Abstract
Nanostructured Srn-Co, Sm-Co-C;u, Sm-Co-Ni thin films have been obtained by crystallizing the as-deposited amorphous films which were sputtered onto Cr buffer layers. Room temperature coercivity increases from less than 100 Oe in the amorphous state up to 42 kOe in a SmCo 2Cu 3 Sample annealed 30 min. at 550 °C. Initial magnetization curves showed a behavior characteristic of uniform domain wall pining. Magnetic viscosity measurements indicated that the switching volume is of the same order as the Sm(Co,Cu) 5 crystallites size. Remanence Measuremcnts showed that interparticulate interactions were magnetizing and rather independent of the crystallization static. These data pointed to domain wall pinning at the high anisotropy Sm-C′.o precipitatcs as the origin of the huge coercivity in the annealed films.
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