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Digitale Medien

Structural parameter determination in fluorescence EXAFS of concentrated samples (1989)

Tan, Zhengquan ; Budnick, Joseph I. ; Heald, Steve M.

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

Review of Scientific Instruments 60 (1989), S. 1021-1025

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ISSN: 1089-7623

Quelle: AIP Digital Archive

Thema: Physik , Elektrotechnik, Elektronik, Nachrichtentechnik

Notizen: Fluorescence detection is often used to obtain the extended x-ray absorption fine structure (EXAFS) of dilute samples and thin films. As the samples become concentrated and the films become thick, significant errors can be introduced in the EXAFS amplitudes. With detailed calculations we determine the reduction in the coordination numbers (N) and the deviation in the mean-squared relative displacements (σ2) as determined by fluorescence detection. Experimental results on Cu, Ni, Fe, and Nb samples support the predictions of the calculation. We suggest corrections to obtain the correct coordination numbers and σ2 values for studies of concentrated samples by fluorescence EXAFS detection when other methods are not feasible.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.1140311

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Digitale Medien

Low field magnetic anisotropy in Metglas 2605 CO ribbons (1985)

Hayes, Guy H. ; Hines, William A. ; Yang, De Ping ; [weitere]

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

Journal of Applied Physics 57 (1985), S. 3511-3513

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ISSN: 1089-7550

Quelle: AIP Digital Archive

Thema: Physik

Notizen: In order to investigate the magnetic anisotropy, low field magnetization measurements have been carried out on various samples of magnetically annealed Metglas 2605 CO. The as-fabricated material exhibits a magnetic anisotropy with the easy axis along the ribbon length. By using the magnetic annealing treatment which yields an enhanced value for the magnetomechanical coupling factor, a magnetic anisotropy is induced with the easy axis in the plane of the ribbon and perpendicular to the length. A value of K=4.3×103 erg/cm3 is calculated for the induced anisotropy energy constant at room temperature. Using a model based on simple domain rotation, a value of λs=25×10−6 is estimated for the corresponding saturation magnetostriction. The anisotropy increases 37% when the temperature is reduced to 77 °K. Values are presented for the saturation magnetization, domain magnetization, coercive field, and initial permeability.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.335044

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