Tuning the Structure, Magnetic, and High Frequency Properties of Sc-Doped Sr0.5Ba0.5ScxFe12-xO19/NiFe2O4 Hard/Soft Nanocomposites

The Sr0.5Ba0.5ScxFe12-xO19(SrBaSc)/NiFe2O4(NiFe) hard-soft nanocomposites (NCs) are synthesized by in situ sol-gel route. Impact of Sc3+ doping on their structure, morphology, and magnetic properties are examined. X-ray diffraction confirms the coexistence of SrBaSc and NiFe phases without any impurity. Morphology of NCs reveals a cluster of hexagonal plate decorated by spherical grains. Magnetic characteristics of the NCs are examined by using a vibration sample magnetometer at room temperature and 10 K. The x = 0.000 sample shows some kinks in their M-H loops and the occurrence of two peaks in dM/dH(H). All the NCs with Sc3+ exhibit smooth shapes of M-H curves with single peak, revealing the complete and perfect exchange coupling behavior. The diverse magnetic parameters at both temperatures are determined. The values of saturation and remanent magnetizations are decreasing with the Sc content increase. The intensive electromagnetic absorption is observed in all the samples. Reflection loss (RL) of more than -18 dB is observed above 3 GHz. Strong coupling between Sc concentration and amplitude-frequency characteristics of the RL can be used for developing of the functional media for high-frequency devices and will open broad perspectives for practical application in radar-absorbing technology and electromagnetic compatibility.

Automated summary

This study investigates the synthesis and magnetic properties of Sr0.5Ba0.5ScxFe12-xO19/NiFe2O4 hard-soft nanocomposites, revealing that samples with Sc3+ doping exhibit complete exchange coupling behavior, while the saturation and remanent magnetizations decrease with increasing Sc content. Strong electromagnetic absorption was observed in all samples, with potential applications in high-frequency devices and radar-absorbing technology.