Spin‐polarized Photoelectron Spectroscopy as a Probe of Magnetic Systems

Abstract

Spin‐polarized photoelectron spectroscopy has developed into a versatile tool for the study of surface and thin‐film magnetism. In this chapter, we examine the methodology of the technique and its recent application to a number of different problems. We first examine the photoemission process itself followed by a detailed review of spin‐polarization measurement techniques and the related experimental requirements. We review studies of spin‐polarized surface states, interface states, and quantum‐well states followed by studies of the technologically important oxide systems including half‐metallic transition‐metal oxides, ferromagnet/oxide interfaces and the antiferromagnetic cuprates that exhibit high T c Superconductivity. We also discuss the application of high‐resolution photoemission with spin resolving capabilities to the study of spin‐dependent self‐energizing effects.

Effects of spin-dependent quasiparticle renormalization in Fe, Co, and Ni photoemission spectra:An experimental and theoretical study

“…In the case of ferromagnetic transition metals, an extensive experimental work in this respect has been carried out over the last 30 years. [5][6][7][8][9][10][11][12][13] At present, for a detailed understanding of the manifestation of spin-dependent electronic correlations, Fe, Co, and Ni serve as prototype systems of moderately correlated 3d materials because their electronic structure in the vicinity of the Fermi level is dominated by spin-polarized d bands.…”

Spin-Resolved Valence Photoemission

“…are varied. In their recent overview, Johnson and G€ untherodt [101] presented, inter alia, spin-resolved electronic structure effects that vary with film thickness [focusing particularly on silver films on Fe(001) and copper films on Cu(001)]. This work is suggested as the first port-of-call for those readers who particularly want more information on this interesting area of magnetism.…”

“…Temperature Dependence and the Persistence of Short-Range Order Above T C The magnetic order and electronic structure of bulk and thin-film transition metals and alloys are very well studied and reviewed [5,97,101,102 and references therein, [156][157][158][159]. However, they still serve to inspire.…”

“…Surface and Bulk Electronic Structure Details of the spin-resolved electronic structures of the ferromagnetic 3d transition metals Fe, Co, and Ni have been explored from both experimental and theoretical viewpoints many times over the last 30 years [5,97,101,102,[157][158][159][160][161]. These are systems that reflect a fascinating interplay between exchange and SO effects together with significant correlation and whose electronic structures are a key factor determining device performance and yet even now questions remain.…”

“…SRPES has been a pivotal complement to theoretical studies for understanding the detailed electronic structure of transition metal and rare-earth magnets and their alloys and compounds -a fact that has been recognized in the reviews that have already covered many aspects of this topic; see, for example, [5,7,97,101,102 and references therein, [156][157][158][159].…”