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- 저자 : Eberhard Goering (검색결과 2 건)
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Magnetic Behavior of Single-Chain Magnets in Metal Organic Frameworks CPO-27-Co
Son, Kwanghyo,Goering, Eberhard,Hirscher, Michael,Oh, Hyunchul American Scientific Publishers 2017 Journal of nanoscience and nanotechnology Vol.17 No.10
<P>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.</P>
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손광효,Gisela Schütz,Eberhard Goering 한국물리학회 2020 Current Applied Physics Vol.20 No.4
A systematic study of the magnetization reversal behavior in the regular arrangement of L10-FePt based exchange- spring nanomagnets with different thicknesses of the Co soft magnetic layer is presented. The magnetic property of the hard magnet is compared to two tuned exchange-spring magnets: its systems of 20 nm L10-FePt/ 3 nm, and 7 nm Co. In particular, we focus on the switching field distribution. The exchange coupling showed narrower SFD, in spite of the decoupled part switches earlier. The magnetization switching mechanism of exchange- spring nanomagnets patterns has been revealed with a first-order reversal curves technique and the switching field distribution. Further, the microscopic results using magnetic force microscopy show that the spin rotation of the non-interacting part in the thicker soft layered exchange-spring magnet. The part influences the magnetization reversal process. According to the experimental results, exchange coupling strength can be tuned by the thickness of the soft magnetic layer.
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