Sol-gel synthesis and magnetization study of Mn1-xCu xFe2O4 (x = 0, 0.2) nanocrystallites

Jian Jun Li; Wei Xu; Hong Ming Yuan; Jie Sheng Chen

doi:10.1016/j.ssc.2004.06.014

Sol-gel synthesis and magnetization study of Mn_1-xCu _xFe₂O₄ (x = 0, 0.2) nanocrystallites

Jian Jun Li
, Wei Xu
, Hong Ming Yuan
, Jie Sheng Chen^*

^*Corresponding author for this work

College of Chemistry

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

23 Scopus citations

Abstract

The magnetic nanoparticles of Mn_1-xCu_xFe ₂O₄(x = 0, 0.2) were prepared by using a sol-gel method. It is proved that both the MnFe₂O₄ and Mn _0.8Cu_0.2Fe₂O₄ nanoparticle samples have superparamagnetic feature. Although the particle sizes are the same, substitution of a small fraction Cu for Mn results in the increase of magnetocrystallite anisotropy energy, thus enhances the blocking temperature from 130 K for MnFe₂O₄ to 260 K for Mn _0.8Cu_0.2Fe₂O₄. Mössbauer spectroscopy confirms that the anisotropy constant K of the Mn _0.8Cu_0.2Fe₂O₄ material is distinctly higher than that of the MnFe₂O₄ compound. Increase of the blocking temperature suggests that the approach we employed is effective to tackle the 'superparamagnetic limit' problem.

Original language	English
Pages (from-to)	519-522
Number of pages	4
Journal	Solid State Communications
Volume	131
Issue number	8
DOIs	https://doi.org/10.1016/j.ssc.2004.06.014
State	Published - 1 Aug 2004
Externally published	Yes

Keywords

A. Magnetic nanoparticles
B. Superparamagnetic limit
C. Anisotropy constant

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10.1016/j.ssc.2004.06.014

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title = "Sol-gel synthesis and magnetization study of Mn1-xCu xFe2O4 (x = 0, 0.2) nanocrystallites",

abstract = "The magnetic nanoparticles of Mn1-xCuxFe 2O4(x = 0, 0.2) were prepared by using a sol-gel method. It is proved that both the MnFe2O4 and Mn 0.8Cu0.2Fe2O4 nanoparticle samples have superparamagnetic feature. Although the particle sizes are the same, substitution of a small fraction Cu for Mn results in the increase of magnetocrystallite anisotropy energy, thus enhances the blocking temperature from 130 K for MnFe2O4 to 260 K for Mn 0.8Cu0.2Fe2O4. M{\"o}ssbauer spectroscopy confirms that the anisotropy constant K of the Mn 0.8Cu0.2Fe2O4 material is distinctly higher than that of the MnFe2O4 compound. Increase of the blocking temperature suggests that the approach we employed is effective to tackle the 'superparamagnetic limit' problem.",

keywords = "A. Magnetic nanoparticles, B. Superparamagnetic limit, C. Anisotropy constant",

author = "Li, \{Jian Jun\} and Wei Xu and Yuan, \{Hong Ming\} and Chen, \{Jie Sheng\}",

year = "2004",

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doi = "10.1016/j.ssc.2004.06.014",

language = "英语",

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T1 - Sol-gel synthesis and magnetization study of Mn1-xCu xFe2O4 (x = 0, 0.2) nanocrystallites

AU - Li, Jian Jun

AU - Xu, Wei

AU - Yuan, Hong Ming

AU - Chen, Jie Sheng

PY - 2004/8/1

Y1 - 2004/8/1

N2 - The magnetic nanoparticles of Mn1-xCuxFe 2O4(x = 0, 0.2) were prepared by using a sol-gel method. It is proved that both the MnFe2O4 and Mn 0.8Cu0.2Fe2O4 nanoparticle samples have superparamagnetic feature. Although the particle sizes are the same, substitution of a small fraction Cu for Mn results in the increase of magnetocrystallite anisotropy energy, thus enhances the blocking temperature from 130 K for MnFe2O4 to 260 K for Mn 0.8Cu0.2Fe2O4. Mössbauer spectroscopy confirms that the anisotropy constant K of the Mn 0.8Cu0.2Fe2O4 material is distinctly higher than that of the MnFe2O4 compound. Increase of the blocking temperature suggests that the approach we employed is effective to tackle the 'superparamagnetic limit' problem.

AB - The magnetic nanoparticles of Mn1-xCuxFe 2O4(x = 0, 0.2) were prepared by using a sol-gel method. It is proved that both the MnFe2O4 and Mn 0.8Cu0.2Fe2O4 nanoparticle samples have superparamagnetic feature. Although the particle sizes are the same, substitution of a small fraction Cu for Mn results in the increase of magnetocrystallite anisotropy energy, thus enhances the blocking temperature from 130 K for MnFe2O4 to 260 K for Mn 0.8Cu0.2Fe2O4. Mössbauer spectroscopy confirms that the anisotropy constant K of the Mn 0.8Cu0.2Fe2O4 material is distinctly higher than that of the MnFe2O4 compound. Increase of the blocking temperature suggests that the approach we employed is effective to tackle the 'superparamagnetic limit' problem.

KW - A. Magnetic nanoparticles

KW - B. Superparamagnetic limit

KW - C. Anisotropy constant

UR - https://www.scopus.com/pages/publications/3242719613

U2 - 10.1016/j.ssc.2004.06.014

DO - 10.1016/j.ssc.2004.06.014

M3 - 文章

AN - SCOPUS:3242719613

SN - 0038-1098

VL - 131

SP - 519

EP - 522

JO - Solid State Communications

JF - Solid State Communications

IS - 8

ER -

Sol-gel synthesis and magnetization study of Mn_1-xCu _xFe₂O₄ (x = 0, 0.2) nanocrystallites

Abstract

Keywords

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