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Superparamagnetic behaviour of Hf_{;57};Fe_{;43}; amorphous alloy


Pajić, Damir; Zadro, Krešo; Ristić, Ramir; Babić, Emil
Superparamagnetic behaviour of Hf_{;57};Fe_{;43}; amorphous alloy // International conference on magnetism 2006 - ABSTRACTS / Miyake, K. ; Kitaoka, Y. (ur.).
Kyoto: ICM 2006, 2006. str. 602-602 (poster, međunarodna recenzija, sažetak, znanstveni)


Naslov
Superparamagnetic behaviour of Hf_{;57};Fe_{;43}; amorphous alloy

Autori
Pajić, Damir ; Zadro, Krešo ; Ristić, Ramir ; Babić, Emil

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
International conference on magnetism 2006 - ABSTRACTS / Miyake, K. ; Kitaoka, Y. - Kyoto : ICM 2006, 2006, 602-602

Skup
International conference on magnetism 2006

Mjesto i datum
Kyoto, Japan, 20-25.08.2006

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
Hf-Fe; binary magnetic/nonmagnetic amorphous alloy; superparamagne tic relaxation; blocking temperature

Sažetak
In Hf_{;100-x};Fe_{;x}; amorphous system the stablishing of long range magnetic order depends on the iron concentration. For the investigated Hf_{;57};Fe_{;43}; alloy this concentration is just below the threshold for long range ordering. Therefore, the magnetic clusters of iron with relatively high magnetic moments formed in nonmagnetic matrix are expected. Their behaviour shows to be superparamagnetic. Detailed measurements including magnetic hysteresis loops, dependence of magnetic moment on temperature and the relaxation of magnetization are performed. The splitting between zero-field cooled and field cooled magnetic moment curves points to the blocking of magnetic moment of the clusters. This is the origin of hysteresis loops below the blocking temperature. Slow relaxation of magnetic moment is logarithmic, which indicates that the moments relax over the distributed barriers. Using the model of thermal relaxation it is found that the average size of magnetic clusters is approximately 10nm.

Izvorni jezik
Engleski

Znanstvena područja
Fizika



POVEZANOST RADA


Projekt / tema
0119258
0119260

Ustanove
Prirodoslovno-matematički fakultet, Zagreb