17 January 2011 Investigation of ferromagnetic properties of LSMO nanolayers by laser modulated reflectance probe
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Proceedings Volume 7747, 16th International School on Quantum Electronics: Laser Physics and Applications; 774709 (2011) https://doi.org/10.1117/12.882111
Event: XVI International School on Quantum Electronics: Laser Physics and Applications, 2010, Nessebar, Bulgaria
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.
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V. Pencheva, V. Pencheva, E. Alipieva, E. Alipieva, S. Penchev, S. Penchev, I. Nedkov, I. Nedkov, T. Kutzarova, T. Kutzarova, } "Investigation of ferromagnetic properties of LSMO nanolayers by laser modulated reflectance probe", Proc. SPIE 7747, 16th International School on Quantum Electronics: Laser Physics and Applications, 774709 (17 January 2011); doi: 10.1117/12.882111; https://doi.org/10.1117/12.882111
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