Investigation on the structural, magnetic, microwave absorption properties, and shielding effectiveness in the K_u frequency band of pristine and Dy³⁺ doped Stannous ferrite nanoparticles

Undoped and 5% dysprosium (Dy)-doped stannous ferrite nanoparticles have been synthesized by sol-gel method. X-Ray diffraction patterns confirm successful doping of Dy3+ ions in stannous ferrite. The different structural parameters, viz., oxygen positional parameter, bond lengths, bond angles, etc., are calculated from the cationic distribution in the tetrahedral and octahedral sites. Magnetic studies indicate a considerable enhancement in magnetization and blocking temperature due to the inclusion of Dy3+ ions in the octahedral sites of stannous ferrite. Room temperature M-H loop data suggest soft ferromagnetic nature enhances due to incorporation of the Dy3+ ion. The maximum shielding effectiveness is found to be 19.1 dB at 14.76 GHz for undoped stannous ferrite (SF1) and 18.01 dB at 14.06 GHz for Dy3+-doped stannous ferrite (SF2). Over a wide range in the K-u frequency band, the values of reflection loss for both the samples are less than - 10 dB/m, suggesting that they are good microwave absorbers. The good EMI shielding, along with fair magnetic properties and microwave absorption properties, will be fruitful in industrial applications.