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Dresden 2011 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 44: Poster Session I

HL 44.32: Poster

Tuesday, March 15, 2011, 18:00–21:00, P3

Spin Noise Spectroscopy — •Fabian Berski1, Jens Hübner1, Fanny Greullet2, Georgy Astakhov2, and Michael Oestreich11Institute for Solid State Physics, Leibniz Universität Hannover, Appelstr. 2, D-30167 Hannover, Germany — 2Faculty of Physics and Astronomy, Julius-Maximilians-Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany

We study the intrinsic magnetization fluctuations of the magnetic semiconductor GaMnAs at its phase transition by spin noise spectroscopy [1]. Spin noise spectroscopy avoids generating additive holes and is therefore a promising tool to unreveal unperturbed spin dynamics and has been widely applied to study spin-dynamics of non magnetic semiconductors by investigating the stochastic deviation from vanishing spin polarization at thermal equilibrium. In this contribution we explore the advancement of spin noise spectroscopy to diluted magnetic semiconductors with the aim to observe the transition from random spin fluctuations to the rise of a collective order. We examine a thin GaMnAs film deposited on a sapphire substrate. GaMnAs can easily be integrated in existing GaAs growth procedures and is consequently an attractive candidate to engineer spintronic devices and serves as an ideal model system to study the effects of combining semiconducting and ferromagnetic properties.

[1] G. M. Müller, M. Oestreich, M. Römer, and J. Hübner, Semiconductor spin noise spectroscopy: Fundamentals, accomplishments, and challenges, Physica E 43, 569 (2010).

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