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|Type:||Artigo de periódico|
|Title:||Slow Magnetic Relaxation In Coiicuii Coordination Oligomer Built Into Mesoporous Material|
|Abstract:||The ferrimagnetic system CoCu(opba) [opba = ortho-phenylenebis( oxamato)] was employed to prepare a traditional chain [CoCu(opba)]·4H2O (1) and a nanocomposite by incorporation in porous Vycor glass (PVG). This nanocomposite was made by first anchoring [Bu4N]2[Cu(opba) ] on PVG [PVG-Cu (2)] and then treating it "in situ" with cobalt(II) acetate to obtain the nanomagnet PVG-CuCo (3). Magnetic measurements show that 1 consists of a one-dimensional ferrimagnet with strong intrachain antiferromagnetic coupling and weak interchain interactions that result in spin-glass behavior below 3.5 K. Nanocomposite 3 presents ferrimagnetic chains limited by the nanopore size, which leads to a slow relaxation of the magnetization following Arrhenius' law, frequency dependence for in-phase and out-of-phase susceptibility, and hysteresis below the blocked regime temperature (< 6 K). These features are characteristics of single-chain magnets (SCM). © Wiley-VCH Verlag GmbH & Co. KGaA, 2008.|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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