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.
Complete list of metadatas

Cited literature [19 references]  Display  Hide  Download

https://hal.archives-ouvertes.fr/hal-00403959
Contributor : Aurélien Masseboeuf <>
Submitted on : Wednesday, July 15, 2009 - 10:41:15 AM
Last modification on : Thursday, March 7, 2019 - 5:00:02 PM
Long-term archiving on : Tuesday, June 15, 2010 - 8:02:09 PM

Files

JMMM.pdf
Files produced by the author(s)

Identifiers

Collections

Citation

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⟩

Share

Metrics

Record views

251

Files downloads

247