A novel electron spin-polarization detector with very large analyzing power

Abstract

Articles you may be interested inHigh-efficiency spin-resolved and spin-integrated electron detection: Parallel mounting on a hemispherical analyzer Rev. Sci. Instrum. 70, 4225 (1999); 10.1063/1.1150056 Two-dimensional toroidal electron analyzer for energy and angular dispersive measurements Rev.A new compact 60 kV Mott polarimeter for spin polarized electron spectroscopy Rev.The low energy electron reflectivity from a magnetic surface depends on the relative orientation between the electron spin and the sample magnetization. This effect has been exploited for realizing a new electron spin polarization detector. As a scattering surface we have used a well ordered Fe(001)-p(1ϫ1)O surface, which is stable against surface contamination and gives rise to very large spin dependent effects. We describe in detail the preparation in vacuum of such a target surface and show that it can be transferred in a separate system, without performance losses. The analyzing power S of the detector is given by the relative variation of its response when the target magnetization is reversed. We find extremely large S values for electrons reflected at 3-6 eV kinetic energy, with maximum above 45%, i.e., roughly 3 times better than other polarimeters presently used.

Determination of surface and interface magnetic properties for the multiferroic heterostructure Co/BaTiO3using spleed and arpes

“…This result is related to the coupling of incident electrons to bands which disperses perpendicular to the Co(001) surface. Depending on the band dispersion along the normal vector of the (001)-plane and the kinetic energy of the incident electron a coupling is possible or not [29]. Without coupling a large reflectivity results, with vanishing coupling the intensity of the reflected electrons decreases.…”

A New Spin on Photoemission Spectroscopy

“…Following the analysis of Bertacco et. al.,169 this sort of instrumental asymmetry in an exchange based polarimeter can be introduced into the previous section's analysis by modifying equation 5.46 to…”

“…Work can always continue to develop better scattering targets, both by analyzing effective Sherman functions and FOMs with the SPLEEM and by adapting the preparation recipes in the polarimeter's prep chamber. One specific area which could likely be im-proved with further investigation is target stability; surface oxidation 171,169 and graphene overlayers 192,193 are particularly intriguing possibilities.…”

Comment on “High efficiency electron spin polarization analyzer based on exchange scattering at Fe/W(001)” [Rev. Sci. Instrum. 79, 083303 (2008)]

“…Note that this does not have any effect when measuring asymmetry but influences the result of the calculation of the figure of merit. Therefore, with this experimental setup only qualitative comparisons with other spin detectors 3,4 and spin detection techniques 8,9 can be made.…”

“…In Fig Furthermore, at this state of the experimental setup, one has to assume values for P from other experiments to derive the figure of merit and therefore a rigorous comparison with other detectors 3,4 in which polarization-calibrated electron sources were used, 5-7 cannot be made. Also the uncertainty of I / I 0 in the calculation of the figure of merit makes difficult a quantitative comparison with other detectors.…”