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Discovery of a dysprosium metallocene single-molecule magnet with two high-temperature Orbach processes

Guo, Fu-Sheng, He, Mian, Huang, Guo-Zhang, Giblin, Sean R., Billington, David, Heinemann, Frank W., Tong, Ming-Liang, Mansikkamäki, Akseli and Layfield, Richard A. 2022. Discovery of a dysprosium metallocene single-molecule magnet with two high-temperature Orbach processes. Inorganic Chemistry 61 (16) , 6017–6025. 10.1021/acs.inorgchem.1c03980

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Abstract

Magnetic bistability in single-molecule magnets (SMMs) is a potential basis for new types of nanoscale information storage material. The standard model for thermally activated relaxation of the magnetization in SMMs is based on the occurrence of a single Orbach process. Here, we show that incorporating a phosphorus atom into the framework of the dysprosium metallocene [(CpiPr5)Dy(CpPEt4)]+[B(C6F5)4]− (CpiPr5 is penta-isopropylcyclopentadienyl, CpPEt4 is tetraethylphospholyl) leads to the occurrence of two distinct high-temperature Orbach processes, with energy barriers of 1410(10) and 747(7) cm–1, respectively. These barriers provide experimental evidence for two different spin–phonon coupling regimes, which we explain with the aid of ab initio calculations. The strong and highly axial crystal field in this SMM also allows magnetic hysteresis to be observed up to 70 K, using a scan rate of 25 Oe s–1. In characterizing this SMM, we show that a conventional Debye model and consideration of rotational contributions to the spin–phonon interaction are insufficient to explain the observed phenomena.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Additional Information: CC-BY
Publisher: American Chemical Society
ISSN: 0020-1669
Date of First Compliant Deposit: 19 May 2022
Date of Acceptance: 22 December 2021
Last Modified: 06 Jun 2022 09:15
URI: https://orca.cardiff.ac.uk/id/eprint/149866

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