Magneto-optics applied to the analysis of magnetization processes in amorphorus ferri/ferro magnetic bilayers

We study the magnetization processes in the amorphous ferri—ferro magnetic bilayer of GdCo 2/YCo 2 by means of the transverse magneto-optic Kerr effect (MOKE). The cycles M cos θ − M sin θ (θ refers to the angle between the magnetization M and the applied field H) indicate that the irreversible magn...

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Bibliographic Details
Published in:Journal of magnetism and magnetic materials 1995-07, Vol.148 (1), p.260-261
Main Authors: Alameda, J.M., Salas, F.H., Pérez, G.T., Alvarez-Prado, L.M., Morales, R.
Format: Article
Language:English
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Summary:We study the magnetization processes in the amorphous ferri—ferro magnetic bilayer of GdCo 2/YCo 2 by means of the transverse magneto-optic Kerr effect (MOKE). The cycles M cos θ − M sin θ (θ refers to the angle between the magnetization M and the applied field H) indicate that the irreversible magnetization processes arising at both the coercivity and the transition field do not occur by a coherent-rotation mechanism. MOKE allows one to follow the creation and the extinction of Bloch walls in the bilayer as a function of the applied field. First-order magnetization processes are observed in this macroscopic ferrimagnet when H is applied perpendicularly to the in-plane easy axis of uniaxial anisotropy. In fact, sharp transitions in the magnetic-moment structure are observed at H = 8.5 Oe and H = 17 Oe.
ISSN:0304-8853
DOI:10.1016/0304-8853(95)00228-6