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Atomic force microscopy of nanostructured multicomponent alloys (Tb,Dy,Gd)Co2
Russian version
Tereshina I.S.1, Kaminskaya T. P.1, Aleroev A. A.1,2, Karpenkov A. Yu.3
1Lomonosov Moscow State University, Moscow, Russia
2Grozny State Oil Technical University. Grozny, Russia
3Tver State University, Tver, Russia
Email: irina_tereshina@mail.ru
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The nanostructured state of multicomponent (Tb,Dy,Gd)Co2 alloys was studied using atomic force microscopy. Ribbon-shaped samples with a distinct directional structure were obtained by rapid melt crystallization on a rotating copper disk. Ribbon cleavages, as well as the contact and free surfaces of the ribbon samples, were examined. The features of the topography, structure, defects on both surfaces, and the morphology of nanograins were determined for two rapidly quenched samples of different compositions: Tb0.2Dy0.5Gd0.3Co2 and Tb0.8Dy0.1Gd0.1Co2. Using the atomic force microscopy results, the increase in magnetostrictive properties of the rapidly quenched samples compared to the original ones was interpreted. It was noted that the high performance of the alloys is due to the volume effect (associated with the dependence of the exchange integrals on the unit cell volume). Keywords: Rare earth intermetallics, Laves phases, rapid quenching, nanostructured state, nanograins, atomic force microscopy, magnetostriction, volumetric effect.
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