Soft magnetic property and magnetization reversal mechanism of Sm doped FeCo thin film for high-frequency application

► Magnetic and structural properties of FeCoSm films with variation of Sm are reported. ► The addition of Sm up to a certain level leads to amorphous FeCoSm films. ► In-plane uniaxial anisotropy is obtained as long as Sm is doped. ► Magnetization reversal follows either a Stoner-Wohlfarth model or a Kondorsky model. ► Resonance frequency can be tuned in the range of 5.2-11.8 GHz by the content of Sm.