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Proceedings Paper

Investigation of ferromagnetic properties of LSMO nanolayers by laser modulated reflectance probe
Author(s): V. Pencheva; E. Alipieva; S. Penchev; I. Nedkov; T. Kutzarova
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Paper Abstract

Modulated optical reflectance (MOR) technique is employed for defectoscopy and structural analysis of La2/3Sr1/3MnO3(LSMO) ferromagnetic nanolayers. The optical reflectance is affected by the change of free charge carrier density due to periodic photothermal modulation described by Drude effect. A dual wavelength setup of a pulsed heating laser and a probe CW laser, whereas the laser focal spots are precisely aligned on the scanned sample surface, provides electrical signal proportional to the variation of optical reflectance at each measurement point. The probe beam is modulated selectively by reflection without interference by the substrate properties or external fields. It is shown theoretically and experimentally that MOR signal is proportional to the thermal derivative of magnetoresistance. The described contactless measurement may find important application in investigation of a range of new magnetoelectric devices.

Paper Details

Date Published: 17 January 2011
PDF: 7 pages
Proc. SPIE 7747, 16th International School on Quantum Electronics: Laser Physics and Applications, 774709 (17 January 2011); doi: 10.1117/12.882111
Show Author Affiliations
V. Pencheva, Institute of Electronics (Bulgaria)
E. Alipieva, Institute of Electronics (Bulgaria)
S. Penchev, Institute of Electronics (Bulgaria)
I. Nedkov, Institute of Electronics (Bulgaria)
T. Kutzarova, Institute of Electronics (Bulgaria)

Published in SPIE Proceedings Vol. 7747:
16th International School on Quantum Electronics: Laser Physics and Applications
Tanja Dreischuh; Dimitar Slavov, Editor(s)

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