|
ИСТИНА |
Войти в систему Регистрация |
ИСТИНА ЦЭМИ РАН |
||
Investigations on temperature-dependent magnetic properties and magnetic thermal stability of magnesium ferrite (MgFe2O4) nanoparticlesстатья
Дата последнего поиска статьи во внешних источниках: 19 июня 2024 г.
- Авторы: Naagar Manish, Chalia Sonia, Wan Fayu, Panina Larissa V., Thakur Preeti, Sharma P.B., Thakur Atul
- Журнал: Journal of Magnetism and Magnetic Materials
- Том: 592
- Год издания: 2024
- Издательство: Elsevier BV
- Местоположение издательства: Netherlands
- Номер статьи: 171798
- DOI: 10.1016/j.jmmm.2024.171798
- Аннотация: Low temperature magnetization measurements of citrate precursor-synthesized magnesium ferrite nanoparticles (MFNPs) of ∼ 27 nm were conducted by progressively lowering the temperature from 300 K to 100 K. Hysteresis curves revealed unsaturated magnetization even at ± 15 kOe, attributed to surface spins. Specific saturation magnetization (σs) and coercivity (Hc) experienced an increase from 26.46 emu/g (300 K) to 34.79 emu/g (100 K), and from 92 Oe (300 K) to 187 Oe (100 K), respectively. Specific remanence magnetization (σr) rose from 5.58 emu/g (300 K) to 10.14 emu/g (100 K), indicating a notable shift in magnetic behavior. Effective anisotropy constant (Keff) showed significant growth from 2474.14 erg/g (300 K) to 6635.04 erg/g (100 K), highlighting low magnetocrystalline anisotropy at room temperature. The rise in magnetic moment (nB) from 0.95 Am2 at 300 K to 1.25 Am2 at 100 K indicates improved magnetic alignment and stability, particularly at lower temperatures. Correlation analysis revealed strong negative curvilinear correlations between magnetic properties and temperature. Extrapolation estimated the blocking temperature (∼573 K), coercivity at 0 K (∼249 Oe), and Curie temperature (∼660 K). These results suggest promising applications in space technology, underscoring the enhanced sensitivity of MFNPs to external magnetic fields in cold environments.
- Добавил в систему: Панина Лариса Владимировна