Regensburg 2016 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 34: Magnetic Semiconductors I (Joint session of HL and MA, organized by MA)
HL 34.1: Vortrag
Dienstag, 8. März 2016, 14:00–14:15, H31
Magnetic Semiconductor (Ga,Mn)As Studied by Fluctuation Spectroscopy — •Martin Lonsky1, Jan Teschabai-Oglu1, Klaus Pierz2, Hans Werner Schumacher2, and Jens Müller1 — 1Physikalisches Institut, Goethe-Universität, Frankfurt (M), Germany — 2Physikalisch-Technische Bundesanstalt, 38116 Braunschweig, Germany
In spintronics, both charge and spin degrees of freedom of the electronic transport properties are utilized. Recent studies on diluted magnetic semiconductors (DMS), as for instance (Ga,Mn)As, raised hopes of applications combining the logic operations of semiconductor devices with the information storage capabilities of magnetic elements. However, ferromagnetism at room temperature has not yet been achieved in DMS, and the underlying mechanism is still subject of investigation. In this context, theoretical studies have discussed the percolation of magnetic polarons as a possible origin of spontaneous magnetization [1]. Motivated by recent results of a diverging 1/f-noise magnitude in the ferromagnetic semimetal EuB6, where the existence of percolating nanoscale magnetic clusters has been demonstrated [2], we apply fluctuation spectroscopy to (Ga,Mn)As in order to gain a better understanding of the coupling between charge transport and magnetism. Systematic (magneto-)transport studies are conducted on epitaxial thin films of (Ga,Mn)As [3] with different growth parameters.
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