We have found an error in Eq. (4) of the original article.1 Specifically, it is in the definition of the variable ωH, which should contain the vacuum permeability μ0 as a factor. The correct definition reads ωH=γμ0H.

The error in the original article was purely typographical and does not affect any of the data or calculations presented in the article.

1.
J.
Förster
,
S.
Wintz
,
J.
Bailey
,
S.
Finizio
,
E.
Josten
,
C.
Dubs
,
D. A.
Bozhko
,
H.
Stoll
,
G.
Dieterle
,
N.
Träger
,
J.
Raabe
,
A. N.
Slavin
,
M.
Weigand
,
J.
Gräfe
, and
G.
Schütz
, “
Nanoscale x-ray imaging of spin dynamics in yttrium iron garnet
,”
J. Appl. Phys.
126
,
173909
(
2019
).