Influence of zinc and cadmium co-doping on optical and magnetic properties of cobalt ferrites |
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Affiliation: | 1. Physics Department, Dadi Institute of Engineering & Technology, Anakapalli 531002, A.P, India;2. Physics Department, Andhra University, Visakhapatnam 530003, A.P, India;3. Physics Department, PBN College, Nidubrolu 522124, A.P, India;4. Department of Electronics and Physics, Institute of Science, GITAM (Deemed to be University), Visakhapatnam 530045, A.P, India;5. Physics Department, IIIT, RGUKT, Nuzividu 521 202, A.P, India;1. Department of Physics, Government College University Faisalabad, Pakistan;2. College of Arts and Science, Abu Dhabi University, Abu Dhabi, United Arab Emirates;3. Department of Physics, University of Education Lahore, Faisalabad Campus, Pakistan |
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Abstract: | Zinc and cadmium based cobalt ferrites ZnxCd0.375-xCo0.625Fe2O4 (where x = 0, 0.075, 0.125, 0.25) were successfully synthesized by a facile co-precipitation technique. Structural, optical and magnetic characteristics of the doped ferrites were systematically analyzed. X-ray Diffraction (XRD) pattern confirmed the formation of cubic spinel structure in all samples. Scanning electron microscopic analysis of surface morphology revealed cubic and spherical shaped ferrite particles. Fourier transform infrared (FTIR) spectroscopy confirmed the existence of metal oxygen (M − O) bonding in the prepared samples. Moreover, the prepared samples exhibited two frequency bands corresponding to phonon vibrational stretching in both octahedral and tetrahedral lattice positions. The optical properties were investigated in detail through photoluminescence (PL) spectroscopy and Raman spectroscopy. The PL spectrum confirmed the strong emission peaks in the ultraviolet to visible region of all the samples. Further, four active Raman modes, associated with cubic spinel structure are identified in all prepared samples. Finally, the magnetic characteristics are evaluated by using vibrating sample magnetometer (VSM) revealing ferrimagnetic and soft magnetic behavior of the samples. As the Zn and Cd co-doping in Co was increased, the Hc was decreased. The magnetic studies show the maximum Hc of 576 Oe for Cd doped cobalt ferrite, and maximum saturation magnetization (Ms) for Zn–Cd doped cobalt ferrite. It is envisaged that the newly prepared Zn–Cd co-doped cobalt ferrite would be appropriate for a number of important applications, for example, magnetic recording devices, sensors, actuators, high-density data storage devices, and biomedical equipments. |
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Keywords: | Magnetic particles Lattice sites Raman modes Phonon vibrations Ferrimagnetic Vibrating sample magnetometer |
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