Investigation of ferromagnetic properties of LSMO nanolayers by laser modulated reflectance probe

V. Pencheva; E. Alipieva; S. Penchev; I. Nedkov; T. Kutzarova

doi:10.1117/12.882111

17 January 2011 Investigation of ferromagnetic properties of LSMO nanolayers by laser modulated reflectance probe

V. Pencheva, E. Alipieva, S. Penchev, I. Nedkov, T. Kutzarova

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 La_2/3Sr_1/3MnO₃(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.

Citation Download Citation

V. Pencheva, E. Alipieva, S. Penchev, I. Nedkov, and 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); https://doi.org/10.1117/12.882111

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KEYWORDS

Modulation

Reflectivity

Laser beam diagnostics

Ferromagnetics

Sensors

Dielectrics

Helium neon lasers

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