Effects of Fe2+ substitution on magnetic and dielectric properties of CdCr2S4

doi:10.1088/1674-1056/20/9/097503

中国物理B ›› 2011, Vol. 20 ›› Issue (9): 97503-097503.doi: 10.1088/1674-1056/20/9/097503

Effects of Fe²⁺ substitution on magnetic and dielectric properties of CdCr₂S₄

沈俊¹, 闫丽琴², 孙阳², 何伦华², 王芳卫²

(1)Key Laboratory of Cryogenics, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China; (2)State Key Laboratory of Magnetism, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China

收稿日期:2011-03-18 修回日期:2011-04-19 出版日期:2011-09-15 发布日期:2011-09-15

Effects of Fe²⁺ substitution on magnetic and dielectric properties of CdCr₂S₄

Yan Li-Qin(闫丽琴)^a)†, Sun Yang(孙阳)^a), He Lun-Hua(何伦华)^a), Wang Fang-Wei(王芳卫)^a), and Shen Jun(沈俊)^b)

^a State Key Laboratory of Magnetism, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China; ^b Key Laboratory of Cryogenics, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China

Received:2011-03-18 Revised:2011-04-19 Online:2011-09-15 Published:2011-09-15

摘要/Abstract

摘要： The magnetic and dielectric properties of polycrystalline Cd_{1 - x}Fe_xCr₂S₄ (0 ≤ x ≤ 0.9) are investigated. Upon substitution of Cd by Fe, the Curie temperature (T_C) is increased while the saturation magnetization is decreased. A low doping level of Fe increases the permittivity, while a high doping level decreases the permittivity, which is explained by the internal barrier layer capacitor model. Kinks are observed in the temperature-dependent permittivity and loss tangent near T_C for the samples with x= 0.5, 0.7, 0.9, implying the existence of the magnetodielectric effect. Furthermore, with the increase of Fe content, a decrease of anomaly deviation rate induced by internal molecular field is revealed in the permittivity, while an increase is observed for the loss tangent.

关键词: Cd_{1 - x}Fe_xCr₂S₄, solid state reaction, magnetism, permittivity

Abstract: The magnetic and dielectric properties of polycrystalline Cd_{1 - x}Fe_xCr₂S₄ (0 ≤ x ≤ 0.9) are investigated. Upon substitution of Cd by Fe, the Curie temperature (T_C) is increased while the saturation magnetization is decreased. A low doping level of Fe increases the permittivity, while a high doping level decreases the permittivity, which is explained by the internal barrier layer capacitor model. Kinks are observed in the temperature-dependent permittivity and loss tangent near T_C for the samples with x= 0.5, 0.7, 0.9, implying the existence of the magnetodielectric effect. Furthermore, with the increase of Fe content, a decrease of anomaly deviation rate induced by internal molecular field is revealed in the permittivity, while an increase is observed for the loss tangent.

Key words: Cd_1-xFe_xCr₂S₄, solid state reaction, magnetism, permittivity

中图分类号: (Magnetomechanical effects, magnetostriction)

75.80.+q

77.84.-s (Dielectric, piezoelectric, ferroelectric, and antiferroelectric materials) 75.50.Gg (Ferrimagnetics) 75.30.-m (Intrinsic properties of magnetically ordered materials)

闫丽琴, 孙阳, 何伦华, 王芳卫, 沈俊. Effects of Fe²⁺ substitution on magnetic and dielectric properties of CdCr₂S₄[J]. 中国物理B, 2011, 20(9): 97503-097503.

Yan Li-Qin(闫丽琴), Sun Yang(孙阳), He Lun-Hua(何伦华), Wang Fang-Wei(王芳卫), and Shen Jun(沈俊) . Effects of Fe²⁺ substitution on magnetic and dielectric properties of CdCr₂S₄[J]. Chin. Phys. B, 2011, 20(9): 97503-097503.

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Effects of Fe²⁺ substitution on magnetic and dielectric properties of CdCr₂S₄

Effects of Fe²⁺ substitution on magnetic and dielectric properties of CdCr₂S₄

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