Non-equilibrium magnetic properties of Sm0.43Ca0.57MnO3 nanoparticles
| Autor: | B. Dolgin, G. Jung, Roman Puzniak, I. M. Fita, A. Wisniewski, D. Mogilyansky, V. Markovich, G. Gorodetsky, E. Dvir |
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| Rok vydání: | 2014 |
| Předmět: |
Materials science
Spin glass Condensed matter physics Mechanical Engineering Relaxation (NMR) Metals and Alloys Atmospheric temperature range Condensed Matter::Disordered Systems and Neural Networks Magnetization Charge ordering Mechanics of Materials Remanence Materials Chemistry Particle size Néel temperature |
| Zdroj: | Journal of Alloys and Compounds. 602:204-209 |
| ISSN: | 0925-8388 |
| DOI: | 10.1016/j.jallcom.2014.03.018 |
| Popis: | Non-equilibrium magnetic properties of the near half-doped Sm 0.43 Ca 0.57 MnO 3 nanoparticles with an average size as small as 15 nm have been investigated by measuring temperature dependence of zero field cooled (ZFC) magnetization, ac-susceptibility, time dependence of ZFC magnetization, relaxation of the remanent magnetization, and memory effects in ZFC magnetization. For the studied particles, charge ordering, characteristic for the bulk, is gradually suppressed with decreasing particle size and fully disappears in 15 nm particles, while the Neel temperature decreases slightly from 73 K for 60 nm to 58 K for 15 nm particles. It was found that dipolar interaction between 15 nm nanoparticles is enough to leads to the formation of a superspin glass state. Characteristic features of superspin glass state, such as aging and memory effects have been observed in 15 nm samples. In a difference to atomic spin glasses, no strong rejuvenation of magnetization has been observed at low temperatures. |
| Databáze: | OpenAIRE |
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