Magnetic anisotropies in cobalt-nickel ferrites (NixCo 1-xFe2O4)

Binghai Liu; Jun Ding; Jiabao Yi; Jianhua Yin; Zhili Dong

doi:10.3938/jkps.52.1483

Magnetic anisotropies in cobalt-nickel ferrites (Ni_xCo _1-xFe₂O₄)

Binghai Liu^*, Jun Ding, Jiabao Yi, Jianhua Yin, Zhili Dong

^*Corresponding author for this work

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

16 Scopus citations

Abstract

This work presents a detailed study on the various magnetic anisotropics of Ni_xCo_1-xFe₂O₄ prepared by using a mechanochemical process. The results indicated that the magnetic anisotropy of Ni_xCo_1-xFe₂O₄ was strongly correlated with the Co⁵⁺ concentration. The Ni²⁺ substitution readily led to a decrease in the magnetocrystalline anisotropy and coercivity. While a large uniaxial anisotropy was induced in CoFe ₂O₄ by magneto-annealing, the uniaxial anisotropy decreased with the Ni concentration in Ni_xCo_1-xFe ₂O₄ and disappeared in the pure NiFe₂O ₄. A short-time mechanical milling was found to significantly increase the coercivity in Ni_xCo_1-xFe₂O ₄ samples and high coercivities of 5.1 kOe and 2.8 kOe were achieved in the CoFe₂O₄ and the Ni_0.5Co _0.5Fe₂O₄ samples respectively. The microstructure and magnetic studies indicated that the milling-induced high coercivity could be ascribed to milling-induced stress anisotropy and to the pinning effects of defects.

Original language	English
Pages (from-to)	1483-1486
Number of pages	4
Journal	Journal of the Korean Physical Society
Volume	52
Issue number	5
DOIs	https://doi.org/10.3938/jkps.52.1483
State	Published - May 2008
Externally published	Yes

Keywords

Magnetic anisotropy
Mechanical milling
Stress anisotropy

ASJC Scopus subject areas

General Physics and Astronomy

Access to Document

10.3938/jkps.52.1483

Cite this

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title = "Magnetic anisotropies in cobalt-nickel ferrites (NixCo 1-xFe2O4)",

abstract = "This work presents a detailed study on the various magnetic anisotropics of NixCo1-xFe2O4 prepared by using a mechanochemical process. The results indicated that the magnetic anisotropy of NixCo1-xFe2O4 was strongly correlated with the Co5+ concentration. The Ni2+ substitution readily led to a decrease in the magnetocrystalline anisotropy and coercivity. While a large uniaxial anisotropy was induced in CoFe 2O4 by magneto-annealing, the uniaxial anisotropy decreased with the Ni concentration in NixCo1-xFe 2O4 and disappeared in the pure NiFe2O 4. A short-time mechanical milling was found to significantly increase the coercivity in NixCo1-xFe2O 4 samples and high coercivities of 5.1 kOe and 2.8 kOe were achieved in the CoFe2O4 and the Ni0.5Co 0.5Fe2O4 samples respectively. The microstructure and magnetic studies indicated that the milling-induced high coercivity could be ascribed to milling-induced stress anisotropy and to the pinning effects of defects.",

keywords = "Magnetic anisotropy, Mechanical milling, Stress anisotropy",

author = "Binghai Liu and Jun Ding and Jiabao Yi and Jianhua Yin and Zhili Dong",

year = "2008",

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doi = "10.3938/jkps.52.1483",

language = "English",

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TY - JOUR

T1 - Magnetic anisotropies in cobalt-nickel ferrites (NixCo 1-xFe2O4)

AU - Liu, Binghai

AU - Ding, Jun

AU - Yi, Jiabao

AU - Yin, Jianhua

AU - Dong, Zhili

PY - 2008/5

Y1 - 2008/5

N2 - This work presents a detailed study on the various magnetic anisotropics of NixCo1-xFe2O4 prepared by using a mechanochemical process. The results indicated that the magnetic anisotropy of NixCo1-xFe2O4 was strongly correlated with the Co5+ concentration. The Ni2+ substitution readily led to a decrease in the magnetocrystalline anisotropy and coercivity. While a large uniaxial anisotropy was induced in CoFe 2O4 by magneto-annealing, the uniaxial anisotropy decreased with the Ni concentration in NixCo1-xFe 2O4 and disappeared in the pure NiFe2O 4. A short-time mechanical milling was found to significantly increase the coercivity in NixCo1-xFe2O 4 samples and high coercivities of 5.1 kOe and 2.8 kOe were achieved in the CoFe2O4 and the Ni0.5Co 0.5Fe2O4 samples respectively. The microstructure and magnetic studies indicated that the milling-induced high coercivity could be ascribed to milling-induced stress anisotropy and to the pinning effects of defects.

AB - This work presents a detailed study on the various magnetic anisotropics of NixCo1-xFe2O4 prepared by using a mechanochemical process. The results indicated that the magnetic anisotropy of NixCo1-xFe2O4 was strongly correlated with the Co5+ concentration. The Ni2+ substitution readily led to a decrease in the magnetocrystalline anisotropy and coercivity. While a large uniaxial anisotropy was induced in CoFe 2O4 by magneto-annealing, the uniaxial anisotropy decreased with the Ni concentration in NixCo1-xFe 2O4 and disappeared in the pure NiFe2O 4. A short-time mechanical milling was found to significantly increase the coercivity in NixCo1-xFe2O 4 samples and high coercivities of 5.1 kOe and 2.8 kOe were achieved in the CoFe2O4 and the Ni0.5Co 0.5Fe2O4 samples respectively. The microstructure and magnetic studies indicated that the milling-induced high coercivity could be ascribed to milling-induced stress anisotropy and to the pinning effects of defects.

KW - Magnetic anisotropy

KW - Mechanical milling

KW - Stress anisotropy

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DO - 10.3938/jkps.52.1483

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JO - Journal of the Korean Physical Society

JF - Journal of the Korean Physical Society

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