Mossbauer study of magnetic interactions in nanocrystalline Fe<sub>73.5</sub>Cu<sub>1</sub>Nb<sub>3</sub>Si<sub>16.5</sub>B<sub>6</sub>
Ajay Gupta; Neeru Bhagat; G Principi; Ajay Gupta; Sch. of Phys., Devi Ahilya Univ., Indore, India; Neeru Bhagat; Sch. of Phys., Devi Ahilya Univ., Indore, India; G Principi; Sch. of Phys., Devi Ahilya Univ., Indore, India
Журнал:
Journal of Physics: Condensed Matter
Дата:
1995-03-06
Аннотация:
Mossbauer spectroscopy has been used to follow the temperature-dependent magnetization in the temperature range 4.2-823 K of the amorphous as well as the nanocrystalline grains in partially crystallized Fe<sub>73.5</sub>Cu<sub>1</sub>Nb<sub>3</sub>Si<sub>16.5</sub>B<sub>6</sub> alloy. In nanocrystallized specimens, the magnetization behaviour of both amorphous and nanocrystalline components is significantly different from that of the bulk amorphous or crystalline Fe<sub>3</sub>Si. Initially the nanocrystalline grains exhibit a superparamagnetic behaviour above the Curie temperature of the amorphous matrix. With increasing density of nanocrystalline grains, the superferromagnetic interaction between the grains becomes important.
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