75.50.Pp Magnetic semiconductors
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- Ferromagnetische Halbleiter (1)
- Ferromagnetische Schicht (1)
- Galliumarsenid (1)
- Halbleiterdiode (1)
- Magnetoelektronik (1)
- Magnetotransport (1)
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- Manganarsenide (1)
- Resonanz-Tunneldiode (1)
- Semimagnetischer Halbleiter (1)
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Diese Arbeit enthält Untersuchungen von Magnetowiderstandseffekten in (Ga,Mn)As basierten ferromagnetischen Halbleiterdioden. Die Resultate wurden in den folgenden Artikeln veröffentlicht: [1] C. Rüster, T. Borzenko, C. Gould, G. Schmidt, L.W. Molenkamp, X. Liu, T.J.Wojtowicz, J.K. Furdyna, Z.G. Yu and M. Flatt´e, Very Large Magnetoresistance in Lateral Ferromagnetic (Ga,Mn)As Wires with Nanoconstrictions, Physical Review Letters 91, 216602 (2003). [2] C. Gould, C. Rüster, T. Jungwirth, E. Girgis, G.M. Schott, R. Giraud, K. Brunner, G. Schmidt and L.W. Molenkamp, Tunneling Anisotropic Magnetoresistance: A Spin-Valve-Like Tunnel Magnetoresistance Using a Single Magnetic Layer, Physical Review Letters 93, 117203 (2004). [3] C. Rüster, C. Gould, T. Jungwirth, J. Sinova, G.M. Schott, R. Giraud, K. Brunner, G. Schmidt and L.W. Molenkamp, Very Large Tunneling Anisotropic Magnetoresistance of a (Ga,Mn)As/GaAs/(Ga,Mn)As Stack, Physical Review Letters 94, 027203 (2005). [4] C. Rüster and C. Gould, T. Jungwirth, E. Girgis, G.M. Schott, R. Giraud, K. Brunner, G. Schmidt and L.W. Molenkamp, Tunneling anisotropic magnetoresistance: Creating a spin-valve-like signal using a single ferromagnetic semiconductor layer, Journal of Applied Physics 97, 10C506 (2005).
In this work we investigate magnetic resonant tunneling diode (RTD) structures for spin manipulation. All-II-VI semiconductor RTD structures based on [Zn,Be]Se are grown by molecular beam epitaxy. We observe a strong, magnetic field induced, splitting of the resonance peaks in the I-V characteristics of RTDs with [Zn,Mn]Se diluted magnetic semiconductors (DMS) quantum well. The splitting saturates at high fields and has strong temperature dependence. A phonon replica of the resonance is also observed and has similar behaviour to the peak. We develop a model based on the giant Zeeman splitting of the spin levels in the DMS quantum well in order to explain the magnetic field induced behaviour of the resonance.