Magnetic Properties of La0.8K0.2MnO3 Nanoparticles
1 Institute of Experimental Physics SAS, Watsonova 47, 040 01 Košice, Slovak Republic
2 Institute of Geotechnics SAS, Watsonova 45, 040 01 Košice, Slovakia
3 Institute of Nuclear Physics Polish Academy of Sciences, Radzikowskiego 152, 31-342 Kraków, Poland
4 Institute of Chemistry, Faculty of Science, PJ Šafárik University, Moyzesova 11, 040 01 Košice, Slovakia
a Corresponding author: email@example.com
Published online: 3 July 2014
Magnetic properties of La0.8K0.2MnO3have been studied on nanoparticles prepared by glycine – nitrate method. As prepared nanoparticles and samples annealed at 300°C/2 hours adopt orthorhombic crystal structure (space group Pbnm). Crystal structure and particles size were modified by heat treatment. The exchange bias effect was observed on samples with particles size smaller than 50 nm.Cooling in magnetic field Hcf≠ 0 through the Curie temperature TCshifts hysteresis loop in horizontal and vertical direction. The values of exchange bias field HE, coercive field Hc, remnant asymmetry μE and coercive magnetization μc increase with increasing value of cooling field Hcf. In addition the training effect was studied. Basic magnetic properties like the Curie temperature TC and the saturated magnetization μsincrease and HE or μE decrease with heat treatment. Heat treatment at 600 °C/2 hours increases the average size of nanoparticles to about 60 nm, crystal structure changes to rhombohedral structure (space group Rc) and EB effect vanishes.
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