title: Evaluation of sample spin-polarization from spin-polarized scanning tunneling spectroscopy experiments.
abstract: Spin-polarized scanning tunneling microscopy has produced a great amount of images presenting magnetic contrast between different magnetic domains with an unsurpassed spatial resolution but getting values like the surface polarization has proven to be a difficult task. We will discuss in detail how to extract this information for the case of manganese layers grown on Fe(001) whiskers. Mn layers adopt a body-centered-tetragonal (bct) structure when they are grown on the Fe(001) surface at room temperature. The Mn layers show an antiferromagnetic coupling between the layers. Comparing our spin-polarized scanning tunneling spectra measured with Fe-coated W tips with spin-resolved band structure calculations, we are able to find the value of the sample surface polarization. Also discussed is a method to change the tip magnetization. Finally, the magnetic structure around a screw dislocation on the surface is reviewed.
authors.affiliation: Institute for Molecules and Materials, Radboud University Nijmegen, Toernooiveld 1, 6525 ED Nijmegen, The Netherlands. toyokazu.yamada@gakushuin.ac.jp
authors.forename: T K
authors.initials: TK
authors.lastname: Yamada
authors.forename: A L
authors.initials: AL
authors.lastname: Vázquez de Parga
authors.forename: M M J
authors.initials: MM
authors.lastname: Bischoff
authors.forename: T
authors.initials: T
authors.lastname: Mizoguchi
authors.forename: H
authors.initials: H
authors.lastname: Van Kempen
mesh_terms: D007501:Iron / Q000737:chemistry*; D008280:Magnetics; D008345:Manganese / Q000737:chemistry*; D016252:Microscopy, Scanning Tunneling; D008962:Models, Theoretical; D014414:Tungsten / Q000737:chemistry
chemical_list: D008345:Manganese; D007501:Iron; D014414:Tungsten