ABSTRACT
This chapter presents studies of the magnetization dynamics of nanoscale magnetic elements of square shape. It provides results of studies of precessional magnetization dynamics in arrays of magnetic nano-elements in which the exchange interaction, the edge roughness, and the breakdown of the translational symmetry play a key role in the observed phenomena. From a technological point of view, a proper understanding of the magnetization dynamics in such elements underpins the operation of future recording head sensors, magnetic random access memory, and spin-torque devices. The assumption that the magnetostatic interaction dominates the magnetization dynamics in magnetic elements is one concept that works well in micron-sized elements but fails in nano-sized magnetic elements. The experimental points from both sets of measurements were fitted to a macrospin model for a continuous magnetic film. The internal magnetic field in elongated or flattened ferromagnetic elements is different when the external magnetic field is applied along the long and short axes.
