Spin-polarized photoelectron diffraction and valence-band photoemission from MnO(001)

Monte Carlo study of magnetic order at ferromagnetic and antiferromagnetic surfaces: Implications for spin-polarized photoelectron diffraction

“…Hermsmeier et al [6,8] used SPPD to study another antiferromagnetic surface, Mn0(001), and saw a similar effect in the spin asymmetries, but in this case with the transition temperature about 4.5 times higher than the bulk Neel temperature. Fig.…”

“…Based on meanfield theory, the Curie-Weiss constant-should represent a sum over all nn and nnn interactions [24]. Also, prior SPPD results have suggested that there might be a connection between ebulk arid the high-temperature transition temperature [6,8]. We have therefore calculated 9surf/9bulk as a function of Js(nn)/Jb(nn) and J(nnn)/J(nn), as shown in Fig.…”

“…in MnO) is semi-quantitatively predicted by spin-dependent diffraction calculations based only on results for zero-temperature and a hightemperature paramagnetic limit [8,9].…”

“…Spin-polarized photoelectron diffraction (SPPD) has been proposed as a probe for studying short-range magnetic order in both ferromagnetic and antiferromagnetic materials [4][5][6][7][8][9][10]. ln its simplest form, SPPD makes use of multiplet-split core-level binding energies as internally-referenced sources of spin-polarized electrons, with no external spin detector then being necessary.…”

“…In this paper, we have applied Monte Carlo modelling to both ferromagnetic and antiferromagnetic surfaces, for the later case considered systems without and with frustrated next-nearest-neighbor interactions, explored a broader range of relative interaction parameters, and considered the relationship of these results to both prior theoretical calculations [2,3] and previous experimental data suggesting surface magnetic order behavior different from the bulk [4][5][6][7][8][9][11][12]. Special emphasis is placed on prior experimental studies by spin-polarized photoelectron diffraction [4][5][6][7][8][9].…”