Pulsed Precessional Motion
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Beschreibung
Pulsed Precessional Motion combines the application of a short
rise time magnetic field pulse to tip the magnetization away from
equilibrium direction and the measurement of the resulting
oscillation in the time domain.
Micron sized ferromagnetic permalloy disks exhibiting an in-plane
ferromagnetic vortex structure are excited by a perpendicular
magnetic field pulse and their modal structure is analyzed. Two
types of modes are observed: radially symmetric modes with
circular nodes and symmetry breaking modes with diametric nodes.
The frequency of the modes with circular nodes increases with the
number of nodes. In contrast, the frequency of the modes with
diametric nodes decreases with the number of nodes. By a fourier
filtering technique the time dependence of individual modes are
separated and analyzed. These measurements are the first clear
demonstration that mode-mode coupling plays a significant role in
magnetization dynamics.
Autor*in
Matthias Buess
Themen in »Pulsed Precessional Motion«
Eigen-modes Kerr Magnetism Permalloy Time resolved