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@ARTICLE{Michel:280533,
author = {Michel, E. and Ibach, H. and Schneider, C. M.},
title = {{S}pin waves in ultrathin hexagonal cobalt films on
{W}(110), {C}u(111), and {A}u(111) surfaces},
journal = {Physical review / B},
volume = {92},
number = {2},
issn = {1098-0121},
address = {College Park, Md.},
publisher = {APS},
reportid = {FZJ-2016-00301},
pages = {024407},
year = {2015},
abstract = {Spin wave spectra of ultrathin epitaxial cobalt films
deposited on W(110), Cu(111), and Au(111) surfaces are
studied in the wave-vector regime between 0.1Å−1 and
0.7Å−1 using inelastic electron scattering with 6 meV
energy resolution. Up to three different spin wave modes are
resolved for wave vectors q∥<0.35Å−1. The modes are
identified as the acoustic mode and standing modes with one
and two nodes inside the film. The relative weight of the
modes in a particular spectrum may depend critically on the
electron impact energy. For larger wave vectors beyond
q∥>0.35Å−1 and layers thicker than five atom layers the
separate modes merge into a single, broad loss feature.
Since the shape and position of the loss feature depend on
the electron impact energy, a separation into different
modes is nevertheless possible for not too large wave
vectors. The spin wave dispersion curves of films grown on
W(110) agree with those observed on Cu(111) if one takes
into account that on copper the cobalt grows in islands so
that the mean height of the islands is higher than the
nominal coverage. On films grown on Au(111) the low wave
vector spin waves are buried in the high elastic diffuse
scattering caused by the considerable disorder in the films.
The broader appearance of the spectra at higher wave vectors
compared to films grown on W(110) and Cu(111) is
quantitatively accounted for by disorder-induced kinematic
broadening. Because of the granular growth on copper and
gold primarily the spin wave spectrum of cobalt films on
W(110) is amenable to quantitative theoretical analysis.
Such an analysis is not available at present. We show
however, that the dispersion curves are incompatible with
the Heisenberg model as long as only a single,
layer-independent exchange coupling constant is invoked.},
cin = {PGI-6},
ddc = {530},
cid = {I:(DE-Juel1)PGI-6-20110106},
pnm = {522 - Controlling Spin-Based Phenomena (POF3-522)},
pid = {G:(DE-HGF)POF3-522},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000357635100002},
doi = {10.1103/PhysRevB.92.024407},
url = {https://juser.fz-juelich.de/record/280533},
}