FEMTOSECOND NEAR-FIELD SPIN MICROSCOPY IN DIGITAL MAGNETIC HETEROSTRUCTURES

Citation
J. Levy et al., FEMTOSECOND NEAR-FIELD SPIN MICROSCOPY IN DIGITAL MAGNETIC HETEROSTRUCTURES, Journal of applied physics, 79(8), 1996, pp. 6095-6100
Citations number
19
Categorie Soggetti
Physics, Applied
Journal title
ISSN journal
00218979
Volume
79
Issue
8
Year of publication
1996
Part
2B
Pages
6095 - 6100
Database
ISI
SICI code
0021-8979(1996)79:8<6095:FNSMID>2.0.ZU;2-6
Abstract
We have designed a low-temperature femtosecond-resolved near-field sca nning optical microscope to study spatiotemporal excitonic spin behavi or in magnetic semiconductor heterostructures. Local disorder introduc ed by focused-ion-beam implantation reduces the otherwise large Zeeman splittings in modest magnetic fields, creating a planar spin-dependen t energy landscape for diffusing carriers. Near-field polarization-res olved static and femtosecond measurements map out excitonic spin behav ior with similar to 125 nm spatial resolution, revealing spin-dependen t diffusion. We demonstrate the applicability of two distinct time res olved techniques in the near held, and discuss Limitations on the meas urement of polarized luminescence from semiconductors in the near fiel d. (C) 1996 American Institute of Physics.