Magnetization and AC susceptibility measurements have been performed on ~3 nm NiO nanoparticles in powder form. The results indicate that the structure of the particles can be considered as consisting of an antiferromagnetically ordered core, with an uncompensated magnetic moment, and a magnetically disordered surface shell. The core magnetic moments block progressively with decreasing temperature, according to the distribution of their anisotropy energy barriers, as shown by a broad maximum of the low field zero-field-cooled magnetization (MZFC) and in the in-phase component χ' of the AC susceptibility, centred at ~70 K. On the other hand, surface spins thermally fluctuate and freeze in a disordered spin-glass-like state at much lower temperature, as shown by a peak in MZFC (at 17 K, for H = 50 Oe) and in χ'. The temperature of the high temperature χ' peak changes with frequency according to the Arrhenius law; instead, for the low temperature maximum a power law dependence of the relaxation time was found, τ = τ0(Tg/(T(ν)−Tg))α, where α = 8, like in spin glasses, τ0 = 10−12 s and Tg = 15.9 K. The low temperature surface spin freezing is accompanied by a strong enhancement of magnetic anisotropy, as shown by the rapid increase of coercivity and high field susceptibility. Monte Carlo simulations for core/shell antiferromagnetic particles, with an antiferromagnetic core and a disordered shell, reproduce the qualitative behaviour of the temperature dependence of the coercivity. Interparticle interactions lead to a shift to a high temperature of the distribution of the core moment blocking temperature and to a reduction of magnetization dynamics.

SURFACE SPIN-GLASS FREEZING IN INTERACTING CORE–SHELL NiO NANOPARTICLES / Winkler, E.; Zysler, R. D.; VASQUEZ MANSILLA, M.; Fiorani, D.; Rinaldi, D.; Vasilakaki, M.; Trohidou, K. N.. - In: NANOTECHNOLOGY. - ISSN 0957-4484. - STAMPA. - 19:(2008), p. 185702. [10.1088/0957-4484/19/18/185702]

SURFACE SPIN-GLASS FREEZING IN INTERACTING CORE–SHELL NiO NANOPARTICLES

D. RINALDI;
2008-01-01

Abstract

Magnetization and AC susceptibility measurements have been performed on ~3 nm NiO nanoparticles in powder form. The results indicate that the structure of the particles can be considered as consisting of an antiferromagnetically ordered core, with an uncompensated magnetic moment, and a magnetically disordered surface shell. The core magnetic moments block progressively with decreasing temperature, according to the distribution of their anisotropy energy barriers, as shown by a broad maximum of the low field zero-field-cooled magnetization (MZFC) and in the in-phase component χ' of the AC susceptibility, centred at ~70 K. On the other hand, surface spins thermally fluctuate and freeze in a disordered spin-glass-like state at much lower temperature, as shown by a peak in MZFC (at 17 K, for H = 50 Oe) and in χ'. The temperature of the high temperature χ' peak changes with frequency according to the Arrhenius law; instead, for the low temperature maximum a power law dependence of the relaxation time was found, τ = τ0(Tg/(T(ν)−Tg))α, where α = 8, like in spin glasses, τ0 = 10−12 s and Tg = 15.9 K. The low temperature surface spin freezing is accompanied by a strong enhancement of magnetic anisotropy, as shown by the rapid increase of coercivity and high field susceptibility. Monte Carlo simulations for core/shell antiferromagnetic particles, with an antiferromagnetic core and a disordered shell, reproduce the qualitative behaviour of the temperature dependence of the coercivity. Interparticle interactions lead to a shift to a high temperature of the distribution of the core moment blocking temperature and to a reduction of magnetization dynamics.
2008
File in questo prodotto:
Non ci sono file associati a questo prodotto.

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11566/38529
 Attenzione

Attenzione! I dati visualizzati non sono stati sottoposti a validazione da parte dell'ateneo

Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 154
  • ???jsp.display-item.citation.isi??? 144
social impact