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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】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】Zero-field-cooled and field-cooled magnetizations and magnetic susceptibility of itinerant ferromagnet SrRuO3

侯登录, Hou Deng-Lu, , Jiang En-Yong, Bai Hai-Li

Chinese Physics Vol. 11, No. 8, August 2002,-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 itinerant ferromagnet SrRuO3 have been measured at magnetic ordering temperatures ranging from 5 to 160 K. An empirical model is proposed to calculate the measured ZFC magnetization. The result indicates that the calculated ZFC magnetization compares well with the measured one. Based on the generalized Preisach model, both the ZFC and FC curves are reproduced by numerical simulations. The critical temperature and critical exponents are determined by measuring the ac magnetic susceptibility in different bias magnetic fields at temperatures in the vicinity of the point of phase transition.

zero-field-cooled magnetization, field-cooled magnetization, magnetic susceptibility, hysteresis loop

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2007年05月31日

【期刊论文】Critical Behaviour of Sintered SrRuO3

侯登录, HOU Deng-Lu, JIANG En-Yong, LI Feng-Wu, BAI Hai-Li, ZHOU Xue-Zhi, Henry KUNKEL, Gwyn WILLIAMS

CHIN. PHYS. LETT. Vol. 19, No. 5 (2002),-0001,():

-1年11月30日

摘要

From the measurements of the ac susceptibility of SrRuO3, we determine the critical temperature TC=159.7 ± 0.2 K and critical exponents δ = 2.50 ± 0.15 (from the critical isotherm orδ= 3.17 ± 0.20 (from magnetization versus magnetic field at Curie temperature), γ+β = 1.50±0.05 (from the temperature dependence of the internal field of the crossover line), and γ = 0.96 ± 0.05 (from the temperature dependence of the susceptibility along the same line). These exponent values are very close to those predicted by the mean field model.

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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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    河北师范大学,河北

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