The use of Lorentz microscopy for the determination of magnetic reversal mechanism of exchange-biased Co30Fe70-NiMn bilayer - Physics > Instrumentation and DetectorsReport as inadecuate




The use of Lorentz microscopy for the determination of magnetic reversal mechanism of exchange-biased Co30Fe70-NiMn bilayer - Physics > Instrumentation and Detectors - Download this document for free, or read online. Document in PDF available to download.

Abstract: Lorentz transmission electron microscopy LTEM combined with in-situmagnetizing experiments is a powerful tool for the investigation of themagnetization of the reversal process at the micron scale. We have implementedthis tool on a conventional transmission electron microscope TEM to study theexchange anisotropy of a polycrystalline Co35Fe65-NiMn bilayer.Semi-quantitative maps of the magnetic induction were obtained at differentfield values by the differential phase contrast DPC technique adapted for aTEM SIDPC. The hysteresis loop of the bilayer has been calculated from therelative intensity of magnetic maps. The curve shows the appearance of anexchange-bias field reveals with two distinct reversal modes of themagnetization: the first path corresponds to a reversal by wall propagationwhen the applied field is parallel to the anisotropy direction whereas thesecond is a reversal by coherent rotation of magnetic moments when the field isapplied antiparallel to unidirectional anisotropy direction.



Author: Aurélien Masseboeuf SP2M, Christophe Gatel SP2M, Pascale Bayle-Guillemaud SP2M, Yann Lamy LETI, Bernard Viala LETI

Source: https://arxiv.org/







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