The magnetic properties of a polycrystalline Sr3NiIrO6 sample have been investigated by means of susceptibility and magnetization measurements. On the one hand, it is found that this compound, made of magnetic chains on a triangular lattice, behaves very similarly to Ca3CoRhO6 and Ca3CoIrO6. In particular, at low temperature (T
We report experimental studies and suggest a quantitative model of spin relaxation in Mn 12 acetate in a pulsed magnetic field in the temperature range 1.9-5.0 K. When the field applied along the anisotropy axis is swept at 140 T/s through a nonmagnetized Mn 12 acetate sample, the sample's magnetization switches, within a few milliseconds, from zero to saturation at a well-defined field whose value depends on temperature but is quantized in units of 0.46 T. A quantitative explanation of the effect is given in terms of a spin-phonon avalanche combined with thermally assisted resonant spin tunneling. ͓S0163-1829͑99͒11529-7͔
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