Dresden 2006 – wissenschaftliches Programm

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SYET: Dynamics of electron transfer processes at surfaces

SYET 1: Dynamics of electron transfer processes at surfaces

SYET 1.1: Hauptvortrag

Donnerstag, 30. März 2006, 10:00–10:30, HSZ 04

Ultrafast coherent control of Spin- and magnetization dynamics — •Theo Rasing — IMM, Radboud University Nijmegen, Toernooiveld 1, N-6525 ED Nijmegen, The Netherlands

The manipulation of the electron spin is not only relevant for magnetic storage but may also lead to the development of novel electronic devices with new characteristics (so-called spintronics) or to quantum computation. Therefore, the investigations of the physical mechanisms underlying the manipulation of electron spin in ferromagnets, semiconductors and hybrid ferromagnet/semiconductor structures constitute at present an exciting area of research.

Femto-second laser excitation opens the way to excite magnetic systems on a time scale much shorter than fundamental time scales such as spin-lattice relaxation or precession times. This has already lead to surprising and exciting results like changes in magnetization on a sub-picoscond time scale.

Recent progress in this area will be discussed, demonstrating in particular the use of time resolved linear and nonlinear optical methods to investigate the static and dynamic properties of magnetically ordered structures and the possibility of direct spin manipulation with optical fields[1,2].

[1] A. Kimel, A. Kirilyuk, P.A. Usachev, R.V. Pisarev, A.M. Balbashov and Th. Rasing, Nature 435, 655 (2005) [2] F. Hansteen, A.V. Kimel, A. Kirilyuk and Th. Rasing, PRL July 15th (2005).