Correlation exchange length in nanocrystalline soft magnetic materials characterized by electron holography

摘要

Magnetic ripple structure of Fe_(84)Nb_7B_9 is studied by electron holography. The correlation exchange length, effective exchange and anisotropy constants are estimated from a field dependence of ripple wavelength. The function of ripple theory is adjusted with a decay constant, which reflects influence of stray field on the ripple structure. A magnetic hardness at elevated temperature is also observed and analyzed.