Effects of heat treatment and magnetoannealing on nanocrystalline Co-ferrite powders

Y. C. Wang; J. Ding; J. H. Yin; B. H. Liu; J. B. Yi; S. Yu

doi:10.1063/1.2148632

Effects of heat treatment and magnetoannealing on nanocrystalline Co-ferrite powders

Y. C. Wang, J. Ding^*, J. H. Yin, B. H. Liu, J. B. Yi, S. Yu

^*Corresponding author for this work

Research output: Contribution to journal › Review article › peer-review

31 Scopus citations

Abstract

This work consists of three parts: the effects of heat treatment (slow cooling and quenching), magnetoannealing, and postannealing of samples with induced anisotropy. It has been found that noncomplete inverse spinel structure was the result after annealing at higher temperature and quenching. Our Mössbauer spectroscopy study confirmed noncomplete inverse structure after quenching, while inverse spinel structure was formed after slow cooling. The kinetics of the formation of induced anisotropy during magnetoannealing has been investigated in this study. Reduction of crystalline magnetic anisotropy was observed, as coercivity decreased after magnetoannealing. The change of remanence ratio and coercivity followed the expected equations for ion diffusion. A relative large anisotropy in magnetization was evident. A postannealing resulted in the conversion into the initial isotropic stage. The process could be well described using the equations of ion diffusion.

Original language	English
Article number	124306
Journal	Journal of Applied Physics
Volume	98
Issue number	12
DOIs	https://doi.org/10.1063/1.2148632
State	Published - 2005
Externally published	Yes

ASJC Scopus subject areas

General Physics and Astronomy

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@article{bfd7692c5f874528af5ed2cf4cb3ed9e,

title = "Effects of heat treatment and magnetoannealing on nanocrystalline Co-ferrite powders",

abstract = "This work consists of three parts: the effects of heat treatment (slow cooling and quenching), magnetoannealing, and postannealing of samples with induced anisotropy. It has been found that noncomplete inverse spinel structure was the result after annealing at higher temperature and quenching. Our M{\"o}ssbauer spectroscopy study confirmed noncomplete inverse structure after quenching, while inverse spinel structure was formed after slow cooling. The kinetics of the formation of induced anisotropy during magnetoannealing has been investigated in this study. Reduction of crystalline magnetic anisotropy was observed, as coercivity decreased after magnetoannealing. The change of remanence ratio and coercivity followed the expected equations for ion diffusion. A relative large anisotropy in magnetization was evident. A postannealing resulted in the conversion into the initial isotropic stage. The process could be well described using the equations of ion diffusion.",

author = "Wang, \{Y. C.\} and J. Ding and Yin, \{J. H.\} and Liu, \{B. H.\} and Yi, \{J. B.\} and S. Yu",

year = "2005",

doi = "10.1063/1.2148632",

language = "English",

volume = "98",

journal = "Journal of Applied Physics",

issn = "0021-8979",

number = "12",

}

TY - JOUR

T1 - Effects of heat treatment and magnetoannealing on nanocrystalline Co-ferrite powders

AU - Wang, Y. C.

AU - Ding, J.

AU - Yin, J. H.

AU - Liu, B. H.

AU - Yi, J. B.

AU - Yu, S.

PY - 2005

Y1 - 2005

N2 - This work consists of three parts: the effects of heat treatment (slow cooling and quenching), magnetoannealing, and postannealing of samples with induced anisotropy. It has been found that noncomplete inverse spinel structure was the result after annealing at higher temperature and quenching. Our Mössbauer spectroscopy study confirmed noncomplete inverse structure after quenching, while inverse spinel structure was formed after slow cooling. The kinetics of the formation of induced anisotropy during magnetoannealing has been investigated in this study. Reduction of crystalline magnetic anisotropy was observed, as coercivity decreased after magnetoannealing. The change of remanence ratio and coercivity followed the expected equations for ion diffusion. A relative large anisotropy in magnetization was evident. A postannealing resulted in the conversion into the initial isotropic stage. The process could be well described using the equations of ion diffusion.

AB - This work consists of three parts: the effects of heat treatment (slow cooling and quenching), magnetoannealing, and postannealing of samples with induced anisotropy. It has been found that noncomplete inverse spinel structure was the result after annealing at higher temperature and quenching. Our Mössbauer spectroscopy study confirmed noncomplete inverse structure after quenching, while inverse spinel structure was formed after slow cooling. The kinetics of the formation of induced anisotropy during magnetoannealing has been investigated in this study. Reduction of crystalline magnetic anisotropy was observed, as coercivity decreased after magnetoannealing. The change of remanence ratio and coercivity followed the expected equations for ion diffusion. A relative large anisotropy in magnetization was evident. A postannealing resulted in the conversion into the initial isotropic stage. The process could be well described using the equations of ion diffusion.

UR - https://www.scopus.com/pages/publications/29744456402

U2 - 10.1063/1.2148632

DO - 10.1063/1.2148632

M3 - Review article

AN - SCOPUS:29744456402

SN - 0021-8979

VL - 98

JO - Journal of Applied Physics

JF - Journal of Applied Physics

IS - 12

M1 - 124306

ER -

Effects of heat treatment and magnetoannealing on nanocrystalline Co-ferrite powders

Abstract

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