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Proceedings Paper

Magnetization dynamics down to zero field in dilute (Cd,Mn)Te quantum wells
Author(s): Mateusz Goryca
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Paper Abstract

In this paper we describe the study of the magnetization dynamics after a short magnetic pulse, down to zero field and with a temporal resolution of a few ns, in (Cd,Mn)Te QWs with 0.2% to 1.5% Mn, and various densities of carriers. Short pulses of magnetic field were applied in the Faraday configuration by a small magnetic coil mounted at the surface of the sample. We analyzed the temporal evolution of the giant Zeeman shift of spectroscopic lines after the pulse with resolution down to a few nanoseconds. This evolution reproduces the dynamics of the magnetization of the Mn system. The dynamics in absence of magnetic field was found to be up to three orders of magnitude faster than that at 1 T. Hyperfine interaction and strain are mainly responsible for this fast decay. The influence of a hole gas is clearly visible: at zero field anisotropic holes stabilize the system of Mn ions, while in a magnetic field of 1 T they are known to speed up the decay by opening an additional relaxation channel.

Paper Details

Date Published: 18 August 2009
PDF: 9 pages
Proc. SPIE 7398, Spintronics II, 739807 (18 August 2009); doi: 10.1117/12.825066
Show Author Affiliations
Mateusz Goryca, Univ. of Warsaw (Poland)

Published in SPIE Proceedings Vol. 7398:
Spintronics II
Manijeh Razeghi; Henri-Jean M. Drouhin; Jean-Eric Wegrowe, Editor(s)

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