Effect of annealing on magnetic properties of Ni80Fe 20 permalloy nanoparticles with various sizes prepared by polyol method

G. W. Qin, W. L. Pei, Y. P. Ren, Y. Shimada, Yasushi Endo, Masahiro Yamaguchi, Satoshi Okamoto, Osamu Kitakami

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Ni80Fe20 permalloy nanoparticles (NPs) with narrow size distribution and homogeneous composition have been prepared by the polyol processing at 180 °C for 2h and their particle sizes can be tunable in the size range of 20-440 nm by proper addition of K2PtCl4 agent. X-ray diffraction results show that the NiFe NPs are of face centered cubic (FCC) structure. The addition of K2PtCl4 does not affect the composition of NiFe NPs but decreases the particle size remarkably. Both saturation magnetization and coercivity of the as-prepared NiFe NPs decrease with decreasing particle size. Annealed at 280 °C, however, the saturation magnetization of various size NiFe nanoparticles increases drastically and approaches to the bulk for the ∼440nm NiFe particles, however, a maximum coercivity (∼270 Oe) happens at a critical size of ∼50 nm. The magnetic property dependency of these NiFe NPs on annealing has been discussed by considering the surface chemistry.

Original languageEnglish
Title of host publicationINEC 2010 - 2010 3rd International Nanoelectronics Conference, Proceedings
Pages1116-1117
Number of pages2
DOIs
Publication statusPublished - 2010 May 5
Event2010 3rd International Nanoelectronics Conference, INEC 2010 - Hongkong, China
Duration: 2010 Jan 32010 Jan 8

Publication series

NameINEC 2010 - 2010 3rd International Nanoelectronics Conference, Proceedings

Other

Other2010 3rd International Nanoelectronics Conference, INEC 2010
CountryChina
CityHongkong
Period10/1/310/1/8

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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