Dynamics in magnetic micro- and nanostructures

For applications in sensors and in data storage, the dynamic properties of micro- and nanostructures gain increasing attendance. The fundamental excitations in these objects are con-fined spin waves, and it is useful in particular to understand their properties in view of the noise spectrum in sensor and MRAM applications.
The lecture addresses the dynamics in homogeneously and inhomogeneously magnetized ob-jects starting with an introduction into spin waves and the effects of finite dimensions. In inhomogeneous systems the excitation spectrum is complex, and new phenomena, like local-ization and tunneling of modes are discussed. The key points are illustrated by results ob-tained by space- and time-resolved Brillouin-light-scattering technique, which allows one to follow experimentally the propagation of spin wave packets and to present the results in an animated format. To conclude the lecture, the analysis of ultra-high-frequency dynamic prop-erties (2-100 GHz) of small magnetic elements with spatial resolution in the 300 nanometer range is presented.