Ferromagnetic Resonance Study of ${\hbox {Fe}}_{3}{\hbox {O}}_{4}$ Thin Film

Ferromagnetic resonance (FMR) was used to study the magnetic properties of Fe
₃
O
₄
films to characterize the Verwey transition. Epitaxial, smooth films were deposited by molecular beam epitaxy. FMR spectra were recorded using a 9.49 GHz Brucker EMX system from room temperature to 80 K with a magnetic field applied perpendicular to the film surface. A single resonance feature was observed above the Verwey transition temperature (T
_v
~ 105 K). However below T
_v
additional features were observed indicating the presence of complex magnetic interactions below T
_v
.