Magnetism of AuFe nanoparticles
作者： T. Taniyama , R. Ogawa , T. Sato , E. Ohta
DOI: 10.1016/S0921-5093(96)10329-4
关键词: Thermodynamic equilibrium 、 Superparamagnetism 、 Magnetic structure 、 Condensed matter physics 、 Magnetism 、 Nanostructure 、 Materials science 、 Nanoparticle 、 Magnetization 、 Phase (matter)
摘要: Abstract The time-dependent magnetization of Au 81.7 Fe 18.3 nanoparticles was investigated under field-cooled and zero-field-cooled conditions. In the a spin-glass-like phase appears below 10 K; magnetizations reach upper bound value within about 1500 s. This is first observation entire process evolution from non-equilibrium state to equilibrium state. peculiar relaxation in may be interpreted by decrease characteristic time owing simplification multi-valley structure free energy and/or lowered barrier as surface effect.
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