Anisotropic FMR Peak Widths in Fe-Co Single Crystal Thin Films

We investigated
$Q$
-band (
$f$
= 35 GHz) and
$X$
-band (
$f$
= 9 GHz) ferromagnetic resonance (FMR) spectra of Fe1-xCox single crystal thin films (
$x < 0.5$
) in the (001)
$_{\mathrm {Fe-Co}}$
film plane in terms of magnetostriction. The FMR peak width
$\Delta H(f)$
and the magnetostriction
$\lambda $
had the maximum and minimum values at the
$\langle 100\rangle $
and the
$\langle 110\rangle $
directions of the specimens. The periodic variations of
$\Delta H(f)$
were due to the anisotropic variations of the frequency-independent part
$\Delta H_{0}$
in
$\Delta H(f)$
. The linear relationship existed between
$\Delta H_{0}$
and
$\lambda $
.