Abstract
The spin distribution in plastically deformed Fe - Al intermetallic compounds with the compositions of 30 and 35 at.% Al has been studied by Mössbauer spectroscopy and magnetization measurements with high magnetic field. Ferromagnetic clusters along the antiphase boundary (APB) between superpartial dislocations exist even below the freezing temperature and has a strong uniaxial anisotropy. The anisotropy is so strong that the magnetization does not saturate at 4.2 K even with an applied field of . The ferromagnetic APB ribbon enhances the neighbouring Fe moments and changes them to the ferromagnetic state. The magnitude of magnetic moments in the APB ribbon is and that of the neighbouring Fe atoms decreases with the distance from the ferromagnetic APB ribbon. The experimental results support our model as the origin of the spin glass in Fe - Al compounds; the paramagnetic state changes to the spin glass under the competition of two clusters with different directions of easy magnetization below the freezing temperature.
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