论文信息 - Interplay of uniform and random anisotropy in nanocrystalline soft magnetic alloys

Interplay of uniform and random anisotropy in nanocrystalline soft magnetic alloys

The magnetization process in nanocrystalline Fe73Cu1Nb3Si16B7 ribbons with different magnitudes of a magnetic field induced transverse anisotropy was investigated by Kerr-microscopy and magnetic hysteresis measurements at room temperature and elevated temperatures. Comparing samples with strong (Ku 30 J/m 3 ) and weak (Ku 3 J/m 3 ) induced anisotropy Ku, we find significant differences in the magnetic microstructure, reflecting the interplay of the uniform, field induced and the random magnetocrystalline anisotropy. In particular for weak Ku, we find irregular magnetization patches within the wide regular domains connected to the induced anisotropy. These magnetization patches are fluctuating on the scale of a few micrometers and are interpreted in terms of the random anisotropy.

[1] A. N. Bogdanov,et al. Magnetic Domains. The Analysis of Magnetic Microstructures , 1999 .

[2] G. Herzer,et al. Grain structure and magnetism of nanocrystalline ferromagnets , 1989, International Magnetics Conference.

[3] Y. Yoshizawa,et al. New Fe-based soft magnetic alloys composed of ultrafine grain structure , 1988 .

[4] P. Švec,et al. Properties and Applications of nanocrystalline alloys from amorphous precursors , 2005 .

[5] Mely Chen Chi,et al. Random anisotropy in amorphous ferromagnets , 1978 .

[6] J. Petzold,et al. Advantages of softmagnetic nanocrystalline materials for modern electronic applications , 2002 .

[7] G. Herzer,et al. AMORPHOUS AND NANOCRYSTALLINE SOFT MAGNETS , 1997 .

[8] G. Herzer. The Random Anisotropy Model , 2005 .

[9] A. Hubert,et al. Enhancement of magneto-optical domain observation by digital image processing , 1985 .

[10] G. Herzer,et al. NANOCRYSTALLINE SOFT MAGNETIC ALLOYS , 2002 .

[11] G. Herzer,et al. Grain size dependence of coercivity and permeability in nanocrystalline ferromagnets , 1990, International Conference on Magnetics.

[12] G. Herzer,et al. Domain observation on nanocrystalline material , 1991 .

[13] J. Cadogan,et al. The effect of coherent uniaxial anisotropies on the grain-size dependence of coercivity in nanocrystalline soft magnetic alloys , 1998 .