Anisotropic Sm-(Co,Fe) nanoparticles by surfactant-assisted ball milling

Nilay G. Akdogan; George C. Hadjipanayis; David J. Sellmyer

doi:10.1063/1.3067851

Anisotropic Sm-(Co,Fe) nanoparticles by surfactant-assisted ball milling

Nilay G. Akdogan, George C. Hadjipanayis, David J. Sellmyer

Physics and Astronomy

Research output: Contribution to journal › Article › peer-review

57 Scopus citations

Abstract

Magnetically hard Sm2 (Co0.8 Fe0.2) 17 and SmCo5 nanoparticles have been produced by using surfactant-assisted low- and high-energy ball milling techniques. Surfactants prevent the rewelding of the crashed particles during the milling process. Heptane was used as the milling medium and oleic acid as the surfactant. High-energy ball milling experiments took place in a milling vial with carbon steel balls by using an SPEX 8000M high-energy ball milling machine. The coercivity was found to increase with milling time with values of 2.3 kOe for Sm2 (Co0.8 Fe0.2) 17 and 18.6 kOe for SmCo5 after 4 h of milling. Transmission electron microscopy data showed that the milled powders consisted of nanoparticles with an average size of 5-6 nm and a narrow size distribution. Samples deposited on copper coated carbon grid showed self-assembled nanoparticles which could be further aligned when subjected to a magnetic field.

Original language	English (US)
Article number	07A710
Journal	Journal of Applied Physics
Volume	105
Issue number	7
DOIs	https://doi.org/10.1063/1.3067851
State	Published - 2009

ASJC Scopus subject areas

Physics and Astronomy(all)

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10.1063/1.3067851

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@article{62210539a086483e9d9b98da501d83a4,

title = "Anisotropic Sm-(Co,Fe) nanoparticles by surfactant-assisted ball milling",

abstract = "Magnetically hard Sm2 (Co0.8 Fe0.2) 17 and SmCo5 nanoparticles have been produced by using surfactant-assisted low- and high-energy ball milling techniques. Surfactants prevent the rewelding of the crashed particles during the milling process. Heptane was used as the milling medium and oleic acid as the surfactant. High-energy ball milling experiments took place in a milling vial with carbon steel balls by using an SPEX 8000M high-energy ball milling machine. The coercivity was found to increase with milling time with values of 2.3 kOe for Sm2 (Co0.8 Fe0.2) 17 and 18.6 kOe for SmCo5 after 4 h of milling. Transmission electron microscopy data showed that the milled powders consisted of nanoparticles with an average size of 5-6 nm and a narrow size distribution. Samples deposited on copper coated carbon grid showed self-assembled nanoparticles which could be further aligned when subjected to a magnetic field.",

author = "Akdogan, {Nilay G.} and Hadjipanayis, {George C.} and Sellmyer, {David J.}",

note = "Funding Information: The authors would like to thank A. M. Gabay for helpful discussions. This work was supported by DOE. FIG. 1. X-ray diffraction data for a Sm 2 ( Co , Fe ) 17 alloy which was homogenized (1) and milled for 1 h (2), 2 h (3), and 4 h (4) and field aligned after the 4 h milling (5). The rhombohedral 2:17 structure is indexed. FIG. 2. TEM bright field image of the 4 h milled 2:17 alloy and corresponding indexed SAED image. FIG. 3. High resolution TEM image of the 4 h milled 2:17 alloy. FIG. 4. Coercivity vs milling time graph for 1:5 and 2:17 alloys (maximum applied field was 20 kOe). FIG. 5. Hysteresis loops for the 1:5 nanoparticles (maximum applied field was 20 kOe). ",

year = "2009",

doi = "10.1063/1.3067851",

language = "English (US)",

volume = "105",

journal = "Journal of Applied Physics",

issn = "0021-8979",

publisher = "American Institute of Physics Publising LLC",

number = "7",

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T1 - Anisotropic Sm-(Co,Fe) nanoparticles by surfactant-assisted ball milling

AU - Akdogan, Nilay G.

AU - Hadjipanayis, George C.

AU - Sellmyer, David J.

N1 - Funding Information: The authors would like to thank A. M. Gabay for helpful discussions. This work was supported by DOE. FIG. 1. X-ray diffraction data for a Sm 2 ( Co , Fe ) 17 alloy which was homogenized (1) and milled for 1 h (2), 2 h (3), and 4 h (4) and field aligned after the 4 h milling (5). The rhombohedral 2:17 structure is indexed. FIG. 2. TEM bright field image of the 4 h milled 2:17 alloy and corresponding indexed SAED image. FIG. 3. High resolution TEM image of the 4 h milled 2:17 alloy. FIG. 4. Coercivity vs milling time graph for 1:5 and 2:17 alloys (maximum applied field was 20 kOe). FIG. 5. Hysteresis loops for the 1:5 nanoparticles (maximum applied field was 20 kOe).

PY - 2009

Y1 - 2009

N2 - Magnetically hard Sm2 (Co0.8 Fe0.2) 17 and SmCo5 nanoparticles have been produced by using surfactant-assisted low- and high-energy ball milling techniques. Surfactants prevent the rewelding of the crashed particles during the milling process. Heptane was used as the milling medium and oleic acid as the surfactant. High-energy ball milling experiments took place in a milling vial with carbon steel balls by using an SPEX 8000M high-energy ball milling machine. The coercivity was found to increase with milling time with values of 2.3 kOe for Sm2 (Co0.8 Fe0.2) 17 and 18.6 kOe for SmCo5 after 4 h of milling. Transmission electron microscopy data showed that the milled powders consisted of nanoparticles with an average size of 5-6 nm and a narrow size distribution. Samples deposited on copper coated carbon grid showed self-assembled nanoparticles which could be further aligned when subjected to a magnetic field.

AB - Magnetically hard Sm2 (Co0.8 Fe0.2) 17 and SmCo5 nanoparticles have been produced by using surfactant-assisted low- and high-energy ball milling techniques. Surfactants prevent the rewelding of the crashed particles during the milling process. Heptane was used as the milling medium and oleic acid as the surfactant. High-energy ball milling experiments took place in a milling vial with carbon steel balls by using an SPEX 8000M high-energy ball milling machine. The coercivity was found to increase with milling time with values of 2.3 kOe for Sm2 (Co0.8 Fe0.2) 17 and 18.6 kOe for SmCo5 after 4 h of milling. Transmission electron microscopy data showed that the milled powders consisted of nanoparticles with an average size of 5-6 nm and a narrow size distribution. Samples deposited on copper coated carbon grid showed self-assembled nanoparticles which could be further aligned when subjected to a magnetic field.

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