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Title: Effect of boron addition on the structure and magnetic properties of CoPt nanoparticles

Abstract

The effect of B addition on CoPt nanoparticles was investigated. The CoPt-B nanoparticles were synthesized by means of the polyol process. Transmission electron microscopy has shown that the as-synthesized particles have a spherical morphology with average size about 2–3 nm. The X-ray absorption spectroscopy and the X-ray diffraction technique showed the effect of B concentration on phase transformation. The addition of B at up to 60% promoted the formation of the L1{sub 0} phase when the nanoparticles were subjected to annealing at 600 °C. If the B content is higher than 60%, the phase transition is suppressed. The evidence of B addition on the structure of CoPt nanoparticles was further supported by the magnetic measurements. The results show that the coercivity of the annealed CoPt-B nanoparticles was enhanced by the B additions from 20% to 60%, with the maximum coercivity of 12 000 Oe for the CoPt-40%B sample.

Authors:
 [1]; ;  [2];  [3];  [3]
  1. Materials Science and Nanotechnology Program, Faculty of Science, Khon Kaen University, Khon Kaen 40002 (Thailand)
  2. Department of Physics, Faculty of Science, Khon Kaen University, Khon Kaen 40002 (Thailand)
  3. (Thailand)
Publication Date:
OSTI Identifier:
22410086
Resource Type:
Journal Article
Journal Name:
Journal of Applied Physics
Additional Journal Information:
Journal Volume: 117; Journal Issue: 17; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0021-8979
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 77 NANOSCIENCE AND NANOTECHNOLOGY; ABSORPTION SPECTROSCOPY; ANNEALING; BORON ADDITIONS; COBALT ALLOYS; COERCIVE FORCE; CONCENTRATION RATIO; MAGNETIC PROPERTIES; MORPHOLOGY; NANOPARTICLES; PHASE TRANSFORMATIONS; PLATINUM ALLOYS; TRANSMISSION ELECTRON MICROSCOPY; X-RAY DIFFRACTION; X-RAY SPECTROSCOPY

Citation Formats

Khemjeen, Yutthaya, Pinitsoontorn, Supree, E-mail: psupree@kku.ac.th, Chompoosor, Apiwat, Integrated Nanotechnology Research Center, Khon Kaen University, Khon Kaen 40002, and Nanotec-KKU Center of Excellence on Advanced Nanomaterials for Energy Production and Storage, Khon Kaen University, Khon Kaen 40002. Effect of boron addition on the structure and magnetic properties of CoPt nanoparticles. United States: N. p., 2015. Web. doi:10.1063/1.4917331.
Khemjeen, Yutthaya, Pinitsoontorn, Supree, E-mail: psupree@kku.ac.th, Chompoosor, Apiwat, Integrated Nanotechnology Research Center, Khon Kaen University, Khon Kaen 40002, & Nanotec-KKU Center of Excellence on Advanced Nanomaterials for Energy Production and Storage, Khon Kaen University, Khon Kaen 40002. Effect of boron addition on the structure and magnetic properties of CoPt nanoparticles. United States. doi:10.1063/1.4917331.
Khemjeen, Yutthaya, Pinitsoontorn, Supree, E-mail: psupree@kku.ac.th, Chompoosor, Apiwat, Integrated Nanotechnology Research Center, Khon Kaen University, Khon Kaen 40002, and Nanotec-KKU Center of Excellence on Advanced Nanomaterials for Energy Production and Storage, Khon Kaen University, Khon Kaen 40002. Thu . "Effect of boron addition on the structure and magnetic properties of CoPt nanoparticles". United States. doi:10.1063/1.4917331.
@article{osti_22410086,
title = {Effect of boron addition on the structure and magnetic properties of CoPt nanoparticles},
author = {Khemjeen, Yutthaya and Pinitsoontorn, Supree, E-mail: psupree@kku.ac.th and Chompoosor, Apiwat and Integrated Nanotechnology Research Center, Khon Kaen University, Khon Kaen 40002 and Nanotec-KKU Center of Excellence on Advanced Nanomaterials for Energy Production and Storage, Khon Kaen University, Khon Kaen 40002},
abstractNote = {The effect of B addition on CoPt nanoparticles was investigated. The CoPt-B nanoparticles were synthesized by means of the polyol process. Transmission electron microscopy has shown that the as-synthesized particles have a spherical morphology with average size about 2–3 nm. The X-ray absorption spectroscopy and the X-ray diffraction technique showed the effect of B concentration on phase transformation. The addition of B at up to 60% promoted the formation of the L1{sub 0} phase when the nanoparticles were subjected to annealing at 600 °C. If the B content is higher than 60%, the phase transition is suppressed. The evidence of B addition on the structure of CoPt nanoparticles was further supported by the magnetic measurements. The results show that the coercivity of the annealed CoPt-B nanoparticles was enhanced by the B additions from 20% to 60%, with the maximum coercivity of 12 000 Oe for the CoPt-40%B sample.},
doi = {10.1063/1.4917331},
journal = {Journal of Applied Physics},
issn = {0021-8979},
number = 17,
volume = 117,
place = {United States},
year = {2015},
month = {5}
}