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

Citation
R. Bertacco et al., A novel electron spin-polarization detector with very large analyzing power, REV SCI INS, 70(9), 1999, pp. 3572-3576
Citations number
31
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Spectroscopy /Instrumentation/Analytical Sciences","Instrumentation & Measurement
Journal title
REVIEW OF SCIENTIFIC INSTRUMENTS
ISSN journal
0034-6748 → ACNP
Volume
70
Issue
9
Year of publication
1999
Pages
3572 - 3576
Database
ISI
SICI code
0034-6748(199909)70:9<3572:ANESDW>2.0.ZU;2-P
Abstract
The low energy electron reflectivity from a magnetic surface depends on the relative orientation between the electron spin and the sample magnetizatio n. This effect has been exploited for realizing a new electron spin polariz ation detector. As a scattering surface we have used a well ordered Fe(001) -p(1x1)O surface, which is stable against surface contamination and gives r ise to very large spin dependent effects. We describe in detail the prepara tion 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 t arget magnetization is reversed. We find extremely large S values for elect rons reflected at 3-6 eV kinetic energy, with maximum above 45%, i.e., roug hly 3 times better than other polarimeters presently used. (C) 1999 America n Institute of Physics. [S0034-6748(99)02109-7].