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2007年05月31日

【期刊论文】Zero-Field-Cooled Magnetization and Coercivity of Itinerant Ferromagnet SrRuO3

侯登录, D. L. Hou, , E. Y. Jiang, S. W. Ren, Z. Q. Li, H. L. Bai

phys. Stat. sol. (a) 191, No. 2, 597-604 (2002),-0001,():

-1年11月30日

摘要

Itinerant ferromagnetic SrRuO3 with a Curie temperature TC 160.7 K was prepared by a conventional solid reaction method. Its zero-field-cooled (ZFC) magnetization and field-cooled (FC) magnetization were measured over a temperature interval from 5–180 K, in a sequence of applied fields up to coercivity. The major hysteresis loops were measured over a range of temperatures, which span the ordered phase. An empirical model was proposed to analyze the ZFC behaviors by means of coercivities at different temperatures. The calculated ZFC magnetization is consistent with the measured ZFC magnetization. Different ZFC magnetization behaviors were explained by using this model. The results indicate that the various ZFC behaviors originate from the comparison between the temperature dependence of FC magnetization and that of coercivity.

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2007年05月31日

【期刊论文】Magnetic anisotropy and coercivity of ultrane iron particles

侯登录, Deng-Lu Hou, Xiang-Fu Nie, He-Lie Luo

Journal of Magnetism and Magnetic Materials 188 (1998) 169-172,-0001,():

-1年11月30日

摘要

Ultrafine iron particles are characterized by X-ray diffraction (XRD) and transmission electron microscopy (TEM). Using the law of approach to saturation (LATS), effective magnetic anisotropy is obtained at different temperatures. KE increases with the decrease of temperature, and decreases with the thickening of the surface oxide layer. The temperature dependence of coercivity has been investigated.

Ultrafine iron particles, Anisotropy, Coercivity

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2007年05月31日

【期刊论文】Preisach studies on ZFC/FC magnetization behavior of sintered SrRuO3

侯登录, D.L. Hou, , E.Y. Jiang, Z.Q. Li, P. Wu, H.L. Bai, G.D. Tang, X.F. Nie

Journal of Magnetism and Magnetic Materials 256 (2003) 279-285,-0001,():

-1年11月30日

摘要

Zero-field-cooled (ZFC) magnetization, field-cooled (FC) magnetization, AC magnetic susceptibility and major hysteresis loops of sintered SrRuO3 have been measured over the range of magnetic ordering temperature. The data were analyzed within the framework of the Preisach model. The numerical simulations match the major features of ZFC/FC magnetization. The results indicate that various ZFC/FC behaviors originate from the applied field and the Barkhausen spectrum of the sample.

Zero-field-cooled (, ZFC), magnetization, Field-cooled (, FC), magnetization, Preisach model, Barkhausen instability, Ferromagnet

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2007年05月31日

【期刊论文】Zero-field-cooled and field-cooled magnetization of itinerant magnetic system Sr1-x Cax RuO3

侯登录, Deng-Lu Hou, , En-Yong Jiang, Gui-De Tang, Zhi-Qing Li, Shi-Wei Ren, Hai-Li Bai

Physics Letters A 298 (2002) 207-210,-0001,():

-1年11月30日

摘要

Zero-field-cooled (ZFC) magnetization, field-cooled (FC) magnetization and coercive fields of Sr1-x Cax RuO3, with x = 0.0, 0.2, 0.4 and 0.6, have been measured over the magnetic ordering temperature, in a sequence of applied fields. An empirical model has been proposed to analyze ZFC behaviors. The calculated ZFC magnetization is in agreement with the measured one. Different ZFC behaviors have been explained by means of the empirical model.

Zero-field-cooled (, ZFC), magnetization, Field-cooled (, FC), magnetization, Coercive field

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2007年05月31日

【期刊论文】Studies on the magnetic viscosity and the magnetic anisotropy of γ-Fe2O3 powders

侯登录, D.L. Hou, X.F. Nie, H.L. Luo

Appl. Phys. A 66, 109-114 (1998),-0001,():

-1年11月30日

摘要

Granular γ-Fe2O3 powders, acicular γ-Fe2O3, and CoFe–γ-Fe2O3 powders are prepared by different methods. Particle shapes and mean particle sizes of samples are determined by transmission electron microscopy (TEM). Magnetic parameters are measured by a vibrating sample magnetometer (VSM) at different temperatures. Effective magnetic anisotropy constants K E of granular γ-Fe2O3 powders at different temperatures are obtained by using the law of approach to saturation (LATS). KE values of acicular γ-Fe2O3 and CoFe–γ-Fe2O3 powders are measured by a magnetotorquemeter. It is found for the first time that the variation tendency of KE with temperature for granular γ-Fe2O3 is about the same as that of shape magnetic anisotropy Ksh. Fluctuation field Hf and activation volume Vf of samples are measured. A theoretical expression of Vf is derived. For granular γ-Fe2O3 powders, calculated activation volumes are consistent with experimental ones at different temperatures. But as for acicular γ-Fe2O3 powders, calculated activation volumes are larger than experimental ones. Experimental results show that magnetization reversal of granular γ-Fe2O3 at different temperatures is close to homogeneous rotation.

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    河北师范大学,河北

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