Resonance Frequency of Ferromagnetic Thin Film Controlled by Rectangle Antidot Arrays

We have investigated both the static and dynamic magnetic properties of rectangle antidot arrays in a ferromagnetic thin film. The thin films are Fe
₆₆
Co
₁₇
B
₁₆
Si
₁
amorphous alloy with different thicknesses (40, 80, 160, and 320 nm) on a Si substrate. Vibrating sample magnetometry and microstrip transmission line measurements are conducted to associate the microwave magnetic analysis of the antidot arrays with hysteresis studies. The patterned films result in the change of ferromagnetic resonance from single-band to multiband, and the destruction of in-plane uniaxial anisotropy. Hence, the mechanisms of multiresonance are proposed to be related to the special domain-wall motion and spin-wave modes what is caused by the demagnetizing field in per-unit area. To study the magnetic torques in per-unit area, The Object Oriented MicroMagnetic Framework (OOMMF) is used to simulate the dynamic magnetization process.