Magnetic properties of (SrFe12O19)x(CaCu3Ti4O12)1–x composites

Abstract

New composite materials (SrFe₁₂O₁₉)_x(CaCu₃Ti₄O₁₂)_1–x (x = 0, 0.05, 1) have been synthesized. Their magnetic properties are studied in the temperature range 5–300 K using the magnetic resonance and magnetometry methods. It is found that strontium hexaferrite microinclusions in the (SrFe₁₂O₁₉)_0.05(CaCu₃Ti₄O₁₂)_0.95 composite “magnetize” CaCu₃Ti₄O₁₂ at temperatures from 300 to 200 K, forming a ferrimagnetic particle near the SrFe₁₂O₁₉ “core.” The magnetic resonance line below 200 K splits into two lines corresponding to SrFe₁₂O₁₉ and CaCu₃Ti₄O₁₂. The core effect decoration is manifested in the increase in the Curie–Weiss temperature from 25 K in CaCu₃Ti₄O₁₂ without the doping ceramics to 80 K in the composite with 5% of SrFe₁₂O₁₉.