Magnetism of Fe films grown on Co(100) studied by spin-resolved Fe3sphotoemission

Abstract

The magnetic properties of fcc Fe films grown on fcc Co͑100͒ have been studied by means of spin-resolved Fe 3s core-level photoemission and characteristics of the measured spin-resolved 3s spectra for fcc Fe films have been investigated. The spin-resolved 3s spectra measured on 3.9 and 6.6 monolayer ͑ML͒ fcc Fe films are similar in spectral shape. The 3s majority-spin spectra for these fcc Fe films show weaker intensity on the high-binding-energy side than the spectrum previously reported for bulk bcc Fe. The spin-resolved 3s spectra for the fcc Fe films are analyzed by cluster model calculation consisting of four Fe atoms. In the analysis by the cluster model calculation, effects of the interatomic configuration interaction on the spin-resolved 3s spectra for fcc Fe films are discussed. Itinerancy of 3d electrons is found to be an important factor in describing the spin-resolved Fe 3s spectra. The z spin momentum estimated by the cluster calculation indicates that both the Fe films are in a high-spin ferromagnetic state near the surface. On the other hand, the spin polarization at the background in the spectrum for the 6.6 ML Fe film is much smaller than that for the 3.9 ML film. This variation of the background spin polarization indicates that the magnetic moment averaged up to deeper layers of Fe film is suppressed in the 6.6 ML film.

Ab initiocalculation of the3sand1score-level x-ray photoemission spectra of iron

“…[13][14][15][16][17][18][19] The spectra are resolved with respect to the spin of photoelectron or equivalently the spin of core hole. Hereafter we call the majority and minority spin as the up and down spin, respectively.…”

Thickness-dependent magnetic anisotropy in ultrathinFe∕Co∕Cu(001)films

“…1 Indeed, this SRT phenomenon has been found in various other systems, for example, Ni/ Fe/ Ni on W͑110͒, 2 Fe/ Cu͑001͒. 3 In addition, there are many experimental studies for the magnetic properties of Fe/ Co/ Cu films [4][5][6][7][8][9] and in these systems the thickness of Co underlayer is mostly in the range of several monolayers. In addition, one may find theoretical studies for the SRT phenomenon in Fe-Co alloy and Fe films on Co͑001͒ surface.…”

Fe–Co magnetic nanoclusters by density functional theory calculations

“…Indeed, when growing Fe thin films on non-magnetic substrates like Cu results in an fcc tetragonal distorted (fct) structure depending on the film thickness showing higher local Fe MM up to 2.5–2.7 µ Β on Cu(100) and 3.3 µ Β on Cu(111) than the Fe bcc (2.1–2.15 µ Β ) [7–10]. To this end, experiments on Fe ultrathin ferromagnetic (FM) fcc tetragonal distorted film grown on magnetic fcc Co(100) coherently produced on non-magnetic fcc Cu(100), showed similar structural and thickness dependent magnetic properties [11–14]. The thinnest (up to 4ML) Fe film's MM is 3.0 µ Β on Co(100) and 2.8 µ Β on Cu(100) while between 5 and 10 ML they drop to 1.1 and 0.8 µ Β , respectively [14].…”