Magnetic properties of (SrFe₁₂O₁₉)_x(CaCu₃Ti₄O₁₂)_1-x composites
Eremina R.M., Sharipov K.R., Yatsyk I.V., Lyadov N.M., Gilmutdinov I.F., Kiiamov A.G., Kabirov Yu.V., Gavrilyachenko V.G., Chupakhlina T.I.

Received: December 27, 2015

DOI: 10.7868/S0044451016070130

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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 micro inclusions in the (SrFe₁₂O₁₉)_0.05(CaCu₃Ti₄O₁₂)_0.95 composite ``magnetize'' CaCu<sub>3</sub>Ti<sub>4</sub>O<sub>12</sub> at temperatures from 300 to 200 K, forming a ferrimagnetic particle near the SrFe<sub>12</sub>O<sub>19</sub> ``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.