Coexistence of High Magnetization and Anisotropy with Non-monotonic Particle Size Effect in Ferromagnetic PrMnO3 Nanoparticles
| Autor: | Anustup Sadhu, H. G. Salunke, Sayan Bhattacharyya |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Materials science
Condensed matter physics 02 engineering and technology Coercivity 010402 general chemistry 021001 nanoscience & nanotechnology Manganite 01 natural sciences 0104 chemical sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials Magnetization General Energy Ferromagnetism Antiferromagnetism Particle Grain boundary Physical and Theoretical Chemistry 0210 nano-technology Anisotropy |
| Zdroj: | The Journal of Physical Chemistry C. 121:21029-21036 |
| ISSN: | 1932-7455 1932-7447 |
| Popis: | Instances of the coexistence of high ferromagnetic magnetization with large anisotropy are scarce in the rare-earth manganite family. In manganites, high magnetizations are compromised with small coercivity and vice versa. Using nonaqueous sol–gel techniques, the undoped PrMnO3 nanoparticles with oxygen nonstoichiometry were rendered with exceptional ferromagnetic character. While ∼40 nm sized nanoparticles had magnetization of 84 emu/g and coercivity of 885 Oe with 50 kOe sweeping field, the bulk 2 μm sized particles showed a magnetization of 51 emu/g albeit with a higher coercivity of 2000 Oe. These parameters are so far the highest among manganite systems with similarly sized particles. The competition between the ferromagnetic and antiferromagnetic phases both at the particle core and at the grain boundaries resulted in a non-monotonous trend of magnetic properties between 20, 40, and 2 μm particles. The sudden increase of coercivity toward lower temperatures was a result of the freezing of random spi... |
| Databáze: | OpenAIRE |
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