Marwa Ijaz, Majid Niaz Akhtar, Asif Jamil, Marcus Vinicius Castegnaro, Imran Shakir, Fatimah M. A. Alzahrani, Maira Younas, Sami Ullah, Shagufta Gulbadan, M.S. Al-Buriahi, Muhammad Azhar Khan
Currently, it is challenging to design meta-absorbers for the high-frequency range that exhibit enhanced absorption and dissipation. Electromagnetic pollution, caused by the increase in high-frequency waves from electronic devices, has had a significant impact on people and other living organisms. Crucial to solving the problems is the synthesis of ferrite and the design of meta-absorbers based on it. Sm3+ doped Sr4Ni2 U-type hexaferrite, Sr4Ni2SmxFe36−xO60, within the range of (0.0 ≤ x ≤ 0.075), was synthesized using the sol-gel auto-combustion method. XRD evidence validates the crystal structure of the U phase in hexaferrite. FTIR spectra demonstrate the presence of the ferrite phase, while the force constant and molecular bond lengths diminish with Sm3+. Raman analysis verifies the presence of Raman-active vibrations at 419.73, 479.51, 536.60, 625.69, and 688.30 cm− 1, respectively. UV-Vis analysis confirms an increase in the optical band gap from 2.15 eV to 2.46 eV with elevated Sm3+ concentrations. Dielectric losses increased with frequency from 1 to 3.5 GHz, then reduced from 3.5 GHz to 5.5 GHz. The meta-absorbers were designed and simulated. The TE mode of Sm3+-doped samples at varying concentrations exhibited an enhancement with increasing frequency. Absorptivity decreases as the angle of incidence increases. Doped Sm-Sr ferrites with a U-type hexagonal structure are useful for high-frequency applications in nanodevice stealth technology and for electromagnetic interference shielding. © The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature 2026.
Institute of Physics, The Islamia University of Bahawalpur, Bahawalpur, 63100, Pakistan; Mechanical and Industrial Engineering Department, Engineering Faculty, Universitas Negeri Malang, Malang, 65145, Indonesia; Institute of Physics, Federal University of Rio Grande do Sul (UFRGS), Rio Grande do Sul, Porto Alegre, Brazil; Department of Physics, Faculty of Science, Islamic University of Madinah, Madinah, Saudi Arabia; Department of Chemistry, College of Science, Princess Nourah bint Abdulrahman University, P.O. Box 84428, Riyadh, 11671, Saudi Arabia; Department of Chemistry, College of Science, King Khalid University, Abha, 61421, Saudi Arabia; Department of Physics, Sakarya University, Sakarya, Turkey; Research Center for Advanced Materials Science (RCAMS), King Khalid University, 9004, 61413, Abha, Saudi Arabia
