Time resolved magnetic ordering and photo-induced gyrotropy at room temperature in CdMgTe–CdMnTe semiconductor micro-cavities

• Published in: Solid state communications 2005-10, Vol.136 (3), p.147-151
• Main Authors: Bahbah, S., Frey, R., André, R., Roosen, G., Flytzanis, C.
• Format: Article
• Language: English
• Subjects: A. Nanostructure; A. Quantum wells; A. Semiconductors; Condensed matter: electronic structure, electrical, magnetic, and optical properties; D. Exchange and superexchange; D. Spin dynamics; E. Non-linear optics; Exact sciences and technology; Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation; Optical properties of low-dimensional, mesoscopic, and nanoscale materials and structures; Physics
• ISSN: 0038-1098; 1879-2766
• DOI: 10.1016/j.ssc.2005.07.013

Using a picosecond pump and probe time-resolved technique we evidence a single pump pulse photo-induced magnetic ordering in a Mn-doped semiconductor magneto-photonic microcavity operating in the strong coupling regime at room temperature. This nanosecond duration magnetization is attributed to a magnetic ordering of the Mn-impurities mediated through photo-generated holes and enhanced through the confinement. It is distinct from the preceding short lived photo-induced spin orientation of carriers also evidenced by our technique for circularly polarized pump beams. The photo-generated magnetic flux density amounts to a 1 kG for beam fluences of few tens μJ cm −2 and effective Mn concentrations of 5 nm −3; large photo-induced magneto-optic Kerr rotations are also evidenced.