Synthesis and Properties of Nano-Sized Magnetic Hard Materials
Abstracts of 28th Scientific Conference 2012
Imants Dirba, Andris Šutka, Gundars Mežinskis, J. Majorovs, Jānis Kleperis

Researchers have long been interested in magnetic nanoparticles, and developed a variety of synthesis methods. In bulk material made from nanoparticles the high surface/volume ratio makes the surface disorder effect to be dominant and magnetic moments from nanosized particles are compensated, therefore still a challenge remains to find a method to keep the magnetic moments of nanoparticles oriented in bulk material. The structure and properties of ferromagnetic nanomaterials can be tailored to adjust necessary magnetization or hysteresis what is used as magnetic memory. The task of this work is to acquire synthesis of magnetically hard nano-sized materials and their thin films with high coercivity of oriented magnetic moments from nanoparticles for application in different magnetic memory and micro-generation devices. Magnetic CoFe2O4 and BaFe12O19 ZnFe2O4 nanopowders and thin films were obtained using sol-gel auto-ignition and spray-pyrolysis methods. As raw materials the nitrates of the corresponding metal cations were used, which were dissolved in distilled water at respective molar ratio. Structure and composition of synthesized materials were measured with X-ray diffractometer and X-ray fluorescence (XRF) spectrometer with micro-focused Xray excitation. The morphology of nano-size powders and thin film is examined with SEM. Magnetic properties were measured on magnetic susceptibility stand in Institute of Physics.


Keywords
Magnetic materials, nanomaterials

Dirba, I., Šutka, A., Mežinskis, G., Majorovs, J., Kleperis, J. Synthesis and Properties of Nano-Sized Magnetic Hard Materials. In: Abstracts of 28th Scientific Conference, Latvia, Rīga, 8-10 February, 2012. Rīga: LU Cietvielu Fizikas institūts, 2012, pp.48-48.

Publication language
Latvian (lv)
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