Dresden 2006 – scientific programme
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MA: Magnetismus
MA 20: Poster: Films(1-36) Transp(37-56) Ex.Bias(57-67) Spindyn(68-80) Micromag(81-95) Particle(96-109) Imag.+Surface(110-113) Spinelectr(114-122) Theory+Micromag(123-131) Spinstr+Aniso(132-142) MagMat(143-156) Meas(157,158) MolMag+Kondo(159-162) Postdead(163-)
MA 20.111: Poster
Tuesday, March 28, 2006, 15:15–19:15, P1
Design and characterization of a miniaturized spin-detector for high-resolution SEMPA — •Robert Frömter1, Christian Menk1, Hans Peter Oepen1, and Jürgen Kirschner2 — 1Institut für Angewandte Physik, Universität Hamburg, Jungiusstr. 11, 20355 Hamburg, Germany — 2Max-Planck-Institut für Mikrostrukturphysik, Weinberg 2, 06120 Halle, Germany
The potential for magnetic imaging in SEMPA (or Spin-SEM) is generally limited by the low efficiency of all applicable spin-detection schemes known today. However, the combination of the high primary beam current from a modern UHV-compatible field-emission SEM with an optimized spin detector [1], based on LEED scattering, yields a compact instrument, which allows for sub 10 nm lateral resolution at acquisition times of some ms per pixel. The physical properties of our new spin-detector are modeled, based upon the energy distribution of the spin-polarized secondary electron emission and the scattering properties at the W(100) surface, and compared with measurements from an Fe sample. Design criteria like changes of geometry (sample tilt, working distance) or the choice of primary beam energy are discussed. Recent results will be presented, together with examples for Fe-decoration, which gives access to imaging contaminated No-dqreal-lifeNo-dq samples.
[1] R. Frömter, H.P. Oepen, and J. Kirschner, Appl. Phys. A 76, 869 (2003)