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Your search keyword '"Bootsmann, M.-T."' showing total 11 results
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11 results on '"Bootsmann, M.-T."'

4. Switching of magnetostrictive micro-dot arrays by mechanical strain

Author

Bootsmann, M.-T., Dokupil, S., Quandt, E., Ivanov, T., Abedinov, N. Caesar, and Lohndorf, M.

Subjects
Electromagnetism -- Research, Sensors -- Research, Dielectric films -- Research, Dielectric films -- Magnetic properties, Thin films -- Research, Thin films -- Magnetic properties, Business, Electronics, Electronics and electrical industries
Abstract

This paper investigates the switching behavior of magnetostrictive micro-dot arrays by mechanical strain. These amorphous FeCoBSi micro-dot arrays with diameters of 1-5 [micro]m and a thickness of 20 nm have been prepared on MEMS fabricated membrane structures. Magnetic force microscopy (MFM) has been used to obtain a spatially resolved switching behavior of these dots at different level of mechanical strain. For 20-nm-thick FeCoBSi dots, we have observed a strain induced switching starting at a level of about 0.04% of strain. In addition, finite-element simulations have been performed in order to correlate the MFM results with the local strain distribution of the membrane structure. Index Terms--Magnetostriction, micro-fabrication, strain sensors, thin films.

Published
2005

5. Acoustic plasmons and indirect intersubband excitations in tunneling-coupled GaAs-AlxGa1ÀxAs double quantum wells

Author

Bootsmann, M.-T., Hu, C. M., Heyn, Ch., Heitmann, Detlef, and Schüller, Christian

Subjects
gallium arsenide, aluminium compounds, III-V semiconductors, semiconductor quantum wells, plasmons, light scattering, carrier density, RPA calculations, Condensed Matter::Mesoscopic Systems and Quantum Hall Effect, 530 Physik
Abstract

In photoluminescence spectroscopy of a low-mobility two-dimensional electron gas subjected to a quantizing magnetic field, we observe an anomaly around nu= (1/3) at a very low temperature (0.1 K) and an intermediate electron density (0.9×1011 cm–2). The anomaly is explained as due to perturbation of the incompressible liquid at the Laughlin state due to close proximity of a localized charged exciton which creates a fractionally charged quasihole in the liquid. The anomaly of ~2 meV can be destroyed by applying a small thermal energy of ~0.2 meV that is enough to close the quasihole energy gap.

Published
2003
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