We study the magnetic aftereffect in compressively strained GaMnAs by means of Kerr microscopy. Under constant magnetic field conditions, a dramatic decrease in domain-wall velocity with time is observed, which is attributed to the irreversible magnetic aftereffect. The time- and space-resolved dynamics of single domain walls are used to derive the time dependence of the magnetization that is modeled considering two coexisting relaxation processes on fast and slow time scales. From fitting of the magnetization vs time curves, the activation volumes for two different GaMnAs samples have been estimated.
Herrera Diez, L., Honolka, J., Kern, K., Kronmüller, H., Placidi, E., Arciprete, F., et al. (2010). Magnetic aftereffect in compressively strained GaMnAs studied using Kerr microscopy. PHYSICAL REVIEW. B, CONDENSED MATTER AND MATERIALS PHYSICS, 81, 094412 [10.1103/PhysRevB.81.094412].
Magnetic aftereffect in compressively strained GaMnAs studied using Kerr microscopy
ARCIPRETE, FABRIZIO;
2010-03-11
Abstract
We study the magnetic aftereffect in compressively strained GaMnAs by means of Kerr microscopy. Under constant magnetic field conditions, a dramatic decrease in domain-wall velocity with time is observed, which is attributed to the irreversible magnetic aftereffect. The time- and space-resolved dynamics of single domain walls are used to derive the time dependence of the magnetization that is modeled considering two coexisting relaxation processes on fast and slow time scales. From fitting of the magnetization vs time curves, the activation volumes for two different GaMnAs samples have been estimated.Questo articolo è pubblicato sotto una Licenza Licenza Creative Commons
