Ferromagnetic Cr2Te3 nanorods with ultrahigh coercivity
| Autor: | Debasis Sengupta, Fang Wang, Nabil Al-Aqtash, Xiaohong Xu, Juan Du, Fan Sun, Hao Zeng, Renat Sabirianov |
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| Rok vydání: | 2018 |
| Předmět: |
010302 applied physics
Materials science Condensed matter physics Stacking 02 engineering and technology Chemical disorder Coercivity 021001 nanoscience & nanotechnology Magnetocrystalline anisotropy 01 natural sciences Ferromagnetism Molar ratio Phase (matter) 0103 physical sciences General Materials Science Nanorod 0210 nano-technology |
| Zdroj: | Nanoscale. 10:11028-11033 |
| ISSN: | 2040-3372 2040-3364 |
| Popis: | Ferromagnetic Cr2Te3 nanorods were synthesized by a one-pot high-temperature organic-solution-phase method. The crystalline phases and magnetic properties can be systematically tuned by varying the molar ratio of the Cr and Te precursors. A magnetically hard phase, identified as chemically ordered Cr2Te3, is the dominating one at the precursor ratio between Cr : Te = 1 : 1.2 and 1 : 1.8. A magnetically soft phase, attributed to chemical disorder due to composition inhomogeneity and stacking faults, is present under either Cr-rich or Te-rich synthesis conditions. A large coercivity of 9.6 kOe is obtained for a Cr : Te precursor ratio of 1 : 1.8, which is attributed to the large magnetocrystalline anisotropy of ordered Cr2Te3 nanorods, and verified by density-functional theory calculations. The hard and soft phases sharing coherent interfaces co-exist in a seemingly single-crystalline nanorod, showing an unusual transition from exchange-coupled behavior at higher temperatures to two-phase behavior as the temperature is lowered. |
| Databáze: | OpenAIRE |
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