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1

Digitale Medien

Analysis of a magnetization process based on a two sublattice model (1992)

Zhang, Zhi-dong ; Zhao, Tong ; Sun, X. K. ; [weitere]

[S.l.] : American Institute of Physics (AIP)

Journal of Applied Physics 71 (1992), S. 3434-3438

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ISSN: 1089-7550

Quelle: AIP Digital Archive

Thema: Physik

Notizen: A computer simulation program, based on a two sublattice model, is performed to analyze the magnetization process of ferromagnetic materials (like, for instance, RCo5 and R2Fe14B compounds). Without using the assumption of the existence of a small canting angle between the two sublattices, as has been used in the analysis of S. Rinaldi and L. Pareti [J. Appl. Phys. 50, 7719 (1979)], the magnetization curve as well as its derivative curves are studied for the two sublattice system with high competing single-ion anisotropies. In the present work, a peak in the low field range of the second curve of magnetization is reported and the magnetic process is correspondingly discussed in terms of both the exchange energy and the anisotropy.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.350942

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2

Digitale Medien

Magnetic properties of YCo4B-based compounds : 37th Annual conference on magnetism and magnetic materials (1993)

Zhao, Z. G. ; Collocott, S. J. ; Dunlop, J. B. ; [weitere]

[S.l.] : American Institute of Physics (AIP)

Journal of Applied Physics 73 (1993), S. 5920-5922

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ISSN: 1089-7550

Quelle: AIP Digital Archive

Thema: Physik

Notizen: The magnetic properties of YCo4B-based compounds have been investigated. The Curie temperature TC of YCo4B does not change upon substitution of 20% of the Y ions by Nd or 20% of the B ions by C. TC increases significantly upon substitution of Fe for Co. The Co moment in YCo4B0.8C0.2 is nearly equal to that in YCo4B.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.353521

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3

Digitale Medien

Magnetic properties of R2Co14(B,C) compounds (R=Y, Sm) : 37th Annual conference on magnetism and magnetic materials (1993)

Zhao, Z. G. ; Wang, J. Y. ; Ge, Y. P. ; [weitere]

[S.l.] : American Institute of Physics (AIP)

Journal of Applied Physics 73 (1993), S. 5875-5877

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ISSN: 1089-7550

Quelle: AIP Digital Archive

Thema: Physik

Notizen: The magnetic properties of R2Co14B1−xCx (x=0, 0.5 and R=Y, Sm) compounds have been studied by measuring the temperature dependence of the easy- and hard-magnetization curves on magnetically aligned samples between 1.5 and 300 K for Y2Co14(B,C) and at 4.2 K for Sm2Co14(B,C). The magnetic anisotropy of Y2Co14B increases due to the substitution of C for B, whereas the saturation magnetization decreases. Between 1.5 and 300 K, the anisotropy field of Y2Co14B0.5C0.5 increases about 2 T and the Co moment decreases about 0.05μB. The anisotropy field of Sm2Co14B also increases upon C substitution and the saturation magnetization decreases slightly. The ac susceptibilities of both Sm2Co14B and Sm2Co14B0.5C0.5 exhibit anomalies that may arise from a spin reorientation within the basal plane.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.353507

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4

Digitale Medien

Magnetic properties of the Y2Fe14B0.5C0.5 compound : 35th annual conference on magnetism and magnetic materials (1991)

Zhao, Z. G. ; Sun, X. K. ; Chuang, Y. C.

[S.l.] : American Institute of Physics (AIP)

Journal of Applied Physics 69 (1991), S. 5574-5576

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ISSN: 1089-7550

Quelle: AIP Digital Archive

Thema: Physik

Notizen: Y2Fe14B0.5C0.5 has the same tetragonal structure as Y2Fe14B with space group P42/mnm. Magnetic properties of the Y2Fe14B0.5C0.5 compound have been studied using an extraction magnetometer with a maximum field of 6 T, in the temperature range from 1.5 to 300 K. By means of fitting the hard magnetization curves, the magnetocrystalline anisotropy constants K1, K2, and K3 were determined. It was found that although the magnetocrystalline anisotropy field (μ0Ha) increases abnormally with increasing temperature as in the case of Y2Fe14B, the dependence of anisotropy constants on temperature is quite different from that of Y2Fe14B. K1 and K3 decrease slightly with increasing temperature. K2 increases abnormally with increasing temperature, which contributes to the abnormal dependence of anisotropy field on temperature. In addition, the substitution of carbon for boron leads to a reduction of 3d-3d interaction and spontaneous magnetization. In contrast, uniaxial anisotropy is increased by the addition of carbon below room temperature.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.347954

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5

Digitale Medien

Interactions of surface plasmons with surface acoustic waves and the study of the properties of Ag films (1991)

Sun, X. ; Shiokawa, S. ; Matsui, Y.

[S.l.] : American Institute of Physics (AIP)

Journal of Applied Physics 69 (1991), S. 362-366

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ISSN: 1089-7550

Quelle: AIP Digital Archive

Thema: Physik

Notizen: Experimental and theoretical studies on the interactions of surface plasmons with surface acoustic waves have been carried out. Surface acoustic waves were generated on the hypotenuse face of a LiNbO3 prism at f0=85 MHz and 3f0=255 MHz, respectively, which acted as "dynamic'' gratings for the conversion of incident light into surface plasmons. The experiment results demonstrated excellent agreement with theoretical calculations based on Fresnel's formulas for a layered structure and the theory for light diffraction in association with surface acoustic waves. Furthermore, interesting changes in the interaction spectra were observed that have been related to the Ag film's oxidization. From these observations, variations in Ag film properties have been evaluated.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.347722

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6

Digitale Medien

First order magnetization process in (Nd,Pr)2Co14B compounds : 35th annual conference on magnetism and magnetic materials (1991)

Sun, X. K. ; Zhao, Zhi-gang ; Wang, Qun ; [weitere]

[S.l.] : American Institute of Physics (AIP)

Journal of Applied Physics 69 (1991), S. 5548-5550

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ISSN: 1089-7550

Quelle: AIP Digital Archive

Thema: Physik

Notizen: High-field magnetization behavior of (Nd,Pr)2Co14B compounds at T=4.2 K has been studied through applying high fields up to 35 T. Taking the misalignment of grains in the samples into account, the anisotropy constants K1, K2, and K3 were determined by means of fitting the hard magnetization curves. Within the framework of the theory developed by Asti and Bolzoni, FOMP phenomena are predicted to occur in the whole system (0〈x〈1). Accompanying the transformation from easy cone (x=0) to easy axis (x(approximately-greater-than)0.2), the type of FOMP changes from P1C to P1. The critical field of the FOMP transition increases with increasing Pr content. Magnetic measurements show that a valence instability of the Pr ion may exist.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.347946

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