Hysteresis of ultrasmall Fe–Pt particles

Hysteresis of ultrasmall Fe–Pt particles

Fabrication and nanostructure of oriented FePt particles

Thin films of oriented tetragonal FePt particles separated by amorphous alumina have been fabricated by electron beam evaporation. The ordering of the FePt particles without coarsening can be tailored by annealing conditions. The value of coercivity of the annealed film reached as high as 4.4 kOe. The perpendicular magnetic coercivity of the annealed film was slightly larger than in-plane coerc...

Sorption hysteresis of benzene in charcoal particles.

Charcoal is found in water, soil, and sediment where it may act as a sorbent of organic pollutants. The sorption of organic compounds to natural solids often shows hysteresis. The purpose of this study was to determine the source of pronounced hysteresis that we found in the sorption of a hydrophobic compound (benzene) in water to a maple-wood charcoal prepared by oxygen-limited pyrolysis at 67...

HYSTERESIS MEASUREMENTS ON RCo5 MICRO-PARTICLES

Magnetic hysteresis loops measured on isolated single particles of a few microns size are shown for RCos compounds with R = Sm, Pr and La, respectively. The critical fields at which walls nucleate and propagate are measured separately, and the influence of ageing is observed. Pinning of domain walls seems to be significant in determining the coercive force. The magnetization process of RCO, com...

Effects of surface anisotropy on hysteresis in fine magnetic particles.

We solve numerically the dissipative Landau-LifshitzGilbert equations to consider hysteresis in fine magnetic particles. Finite size effects are studied for two models with uniaxial anisotropy — bulk random axis and surface anisotropy only. It is demonstrated that the latter model introduces considerable effects for small enough particles when the coupling to the anisotropy is equal or greater ...