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TT: Fachverband Tiefe Temperaturen

TT 22: CE: Spin Systems and Itinerant Magnets

TT 22.8: Vortrag

Mittwoch, 24. März 2010, 11:30–11:45, H21

Dynamics in the B-T phase diagram of MnSi measured with MIEZE — •Georg Brandl^{1, 2}, Robert Georgii^{1, 2}, Christian Pfleiderer¹, and Peter Böni¹ — ¹Physik Department E21, Technische Universität München, 85747 Garching, Germany — ²Forschungsneutronenquelle Heinz Maier-Leibnitz, Technische Universität München, 85747 Garching, Germany

MIEZE (Modulation of IntEnsity by Zero Effort) has been proposed some time ago as a variant of the NRSE technique [1], having the advantage of preparing the beam modulation before the sample. This allows measurements under experimental conditions causing depolarization, such as magnetic samples or samples in an applied magnetic field without losing signal intensity, while keeping the high resolution of the spin echo technique. Yet, despite being potentially very attractive the MIEZE technique has so far not been used to tackle real scientific problems. We report the development of a MIEZE set up on the very cold neutron beam line MIRA at the FRM II. We have used the MIEZE technique at MIRA to study the skyrmion lattice in the B20 compound MnSi [2], a novel magnetic state composed of particle-like spin textures with non-trivial topology that forms in an applied magnetic field. We have measured the linewidth of the magnetic scattering at the position of the magnetic satellites throughout the B-T-diagram of MnSi. The results give us a clue on the stability of the various magnetic structures of MnSi.

[1] R. Gähler, R. Golub, T. Keller, Physica B, 180, 899 (1992)

[2] S. Mühlbauer et al., Science 323, 915 (2009)