Spin-dependence of absorbed and reflected current on Fe(110) and a comparison with secondary electron polarization fine structure

doi:10.1016/0042-207X(90)90397-H

Vacuum

Volume 41, Issues 1–3, 1990, Pages 500-502

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Measurements of the normalized difference in the absorption and reflection of low-energy electrons with opposite spin-polarization, and the spin-polarization of low-energy secondary electrons, from Fe(110) are found to be influenced by the spin-split bulk band structure. Maxima and minima in the absorbed and reflected current asymmetries are interpreted in terms of band structure effects and are shown to be directly related to the spin-polarization fine structure in low-energy secondary electron emission from ferromagnets. The feasibility of using spin-dependent low-energy electron reflection from ferromagnets as an electron spin-polarization detector is discussed.

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Cited by (6)

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The situation is different for the case of the first maximum of asymmetry. This maximum has been reported for ultrathin layers and Fe single crystal [31,32,16,33]. Its energy position at 1.4 eV is independent on the film thickness (except for a small decrease at 2 ML), Fig. 4(a).
The magnetic properties of ultrathin ferromagnetic films are studied by means of Spin Polarized Low Energy Electron Microscopy. Measurements of the onset of ferromagnetic order, distribution and shape of magnetic domains, magnetization direction and their change are now well established standards for this technique. Here, the asymmetry parameter has been determined as a function of film coverage and energy of the incident electron beam. It reveals oscillatory behavior which is usually described as due to the quantum size effect (QSE). We explore the origin of the characteristic features observed in the asymmetry curves and distinguish between the QSE oscillations and other phenomena influencing the shape of the asymmetry curves. As an example we discuss the asymmetry of ultrathin iron films grown on the W(1 1 0) surface.
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For spin-polarized low-energy (0–50 eV) electrons incident on magnetized Fe(1 1 0) we have measured and dynamically calculated the elastic reflected current and the exchange-induced scattering asymmetry associated with it. The structure of the asymmetry is related to the spin-split band structure above the vacuum level. A large asymmetry peak around 5 eV, where the current is also large, is very stable against changes of the incidence angle and variations of the potential and the surface magnetization. This suggests a very efficient spin polarimeter.
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Absorption and elastic and inelastic reflection of spin-polarized low-energy electrons from Fe(110)
1992, Physical Review B

^*: Present address: Advanced Research Laboratory, Hitachi Ltd, Kokubunji, Tokyo 185, Japan.

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Plenary LectureSpin-dependence of absorbed and reflected current on Fe(110) and a comparison with secondary electron polarization fine structure

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Spin-dependence of absorbed and reflected current on Fe(110) and a comparison with secondary electron polarization fine structure