A semiconducting layered metal-organic framework magnet.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 31332187.
- Also identified by DOI 10.1038/s41467-019-11267-w and PMC identifier 6646349.
- Licence recorded as CC BY.
- The licence permits redistribution, so the abstract is shown in full and the full text is available from the publisher.
Abstract
The realization of ferromagnetism in semiconductors is an attractive avenue for the development of spintronic applications. Here, we report a semiconducting layered metal-organic framework (MOF), namely K<sub>3</sub>Fe<sub>2</sub>[(2,3,9,10,16,17,23,24-octahydroxy phthalocyaninato)Fe] (K<sub>3</sub>Fe<sub>2</sub>[PcFe-O<sub>8</sub>]) with spontaneous magnetization. This layered MOF features in-plane full π-d conjugation and exhibits semiconducting behavior with a room temperature carrier mobility of 15 ± 2 cm<sup>2</sup> V<sup>-1</sup> s<sup>-1</sup> as determined by time-resolved Terahertz spectroscopy. Magnetization experiments and <sup>57</sup>Fe Mössbauer spectroscopy demonstrate the presence of long-range magnetic correlations in K<sub>3</sub>Fe<sub>2</sub>[PcFe-O<sub>8</sub>] arising from the magnetic coupling between iron centers via delocalized π electrons. The sample exhibits superparamagnetic features due to a distribution of crystal size and possesses magnetic hysteresis up to 350 K. Our work sets the stage for the development of spintronic materials exploiting magnetic MOF semiconductors.