Structure and magnetic properties of chromium doped cobalt molybdenum nitrides

• A new chromium doped mixed Co-Mn-N nanocomposites were synthesized.
• Surface ferromagnetism was detected in a wide temperature range.
• Core-shell model was applied to explain nanocomposites magnetism.

Four nanocomposites containing mixed phases of Co3Mo3N and Co2Mo3N doped with chromium have been prepared. A linear fit is found for relation between Co2Mo3N and chromium concentrations. The magnetization in ZFC and FC modes at different temperatures (2–300 K) and in applied magnetic fields (up to 70 kOe) have been investigated. It has been detected that many magnetic characteristics of the studied four nanocomposites correlate not with the chromium concentration but with nanocrystallite sizes. The obtained results were interpreted in terms of magnetic core-shell model of a nanoparticle involving paramagnetic core with two magnetic sublattices and a ferromagnetic shell related to chromium doping.

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