Brandt, R.; Ganss, F.; Rückriem, R.; Senn, T.; Brombacher, C.; Krone, P.; Albrecht, M.; Schmidt, H.: Three-dimensional shape dependent magnetization dynamics in single FePt nanomagnets. Physical Review B 86 (2012), p. 094426/1-5
10.1103/PhysRevB.86.094426
Open Access Version (externer Anbieter)
Abstract:
We report the dependence of the intrinsic spin-wave spectra on the three-dimensional shape in single FePt nanomagnetic elements. In contrast to the well-known center and edge modes in flat, circular nanodisks, curved nanomagnets with identical nominal thickness and footprint exhibit a rich multimode spectrum with qualitatively different dependence on applied field, such as a low-frequency “pinned” mode. Dynamic micromagnetic modeling shows that the experimentally observed modes originate from different sections of the nanomagnet with vastly different demagnetization fields. Thus, controlled shaping of a nanomagnet in all three dimensions creates the possibility of magnetization dynamics by design.