Magnetic imaging with soft x-ray spectroholography

被引:33
作者
Hellwig, O
Eisebitt, S
Eberhardt, W
Schlotter, WF
Lüning, J
Stöhr, J
机构
[1] BESSY GmbH, D-12489 Berlin, Germany
[2] Hitachi Global Storage Technol, San Jose Res Ctr, San Jose, CA 95120 USA
[3] Stanford Linear Accelerator Ctr, SSRL, Menlo Pk, CA 94025 USA
[4] Stanford Univ, Dept Appl Phys, Stanford, CA 94305 USA
关键词
D O I
10.1063/1.2165925
中图分类号
O59 [应用物理学];
学科分类号
摘要
We present recent advances in imaging magnetic nanostructures via lensless holographic x-ray techniques. In addition to the tunable energy and polarization this method also uses the coherent photon flux that is now available at third generation synchrotron radiation sources. Our spectroscopic imaging technique is based on the direct Fourier inversion of a holographically formed interference pattern, thus we refer to it as spectroholography. By exploiting the magnetic dichroism in resonance at the L-3 absorption edges of the magnetic transition metals (wavelength of similar to 1-2 nm and energy of similar to 700-900 eV), images of magnetic nanostructures have been obtained with a spatial resolution below 50 nm. Using Si3N4-membrane substrates we combine in our experimental setup the sample itself rigidly with the holographic mask structure consisting of an 800 nm gold layer with a micronsized object aperture and a nanosized reference hole on the backside of the membrane. Such a compact implementation leaves plenty of space for installing extreme sample environments such as high magnetic fields and low temperatures that are difficult to combine with conventional x-ray imaging techniques based on focusing optics. (C) 2006 American Institute of Physics.
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