Co/InP nanocomposite when the content of Co gradually increases due to the strong ferromagnetism of Co. In a word, the magnetism of such Co/InP magnetic semiconductor nanocomposite is completely determined by the deposition time of Co. The exhibited ferromagnetism under the room temperature, originating from the Co particles embedded in the n-type porous InP matrix, is different from that of the superparamagnetism of Co particles in Cu and dendrimer matrix [22,36].

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