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Magnetic Memory Effects in rmFe / gamma hbox - rmFe 2 rmO bf 3 Nanostructures
Ist Teil von
IEEE transactions on magnetics, 2014-03, Vol.50 (3), p.11-17
Erscheinungsjahr
2014
Link zum Volltext
Quelle
IEL
Beschreibungen/Notizen
We report an unusual consequence of magnetic memory effect in rmFe / gamma hbox - rmFe 2 rmO 3 nanostructures, which is prepared using an electrochemical route. Chemical phases of rmFe / gamma hbox - rmFe 2 rmO 3 nanostructures are characterized by X-ray diffraction, optical, and Mossbauer spectroscopic studies. The static and dynamic aspects of dc magnetization studies are carried out. Thermal variation of zero-field-cooled (ZFC) magnetization displays a signature of blocking temperature openbracket rmT rmB [ closebracket ] at 215 K. Another broadened peak is also evident in the field-cooled (FC) magnetization at 40 K openbracket rmT rmG [ closebracket ] . Signature of memory effect is observed below TG after cooling the sample both in ZFC and FC protocols. Appearance of memory effect in the ZFC protocol confirms spin-glass-like state below rmT rmG . Interestingly, memory effect is absent below rmT rmB even in FC protocol, although a large particle size distribution is noticed in the rmFe / gamma hbox - rmFe 2 rmO 3 nanostructures. The results address the fundamental question whether substantial particle size distribution is sufficient enough for the memory effect in the FC protocol as found in the literatures.