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Sökning: WFRF:(Arai Shigeo)

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1.
  • Muto, Shunsuke, et al. (författare)
  • Quantitative characterization of nanoscale polycrystalline magnets with electron magnetic circular dichroism
  • 2014
  • Ingår i: Nature Communications. - : Springer Science and Business Media LLC. - 2041-1723. ; 5, s. 3138-
  • Tidskriftsartikel (refereegranskat)abstract
    • Electron magnetic circular dichroism (EMCD) allows the quantitative, element-selective determination of spin and orbital magnetic moments, similar to its well-established X-ray counterpart, X-ray magnetic circular dichroism (XMCD). As an advantage over XMCD, EMCD measurements are made using transmission electron microscopes, which are routinely operated at sub-nanometre resolution, thereby potentially allowing nanometre magnetic characterization. However, because of the low intensity of the EMCD signal, it has not yet been possible to obtain quantitative information from EMCD signals at the nanoscale. Here we demonstrate a new approach to EMCD measurements that considerably enhances the outreach of the technique. The statistical analysis introduced here yields robust quantitative EMCD signals. Moreover, we demonstrate that quantitative magnetic information can be routinely obtained using electron beams of only a few nanometres in diameter without imposing any restriction regarding the crystalline order of the specimen.
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2.
  • Tatsumi, Kazuyoshi, et al. (författare)
  • Signal enhancement of electron magnetic circular dichroism by ultra-high-voltage TEM, toward quantitative nano-magnetism measurements
  • 2014
  • Ingår i: Journal of Electron Microscopy. - : Oxford University Press (OUP). - 0022-0744 .- 1477-9986. ; 63:3, s. 243-247
  • Tidskriftsartikel (refereegranskat)abstract
    • Electron magnetic circular dichroism (EMCD) has been known as the transmission electron microscopy (TEM) counterpart of X-ray magnetic circular dichroism (XMCD). XMCD is already widely used for the characterization of magnetic materials with synchrotron radiation. There have been common difficulties encountered in quantitative analysis of the EMCD signal measured by medium-voltage TEMs, such as a small signal fraction and the low signal-to-noise ratio of the EMCD signal. Theoretical calculations of EMCD considering many-beam dynamical diffraction effects showed improved net magnetic signal fractions at an accelerating voltage of 1 MV compared with 200 kV, which is in agreement with the present experiment.
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  • Resultat 1-2 av 2
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tidskriftsartikel (2)
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refereegranskat (2)
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Rusz, Jan (2)
Tatsumi, Kazuyoshi (2)
Muto, Shunsuke (2)
Arai, Shigeo (2)
Oppeneer, Peter M. (1)
Buergler, Daniel E. (1)
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Adam, Roman (1)
Schneider, Claus M. (1)
Kocevski, Vancho (1)
Kudo, Tomohiro (1)
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Uppsala universitet (2)
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Engelska (2)
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2014 (2)

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