Growth and thermal stability of Fe, Ni, Rh and Pd layers on the (111)W crystal face

Kołaczkiewicz, J.; Bauer, E.

doi:10.1016/s0039-6028(98)00816-4

Cited by 28 publications

(26 citation statements)

References 17 publications

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“…These changes and those that follow at larger thickness are in very good agreement with work function changes that were reported previously in Ref. 18, provided we identify the monolayer unit in that work to be the PML. This comparison resolves the ambiguity about the film thickness scale in Ref.…”

Section: A Growthsupporting

confidence: 91%

“…The work function change determined here, in particular, can be compared directly to the results of similar measurements that were reported in Ref. 18. No spatially distinct features were observed in bright field LEEM images during Fe deposition.…”

Section: A Growthsupporting

confidence: 78%

“…18, the meaning of the monolayer coverage unit in that work, i.e., geometric (ML) or physical (PML) monolayer, must first be clarified. We have done this by measuring work function changes and performing complementary LEEM imaging experiments during Fe deposition at room temperature.…”

Section: A Growthmentioning

confidence: 99%

“…[15][16][17] Interestingly, it was reported that fcc Fe films can also be stabilized on the bcc W(111) substrate surface. 18 It was observed using low energy electron diffraction (LEED) that Fe grows pseudomorphically at room temperature up to a thickness that was identified as 2 monolayers. The presence of superstructure diffraction spots between 2 and 4 monolayers was interpreted as evidence of an fcc film that is laterally contracted by 1% compared to bulk Fe, assuming a bulk lattice constant of 3.61Å, with its 112 direction parallel to the substrate 110 direction.…”

Section: Introductionmentioning

confidence: 99%

“…The presence of an fcc film above 4 monolayers with the same orientation but with 1.3% lateral lattice expansion compared to bulk fcc Fe was also inferred from LEED observations. 18 Formation of pseudomorphic (ps) bcc Fe/W(111) requires close to 10% tensile strain of the Fe film. On the other hand, the lattice constant of the W(111) surface (4.47Å) is very close to the next-nearest neighbor distance in the fcc Fe(111) layer (4.42Å).…”

Section: Introductionmentioning

confidence: 99%

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Growth, magnetism and ferromagnetic thickness gap in Fe films on the W(111) surface

Zdyb

Bauer

et al. 2013

Phys. Rev. B

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The growth, structure, and magnetism of Fe films on the W(111) surface were investigated using low energy electron microscopy (LEEM) and diffraction (LEED), spin polarized LEEM (SPLEEM), and work function measurements. In contrast to an earlier report that Fe grows with fcc structure following initial pseudomorpic layer growth, we observe no evidence of the formation of fcc Fe over the entire thickness range studied, up to 18 monolayers (ML). Observations are instead consistent with the formation of a well-ordered, laterally (tensile) strained bcc Fe layer that gradually relaxes vertically and develops increasing disorder with increasing thickness. Ferromagnetic order appears at 6 ML, but surprisingly vanishes at 8 ML, and reappears just as suddenly at 9 ML during Fe deposition at room temperature. Ferromagnetism between 6 and 8 ML also vanishes at only 5 deg above room temperature. The magnetization direction of a monodomain structure remains constant before and after the ferromagnetic thickness gap at 8-9 ML until the formation of a multidomain structure at about 12 ML. Variations of exchange asymmetry in spin-polarized elastic electron scattering are also observed with increasing film thickness, particularly above 12 ML, that indicate changes in the spin-polarized electron band structure above the vacuum level. The evolution of magnetism and exchange asymmetry with increasing thickness and the appearance of the ferromagnetic gap are attributed to structural and morphological changes in the strained Fe layer, which eventually lead to a relaxed although highly disordered bcc Fe layer.

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Section: A Growthsupporting

confidence: 91%

Section: A Growthsupporting

confidence: 78%

Section: A Growthmentioning

confidence: 99%