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.
Magnetic aftereffect in compressively strained GaMnAs studied using Kerr microscopy / Herrera Diez, L.; Honolka, J.; Kern, K.; Kronmuller, H.; Placidi, E.; Arciprete, F.; Rushforth, A. W.; Campion, R. P.; Gallagher, B. L.. - In: PHYSICAL REVIEW. B, CONDENSED MATTER AND MATERIALS PHYSICS. - ISSN 1098-0121. - 81:9(2010). [10.1103/PhysRevB.81.094412]
Magnetic aftereffect in compressively strained GaMnAs studied using Kerr microscopy
Placidi E.;
2010
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.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
