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 K3Fe2[(2,3,9,10,16,17,23,24-octahydroxy phthalocyaninato)Fe] (K3Fe2[PcFe-O8]) 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 cm2 V−1 s−1 as determined by time-resolved Terahertz spectroscopy. Magnetization experiments and 57Fe Mössbauer spectroscopy demonstrate the presence of long-range magnetic correlations in K3Fe2[PcFe-O8] 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.
Bibliographical noteFunding Information:
The authors thank financial support from ERC Grant on 2DMATER, and EU Graphene Flagship, Coordination Networks: Building Blocks for Functional Systems (SPP 1928, COORNET) as well as the German Science Council, Center of Advancing Electronics Dresden, EXC1056, (cfaed) and OR 349/1 and the Max Planck Society. The data of XANES and EXAFS were collected at room temperature in transmission mode at beamline BL14W1 and BL15U1 of the Shanghai Synchrotron Radiation Facility (SSRF, China). E.C. acknowledges financial support from the Max Planck Graduate Center and the regional government of Comunidad de Madrid under project (2017-T1/AMB-5207). We acknowledge Dresden Center for Nanoanalysis (DCN) at TUD, Dr. Petr Formanek and Dr. Konrad Schneider (Leibniz Institute for Polymer Research, IPF, Dresden) for the use of facilities. We also appreciate Prof. Bernd Büchner, Dr. Vladislav Kataev and Dr. Yulia Krupskaya (IFW Dresden) for the helpful discussion about the magnetic properties. T.H.and P.S.P.aknowledge the Centre for Information Services and HighPerformance Computing (ZIH) in Dresden, Germany for the provided computational resources.
© 2019, The Author(s).
All Science Journal Classification (ASJC) codes
- Biochemistry, Genetics and Molecular Biology(all)
- Physics and Astronomy(all)