Magnetic Properties of the DyMn2O5–Mn3O4 Nanoparticle Composite

The magnetic and resonance properties of the DyMn 2 O 5 –Mn 3 O 4 nanoparticle composite have been experimentally investigated. Two magnetic transitions at temperatures of T 1 ≈ 65 K and T 2 ≈ 230 K have been established; the T 1 value differs from the temperatures of the transitions in the initial materials, which has been attributed to the interparticle interactions. Temperature T 2 corresponds to the DyMnO 3 impurity phase (1 at %). Three microwave absorption peaks have been observed in the magnetic resonance spectrum, which is explained within the model of a magnetically two-phase system. One resonance is attributed to Mn 3 O 4 , and the other two peaks are attributed to an ensemble of highly anisotropic DyMn 2 O 5 particles with a random distribution of anisotropy axes.