title: Imaging spin filter for electrons based on specular reflection from iridium (001).
abstract: As Stern-Gerlach type spin filters do not work with electrons, spin analysis of electron beams is accomplished by spin-dependent scattering processes based on spin-orbit or exchange interaction. Existing polarimeters are single-channel devices characterized by an inherently low ﬁgure of merit (FoM) of typically 10⁻⁴-10⁻³. This single-channel approach is not compatible with parallel imaging microscopes and also not with modern electron spectrometers that acquire a certain energy and angular interval simultaneously. We present a novel type of polarimeter that can transport a full image by making use of k-parallel conservation in low-energy electron diffraction. We studied specular reflection from Ir (001) because this spin-filter crystal provides a high analyzing power combined with a "lifetime" in UHV of a full day. One good working point is centered at 39 eV scattering energy with a broad maximum of 5 eV usable width. A second one at about 10 eV shows a narrower profile but much higher FoM. A relativistic layer-KKR SPLEED calculation shows good agreement with measurements.
authors: Johannes Gutenberg-Universität, Institut für Physik, 55099 Mainz, Germany.
authors: D
authors: D
authors: Kutnyakhov
authors: P
authors: P
authors: Lushchyk
authors: A
authors: A
authors: Fognini
authors: D
authors: D
authors: Perriard
authors: M
authors: M
authors: Kolbe
authors: K
authors: K
authors: Medjanik
authors: E
authors: E
authors: Fedchenko
authors: S A
authors: SA
authors: Nepijko
authors: H J
authors: HJ
authors: Elmers
authors: G
authors: G
authors: Salvatella
authors: C
authors: C
authors: Stieger
authors: R
authors: R
authors: Gort
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authors: T
authors: Bähler
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authors: Michlmayer
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authors: Acremann
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authors: Vaterlaus
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authors: Giebels
authors: H
authors: H
authors: Gollisch
authors: R
authors: R
authors: Feder
authors: C
authors: C
authors: Tusche
authors: A
authors: A
authors: Krasyuk
authors: J
authors: J
authors: Kirschner
authors: G
authors: G
authors: Schönhense
keywords: Hemispherical electron energy analyzer; Imaging spin filter; Ir (001); Multichannel spin detection