Ferromagnetic Cr2Te3 nanorods with ultrahigh coercivity

Fang Wang, Juan Du, Fan Sun, Renat F. Sabirianov, Nabil Al-Aqtash, Debasis Sengupta, Hao Zeng, Xiaohong Xu

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Abstract

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.

Original languageEnglish (US)
Pages (from-to)11028-11033
Number of pages6
JournalNanoscale
Volume10
Issue number23
DOIs
StatePublished - Jun 21 2018

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ASJC Scopus subject areas

  • Materials Science(all)

Cite this

Wang, F., Du, J., Sun, F., Sabirianov, R. F., Al-Aqtash, N., Sengupta, D., Zeng, H., & Xu, X. (2018). Ferromagnetic Cr2Te3 nanorods with ultrahigh coercivity. Nanoscale, 10(23), 11028-11033. https://doi.org/10.1039/c8nr02272k