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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】Magnetic entropy change in La0.67-x Ca0.33MnO3

侯登录, D.L. Hou, Y. Bai, J. Xu, G.D. Tang, X.F. Nie

Journal of Alloys and Compounds 384 (2004) 62-66,-0001,():

-1年11月30日

摘要

Polycrystalline samples of La0.67-x Ca0.33 MnO3 (x = 0.00, 0.02, 0.06, and 0.10) with different La site vacancies have been prepared by the sol–gel method. The grain sizes of the samples are observed by SEM. XRD results show that the samples are single phase of perovskite-type oxides. The Curie temperatures and the magnetic entropy changes of the samples are measured on a vibrating sample magnetometer (VSM). The influence of the vacancy concentration in the La site on their magnetocaloric properties has been investigated. A large magnetic entropy change (~2.78 J/kg K) is obtained in the sample La0.67-x Ca0.33 MnO3 (x = 0.02) at its Curie temperature (277 K) in an applied magnetic field of 1 T. Results of magnetic measurement show that these materials with La site vacancies can be used as candidates for magnetic refrigerants near room temperature.

Perovskite-type manganese oxides, Magnetic refrigerant, Magnetocaloric effect, Magnetic entropy change

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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】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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    河北师范大学,河北

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