ACTA

Magnetism of Nanoparticle La_0.7Ca_0.3Mn_0.7Fe_0.3O₃ under Applied Hydrostatic Pressure

V. Kusigerski^a, M. Perovic^a, A. Mrakovic^a, J. Blanusa^a, M. Mihalik^b, M. Zentkova^b and V. Spasojevic^a
^aCondensed Matter Physics Laboratory, Vinca Institute, University of Belgrade, POB 522, 11001 Belgrade, Serbia
^bInstitute of Experimental Physics, Slovak Academy of Sciences, 04001 Kosice, Slovak Republic

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Nanoparticle La_0.7Ca_0.3Mn_0.7Fe_0.3O₃ with the average particle size of 10 nm was mechanochemically synthesized in the single-step procedure. Temperature and field dependences of magnetization were recorded under both ambient and applied hydrostatic pressure up to 0.47 GPa. At ambient pressure, two magnetic transition points were observed: one of the spin-glass like type at the temperature T_f ≈ 34 K, and ferro-to-paramagnet transition at T_C ≈ 51 K. Under the applied pressure magnetic parameters gradually changed: (i) both T_C and T_f were lowered with the increase in pressure; (ii) both high field magnetization M_5T and remanent magnetization M_Rem decreased with pressure; (iii) coercivity H_C increased with pressure. The obtained results show that magnetism of a nanoparticle system with high degree of intrinsic disorder diminishes with the applied pressure that is in compliance with the effect of the increased cationic disorder ("internal pressure") in bulk manganites.

DOI: 10.12693/APhysPolA.118.811
PACS numbers: 75.50.Tt, 75.75.-c, 81.07.Bc