Influences of hole- or pit-shaped defects on static and dynamic properties of rectangular submicron ferromagnetic particles

Based on micromagnetic simulations, we shall demonstrate that influences of hole- or pit-shaped artificial defects on magnetic properties of rectangular submicron ferromagnetic particle are sensitive to the defect location, and dependent in a somewhat complicated way on size and shape of the defects. Generally, these defects may lead the main resonance peak of magnetic susceptibility spectrum to shift to a lower frequency. Our work may provide an effective way to tailor and design static and dynamic properties of submicron ferromagnetic particle by patterning artificial defects.