Dresden 2014 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 30: Experimental methods and magnetic imaging
MA 30.3: Vortrag
Mittwoch, 2. April 2014, 15:30–15:45, HSZ 403
Sherman Mapping of Fe(001)-p(1x1)O — •Christian Thiede1, Christian Langenkämper1, Kaito Shirai2, Anke B. Schmidt1, Taichi Okuda3, and Markus Donath1 — 1Physikalisches Institut, Universität Münster,Germany — 2Graduate school of Science, Hiroshima University, Japan — 3Hiroshima Synchrotron Radiation Center, Hiroshima University, Japan
Two major improvements in spin-polarimeter design have been reported recently: (i) Low-energy-electron scattering from oxygen-passivated Fe(001) surfaces, based on exchange interaction, offers long-term stability and a high figure of merit [1,2]. (ii) Specular reflection at high-Z targets, such as W(001), based on spin-orbit interaction, opens the way to multi-channel detection [3,4]. The use of nonmagnetic targets in the latter case complicates the investigation of spin effects in nonmagnetic samples, such as topological insulators.
In our work, we discuss the possibility of using a magnetic target in a display-type spin-polarization detector. We present reflectivity measurements and Sherman maps of a Fe(001)-p(1x1)O target over a wide range of scattering energies and angles. Both quantities contribute to the figure of merit which determines detector performance. Our findings show suitable working points for a new type of exchange-based multi-channel spin-detector with a figure of merit of up to 1.0 x 10−2.
[1] Winkelmann et al., Rev. Sci. Instrum. 79, 083303 (2008)
[2] Okuda et al., Rev. Sci. Instrum. 79, 123117 (2008)
[3] Kolbe et al., Phys.Rev. Lett. 107, 207601 (2011)
[4] Tusche et al., Appl. Phys. Lett. 99, 032505 (2011)