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MA: Magnetismus

MA 9: Magnetic Imaging

MA 9.8: Vortrag

Montag, 27. März 2006, 16:45–17:00, HSZ 401

Imaging Magnetic Nanostructures via Resonant Soft X-Ray Spectro Holography — •Olav Hellwig^1,2, Stefan Eisebitt¹, Wolfgang Eberhardt¹, Jan Luning³, William F. Schlotter^3,4, and Joachim Stohr³ — ¹BESSY GmbH, Albert Einstein Str. 15, 12489 Berlin, Germany — ²San Jose Research Center, Hitachi Global Storage Technologies, 650 Harry Road, San Jose CA 95120, USA — ³SSRL, Stanford Linear Accelerator Center, 2575 Sand Hill Road, Menlo Park CA 94025, USA — ⁴Department of Applied Physics, 316 Via Pueblo Mall, Stanford University, Stanford, CA 94305-4090, USA

I will present how to exploit the coherence and tunable polarization of soft X-ray synchrotron radiation for imaging magnetic nanostructures via holography. This new lensless imaging technique is based on the direct Fourier inversion of a holographically formed soft x-ray interference pattern [1]. Our implementation is particularly simple and is based on placing the sample behind a lithographically manufactured mask with a micron-sized sample aperture and a nano-sized reference hole. By exploiting the magnetic dichroism in resonance at the L3 edges of the magnetic transition metals (wavelength ~ 1-2 nm (700-900 eV), images of magnetic nanostructures have been obtained with a spatial resolution of 50 nm. The technique is transferable to a wide variety of specimen, appears scalable to diffraction-limited resolution (about 2 nm), and is well suited for ultra-fast single-shot imaging with future X-ray free electron laser sources. [1] S. Eisebitt, J. Luening, W. F. Schlotter, M. Loergen, O. Hellwig, W. Eberhardt and J. Stoehr, Nature, 432 (2004) 885.