The use of Lorentz microscopy for the determination of magnetic reversal mechanism of exchange-biased Co30Fe70/NiMn bilayer

Abstract : Lorentz transmission electron microscopy (LTEM) combined with in-situ magnetizing experiments is a powerful tool for the investigation of the magnetization of the reversal process at the micron scale. We have implemented this tool on a conventional transmission electron microscope (TEM) to study the exchange anisotropy of a polycrystalline Co35Fe65/NiMn bilayer. Semi-quantitative maps of the magnetic induction were obtained at different field values by the differential phase contrast (DPC) technique adapted for a TEM (SIDPC). The hysteresis loop of the bilayer has been calculated from the relative intensity of magnetic maps. The curve shows the appearance of an exchange-bias field reveals with two distinct reversal modes of the magnetization: the first path corresponds to a reversal by wall propagation when the applied field is parallel to the anisotropy direction whereas the second is a reversal by coherent rotation of magnetic moments when the field is applied antiparallel to unidirectional anisotropy direction.
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Journal of Magnetism and Magnetic Materials, Elsevier, 2009, 321, pp.3080-3083. 〈10.1016/j.jmmm.2009.05.011〉
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Aurélien Masseboeuf, Christophe Gatel, Pascale Bayle-Guillemaud, Yann Lamy, Bernard Viala. The use of Lorentz microscopy for the determination of magnetic reversal mechanism of exchange-biased Co30Fe70/NiMn bilayer. Journal of Magnetism and Magnetic Materials, Elsevier, 2009, 321, pp.3080-3083. 〈10.1016/j.jmmm.2009.05.011〉. 〈hal-00403959〉

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