The microwave response of magnetic materials have been studied and utilized for decades. Most of the attentions were focused on the insulating magnetic materials. Recently, due to the development of spintronics, there have been increasing interests in the microwave dynamics of one-dimensional system such as magnetic nanowire, and two-dimensional system such as metallic magnetic thin film.

In these materials, the ferromagnetic resonance and hybrid spin wave modes with characteristic frequencies around microwave frequency are studied. The most important parameters that control these dynamic behaviors are the internal fields and damping constant. In this work, several experiments are designed to investigate the origin of the dynamic parameters and models are developed to explain such behaviors. Based on the study, several methods are proposed to tailor the dynamic properties of magnetic nanowires and magnetic thin films.

On the other hand, due to the strong response to microwave, these magnetic materials may have unique applications as microwave devices. In this work, it is shown that a magnetic nanowire based structure has an analog memory effect that can be used as a microwave pulse detector. Combining with the prosperous spintronics studies, several microwave detectors as well as on chip network analyzer and spectrum analyzer are also demonstrated.