Journal
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
Volume 17, Issue 10, Pages 7541-7546Publisher
AMER SCIENTIFIC PUBLISHERS
DOI: 10.1166/jnn.2017.14817
Keywords
Metal Organic Frameworks; Single Molecule Magnet; Magnetic Configuration
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Funding
- National Research Foundation of Korea(NRF) - Ministry of Science, ICT and Future Planning [NRF-2016R1C1B1007364]
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Nanoscale molecular magnets of highly porous and crystalline Metal-organic frameworks (MOFs) have attracted increasing interest in recent years because of their potential application in nano-magnetic device or matrices for encapsulating of a large variety of substances. For that, a fundamental understanding of its origin of magnetism in MOFs would be essential and will provide useful insight for intelligent design of their electromagnetic properties (e.g., single-chain magnets, single-ion magnets or single-molecule magnets). Herein, we experimentally investigate the magnetic property of hexagonal 1-D channel MOFs composed of metal(cobalt) cluster connected with organic linker (so-called CPO-27-Co). Through a fundamental physisorption analysis, in-depth magnetic studies by use of superconducting quantum interference device (SQUID) magnetometry, and theoretically by the application of an isotropic Heisenberg Hamiltonian, we found a magnetic configuration of CPO-27-Co exhibiting both a weak ferro-and antiferromagnetism with cobalt magne-tocrystalline anisotropy. Interestingly, when a magnetic configuration of cobalt cluster (instead of ionic cobalt inside cluster of CPO-27) are considered, the inter Co cluster interaction exhibits superparamagnetic behavior while inside of Co cluster (ionic Co-Co interaction) is dominated by a weak ferromagnetic component.
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