In situ Lorentz microscopy and electron holography in magnetic nanostructures

Abstract : In this thesis, we have developed quantitative and qualitative studies of the magnetic states of different magnetic nanostructures by in situ Lorentz Microscopy (LM) and Electron Holography (EH) experiments under application of magnetic field or working at low temperature (100 K), on three different magnetic nanostructures: L-shape Co and Co50Fe50 nanowires, Co antidot arrays and strained La2/3Ca1/3MnO3. DW manipulation experiments by magnetic field allowed characterize process such as DW nucleation, propagation, pinning and depinning in the nanowires. By in situ LM, remanent magnetic states and reversal magnetization process in high-density antidot arrays were studied. Finally, the effect of the substrate-induced strain in LCMO thin film were studied by EH at 100 K. We found that such strain effect produce a magnetic phase separation and/or variation in the magnetocrystalline anisotropy.
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Luis Alfredo Rodríguez González. In situ Lorentz microscopy and electron holography in magnetic nanostructures. Materials Science [cond-mat.mtrl-sci]. Université Toulouse III Paul Sabatier (UT3 Paul Sabatier); Universidad de Zaragoza, 2014. English. ⟨NNT : 2014TOU30228⟩. ⟨tel-01789430⟩

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