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Size Dependent Magnetic Properties And Cation Inversion In Chemically Synthesized Mnfe₂O₄ Nanoparticles, C. N. Chinnasamy, Aria Yang, S. D. Yoon, Kailin Hsu, M. D. Shultz, E. E. Carpenter, S. Mukerjee, C. Vittoria, V. G. Harris
Size Dependent Magnetic Properties And Cation Inversion In Chemically Synthesized Mnfe₂O₄ Nanoparticles, C. N. Chinnasamy, Aria Yang, S. D. Yoon, Kailin Hsu, M. D. Shultz, E. E. Carpenter, S. Mukerjee, C. Vittoria, V. G. Harris
Vincent G. Harris
MnFe₂O₄ nanoparticles with diameters ranging from about 4 to 50 nm were synthesized using a modified coprecipitation method. X-ray diffractograms revealed a pure phase spinel ferrite structure for all samples. Transmission electron microscopy showed that the particles consist of a mixture of both spherical (smaller) and cubic (larger) particles dictated by the reaction kinetics. The Néel temperatures (TN) of MnFe₂O₄ for various particle sizes were determined by using high temperature magnetometry. The ∽4 nm MnFe₂O₄ particles showed a TN of about 320°C whereas the ∽50 nm particles had a TN of about 400°C. The high Neel temperature, compared with the …
Effect Of Growth Temperature On The Magnetic, Microwave, And Cation Inversion Properties On Nife₂O₄ Thin Films Deposited By Pulsed Laser Ablation Deposition, C. N. Chinnasamy, S. D. Yoon, Aria Yang, Ashish Baraskar, C. Vittoria, V. G. Harris
Effect Of Growth Temperature On The Magnetic, Microwave, And Cation Inversion Properties On Nife₂O₄ Thin Films Deposited By Pulsed Laser Ablation Deposition, C. N. Chinnasamy, S. D. Yoon, Aria Yang, Ashish Baraskar, C. Vittoria, V. G. Harris
Vincent G. Harris
First principles band structure calculations suggest that the preferential occupation of Ni2+ ions on the tetrahedral sites in NiFe₂O₄ would lead to an enhancement of the exchange integral and subsequently the Néel temperature and magnetization. To this end, we have deposited NiFe₂O₄films on MgO substrates by pulsed laser deposition. The substrate temperature was varied from 700 to 900°C at 5 mTorr of O₂ pressure. The films were annealed at 1000°C for different times prior to their characterization. X-ray diffraction spectra showed either (100) or (111) orientation with the spinel structure dependent on the substrate orientation. Magnetic studies showed a magnetization …