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Pregled bibliografske jedinice broj: 301852

Thermal relaxation of magnetic clusters in amorphous Hf57Fe43 alloy


Pajić, Damir; Zadro, Krešo; Ristić, Ramir; Živković, Ivica; Skoko, Željko; Babić, Emil
Thermal relaxation of magnetic clusters in amorphous Hf57Fe43 alloy // Journal of Physics: Condensed Matter, 19 (2007), 29; 296207-296216 (međunarodna recenzija, članak, znanstveni)


Naslov
Thermal relaxation of magnetic clusters in amorphous Hf57Fe43 alloy

Autori
Pajić, Damir ; Zadro, Krešo ; Ristić, Ramir ; Živković, Ivica ; Skoko, Željko ; Babić, Emil

Izvornik
Journal of Physics: Condensed Matter (0953-8984) 19 (2007), 29; 296207-296216

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
Magnetic nano clusters; thermal relaxation of magnetization; blocking of magnetic moment; magnetic anisotropy; amorphous alloy; Hf-Fe

Sažetak
The magnetization processes in binary magnetic/non-magnetic amorphous alloy Hf57Fe43 are investigated by the detailed measurement of magnetic hysteresis loops, temperature dependence of magnetization, relaxation of magnetization and magnetic ac susceptibility, including a nonlinear term. Blocking of magnetic moments at lower temperatures is accompanied by the slow relaxation of magnetization and magnetic hysteresis loops. All of the observed properties are explained by the superparamagnetic behaviour of the single domain magnetic clusters inside the non-magnetic host, their blocking by the anisotropy barriers and thermal fluctuation over the barriers accompanied by relaxation of magnetization. From magnetic viscosity analysis based on thermal relaxation over the anisotropy barriers it is found that magnetic clusters occupy the characteristic volume from 25 up to 200 nm3. The validity of the superparamagnetic model of Hf57Fe43 is based on the concentration of iron in the Hf100− xFex system that is just below the threshold for long range magnetic ordering. This work also throws more light on the magnetic behaviour of other amorphous alloys.

Izvorni jezik
Engleski

Znanstvena područja
Fizika



POVEZANOST RADA


Projekt / tema
035-0352843-2845 - Kvantni magneti: Osnovna stanja u kompeticiji (Mladen Prester, )
119-0982886-1009 - Struktura i svojstva posebnih nanomaterijala dobivenih suvremenim tehnikama (Antun Tonejc, )
119-1191458-1017 - Nanomagneti (Krešo Zadro, )
119-1191458-1019 - Elektromagnetska svojstva nanostrukturiranih materijala (Emil Babić, )

Ustanove
Institut za fiziku, Zagreb,
Prirodoslovno-matematički fakultet, Zagreb,
Filozofski fakultet, Osijek

Časopis indeksira:


  • Current Contents Connect (CCC)
  • Web of Science Core Collection (WoSCC)
    • Science Citation Index Expanded (SCI-EXP)
    • SCI-EXP, SSCI i/ili A&HCI
  • Scopus


Uključenost u ostale bibliografske baze podataka:


  • Chemical Abstracts
  • The INSPEC Science Abstracts series
  • Engineering Index/Ei Compendex&reg
  • Cambridge Scientific Abstracts (Engineered Materials Abstracts
  • Metals Abstracts
  • Aluminium Industry Abstracts)