Extensive Kerr microscopy studies reveal strongly temperature-dependent domain wall (DW) dynamics in Hall bars made from compressively strained GaMnAs. Depending on the temperature, magnetic charging of the DWs is observed, and the nucleation rates depend on the Hall geometry with respect to the crystal axes. Above a critical temperature where a biaxial-to-uniaxial anisotropy transition occurs, a drastic increase in nucleation events is observed. Below this temperature, the nucleation of domains tends to be rather insensitive to temperature. This spatially resolved study of the DW dynamics in patterned GaMnAs at variable temperature has important implications for potential applications in single DW magneto-logic devices made from ferromagnetic semiconductors.

Temperature-dependent néel wall dynamics in GaMnAs/GaAs / Honolka, J.; Herrera Diez, L.; Kremer, R. K.; Kern, K.; Placidi, E.; Arciprete, F.. - In: NEW JOURNAL OF PHYSICS. - ISSN 1367-2630. - 12:9(2010). [10.1088/1367-2630/12/9/093022]

Temperature-dependent néel wall dynamics in GaMnAs/GaAs

Placidi E.;
2010

Abstract

Extensive Kerr microscopy studies reveal strongly temperature-dependent domain wall (DW) dynamics in Hall bars made from compressively strained GaMnAs. Depending on the temperature, magnetic charging of the DWs is observed, and the nucleation rates depend on the Hall geometry with respect to the crystal axes. Above a critical temperature where a biaxial-to-uniaxial anisotropy transition occurs, a drastic increase in nucleation events is observed. Below this temperature, the nucleation of domains tends to be rather insensitive to temperature. This spatially resolved study of the DW dynamics in patterned GaMnAs at variable temperature has important implications for potential applications in single DW magneto-logic devices made from ferromagnetic semiconductors.
2010
Domain walls and domain structure, Magnetic phase boundaries (including magnetic transitions, metamagnetism, etc.), Reprogrammable magnetic logic, Domain structure (including magnetic bubbles), Magnetic anisotropy, Magnetic semiconductors
01 Pubblicazione su rivista::01a Articolo in rivista
Temperature-dependent néel wall dynamics in GaMnAs/GaAs / Honolka, J.; Herrera Diez, L.; Kremer, R. K.; Kern, K.; Placidi, E.; Arciprete, F.. - In: NEW JOURNAL OF PHYSICS. - ISSN 1367-2630. - 12:9(2010). [10.1088/1367-2630/12/9/093022]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1326847
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