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- W2074373247 abstract "Temperature variations (300–4 K) of the electron magnetic resonance (EMR) spectra of ferrihydrite (FeOOH·nH2O) nanoparticles of size ≃5 nm are reported at the frequencies of ν=190.62 and 285.93 GHz. The EMR line at 300 K, occurring near g≃2, broadens and shifts to lower fields with decreasing T for T>Ts=30K. For T<Ts, the trend reverses in that the line narrows and shifts to higher fields. In magnetic studies, the coercivity Hc is maximum at Ts (approaching zero at the blocking temperature TB≃65K) with the appearance of exchange bias HE for T<Ts. The magnetic viscosity is also maximum near Ts, approaching zero above TB. These observations lead to the suggestion that Ts represents a phase transition to a new magnetically ordered state, with spin-glass-like ordering of the uncompensated Fe3+ spins." @default.
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- W2074373247 date "2005-03-01" @default.
- W2074373247 modified "2023-09-24" @default.
- W2074373247 title "High-frequency electron magnetic resonance and magnetic studies of ferrihydrite nanoparticles and evidence of a phase transition" @default.
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- W2074373247 doi "https://doi.org/10.1016/j.jmmm.2004.09.003" @default.
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