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Schwerpunktprogramm SPP 1285
Halbleiter Spintronik
Spintronik > Projekte > Projektansicht


Prof. Dr. Daniel Hägele

Ruhr-Universität Bochum
Arbeitsgruppe Festkörperspektroskopie
Universitätsstraße 150
D-44780 Bochum

Tel.:0234 32 28327
Fax:0234 32 14336
Ferromagnetic GaN based structures for room temperature spintronics: spin dynamics and spin interactions

The project aims towards an efficient, electrical room temperature injection of spins within semiconductors at room temperature, which is an important prerequisite for the practical application of semiconductor spintronics. In this context GaN has to be considered a prime candidate, as it is the only material which is already widely used in electronic industry and which by low doping with magnetic ions exhibits room temperature ferromagnetism. We will use the methods of ultrafast laser spectroscopy to reveal the influence of magnetic ions on the dynamics of the electron spins in semiconductor structures, which must be well understood for the successful design of spintronic devices. The very important question of long electron spin lifetimes at room temperature will be investigated by the same methods in quasi two-dimensional non-magnetic GaN systems. Earlier studies on other material systems have revealed that such structures can exhibit lifetimes that are almost 100 times longer than in three-dimensional systems. As a long-term perspective, we will pursue the demonstration of a room temperature spin LED (light emitting diode) where ferromagnetic GaN is used as a spin injector into the light emitting region. The spin LED will combine our results on magnetic and non-magnetic GaN.


Wichtige Termine:

15. Sept. 2013:
Deadline für den Sonderband Semiconductor Spintronics (DFG-Abschlussbericht) in physica status solidi b
(nähere Informationen wurden per Email zugeschickt)

30. Sept. - 2. Okt. 2013:
Abschlusstreffen des Schwerpunktprogramms "International workshop on semiconductor spintronics" in der Residenz Würzburg
(nähere Informationen)

Aktuelle Veröffentlichung(en):

C. Drexler, S.A. Tarasenko, P. Olbrich, J. Karch, M. Hirmer, F. Müller, M. Gmitra, J. Fabian, R. Yakimova, S. Lara-Avila, S. Kubatkin, M. Wang, R. Vajtai, P. M. Ajayan, J. Kono, and S.D. Ganichev :  "Magnetic quantum ratchet effect in graphene" Nature Nanotechnology 8, 104 (2013)

J.H. Buß, J. Rudolph, S. Shvarkov, H. Hardtdegen, A.D. Wieck, and D. Hägele:  "Long electron spin coherence in ion‐implanted GaN: The role of localization" Appl. Phys. Lett. 102, 192102 (2013)

D.J. English, J. Hübner, P.S. Eldridge, D. Taylor, M. Henini, R.T. Harley, and M. Oestreich:  "Effect of symmetry reduction on the spin dynamics of (001)-oriented GaAs quantum wells" Phys. Rev. B 87, 075304 (2013)

V.L. Korenev, I.A. Akimov, S.V. Zaitsev, V.F. Sapega, L. Langer, D.R. Yakovlev, Yu. A. Danilov, and M. Bayer:  "Dynamic spin polarization by orientation-dependent separation in a ferromagnet–semiconductor hybrid" Nature Communications 3, 959 (2012)

M. Althammer, E.-M. Karrer-Müller, S.T.B. Goennenwein, M. Opel, R. Gross:  "Spin transport and spin dephasing in zinc oxide" Appl. Phys. Lett. 101, 082404 (2012)