Unbiased evaluation of zero-field splitting D parameter in high-spin molecules from DC magnetic data with incomplete powder averaging

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS

卷:510

Article

Cornia, Andrea^1,2  Barra, Anne-Laure³  Poneti, Giordano⁴  Tancini, Erik^1,2  Sessoli, Roberta^5,6 

[1] Univ Modena & Reggio Emilia, Dept Chem & Geol Sci, I-41125 Modena, Italy

[2] INSTM, I-41125 Modena, Italy

[3] Univ Grenoble Alpes, CNRS, Lab Natl Champs Magnet Intenses, F-38042 Grenoble 9, France

[4] Univ Fed Rio de Janeiro, Inst Quim, BR-21941909 Rio De Janeiro, Brazil

[5] Univ Florence, Dept Chem Ugo Schiff, I-50019 Sesto Fiorentino, FI, Italy

[6] INSTM, I-50019 Sesto Fiorentino, FI, Italy

关键词: Single-molecule magnets;    High-spin molecules;    Magnetic anisotropy;    Zero-field splitting;    DC magnetometry;    Preferential orientation;   

DOI  :  10.1016/j.jmmm.2020.166713

来源: Elsevier

【 摘 要 】

A simple scheme is presented to account for preferential orientation effects in the DC magnetic response of polycrystalline samples of anisotropic high-spin molecules, like single-molecule magnets. A single additional least-squares parameter is introduced in the fitting of isothermal magnetization vs. field data to describe the leading part of a non-spherical distribution of anisotropy axes. The procedure is shown to afford an accurate D parameter and is potentially applicable whenever complete powder averaging cannot be achieved.

【 授权许可】

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