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Volume 15, Issue 4
Displaying 1-3 of 3 articles from this issue
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Papers
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J. M. D. Coey, Y. Otani, Hong Sun, D. P. F. Hurley1991 Volume 15 Issue 4 Pages 769-772
Published: August 31, 1991
Released on J-STAGE: January 11, 2013
JOURNAL OPEN ACCESSNew interstitial compounds Sm(Fe11Ti)X1-δ (X =N; δ=0.8 and X=C; δ=0.7) have been made by heating a fine powder of Sm(Fe11Ti) in nitrogen or butane, respectively. In the nitride, there is a 3% increase in unit cell volume, approximately 10% increase in the iron moment (estimated from 57Fe Mössbauer spectra) and a 185 K increase in the Curie temperature to 769 K. The uniaxial anisotropy is destroyed, however and A20≫10Ka0-2 in the nitride. These effects are compared with those in R2Fe17 nitrides or carbides and the differences are explained qualitatively in terms of Coehoorn's model considering the configuration of interstitial atoms around thd rare earth.View full abstractDownload PDF (200K) -
K. Wakabayashi, T. Numata, S. Inokuchi, Y. Sakurai1991 Volume 15 Issue 4 Pages 773-778
Published: August 31, 1991
Released on J-STAGE: January 11, 2013
JOURNAL OPEN ACCESSFast contrast reversal of magnetic domain images with a photo-elastic modulator (PEM) was studied in two ways. A PEM employed with a quarter wave plate works as a polarization rotator and enables domain observation with fast contrast reversal under a pulsed light exposure. The contrast reversal can be done as fast as 10 μs. However, a PEM is driven sinusoidally, hence the domain contrast is modulated resulting in low contrast in its average. When a PEM was employed as a phase compensator with a garnet film polarization rotator, it compensated unwanted contribution of the ellipticity of a specimen and the garnet rotator dynamically. This combination provided not only fast contrast reversal but even higher contrast compared to that of a conventional method involving mechanical rotation of an analyzer. With the latter method, the domain image contrast of 0.82 was derived theoretically and that of 0.76 was obtained experimentally for do-mains of θk=0.19° and χk=0.13°, while it was 0.72 in the conventional mechanical method.View full abstractDownload PDF (1267K) -
M. Abe, H. Matsumura, T. Itoh, M. Gomi1991 Volume 15 Issue 4 Pages 779-782
Published: August 31, 1991
Released on J-STAGE: January 11, 2013
JOURNAL OPEN ACCESSFor polychromatic light having a broad spectrum width the effective Faraday rotation angle <θF> is defined operationally as <θF> = ∫θFλSλPλdλ/∫SλPλdλ・・・(1). Here θλ, Sλ, and Pλ are Faraday rotation angle, sensitivity of photodetector, and light intensity, respectively, at wavelength λ. Integration is performed over the spectrum width of the polychromatic light. By classical electromagnetic-wave theory we derived Eq. (1), to which we gave a consistent quantum description of photon image. Experiments on an FR-5 glass sample using a halogen lamp as a polychromatic-light source supported our calculations.View full abstractDownload PDF (244K)
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