Zn and Zr co-doped M-type strontium hexaferrite: Synthesis,characterization and hyperthermia application |
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Authors: | Majid Abdellahi Aliakbar Najfinezhad Saeed Saber-Samanadari Amirsalar Khandan Hamid Ghayour |
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Affiliation: | 1. Advanced Materials Research Center, Department of Materials Engineering, Najafabad Branch, Islamic Azad University, Najafabad, Iran;2. New Technologies Research Center, Amirkabir University of Technology, Tehran, Iran;3. Young Researcher and Elite Club Khomeinishahr Branch, Islamic Azad University, Khomeinishahr, Isfahan, Iran |
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Abstract: | In the present study, hard ferromagnetic (M-type strontium hexaferrite) SrFe12O19 was co-doped by Zn and Zr for magnetic hyperthermia applications. As a result of the high concentration of single domain SrFe12O19 nanoparticles (suspended in the ferrofluid), they found a large hydrodynamic diameter, which caused a long-time Brownian relaxation under the AC magnetic field. On the other hand, increasing the Zn-Zr content (low concentration of SrFe12O19) led to a drop in anisotropy, which coincided with a short-time N´eel relaxation. All of the substituted samples with a multi-disperse state in ferrofluid exhibited an almost equal amount of the N´eel and Brownian effects. Consequently, the magnetic saturation (Ms) was considered as the dominant factor in the specific absorption rate (SAR) of the substituted samples. Transformation to the mono-disperse state was followed by the decrease of the Brownian relaxation time and hence the increase of the SAR. The interesting point in mono-disperse state was the heat generation of pure SrFe12O19 under the AC magnetic field as a result of the decrement of the Brownian relaxation time. |
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Keywords: | 12 Hyperthermia Magnetic nanoparticles Specific absorption rate |
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