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A Decanuclear 3d-4f Cluster with Slow Magnetic Relaxation

Yi-Yan Wang  Jian-Nan Li  Xiao-Yue Zhang  Shuo Xiang  Xiao-Qing Zhao  
【摘要】:Single-molecule magnets(SMMs),potential candidates for information storage devices,quantum computing,and spintronics devices,have attracted a great deal of attentions,which feature slow relaxation of magnetization,magnetic hysteresis under the blocking temperature.[1-3]Research shows that SMMs with highspin ground state and magnetic anisotropy can result in a significant barrier to thermally activated magnetization relaxation.[4]However,it is difficult to achieve.Recently,combining lanthanide metal ions with transition-metal ions to obtain SMMs with high blocking temperature has been the topic.[5]3 d ions can contribute magnetic anisotropy to the system in conjunction with the large single-ion magnetic anisotropy of4 f ions.Moreover,the ferromagnetic coupling between 3 d and 4 f ions often results in a high-spin ground state.Therefore,we employ 6,6'-dihydroxyl-2,2'-bipyridine(dhbpH_2) as ligand to build a new 3 d-4 f cluster with formula-{[Fe~Ⅲ_8 Dy~Ⅲ_2(O)_6(OH)_2(C_2 H_5 O)_2(dhbp)_4(dhbpH)(piv)_6]·4 C_2 H_5 OH}(1).The[Fe~Ⅲ_8 Dy~Ⅲ_2]metal core exhibits a sandwich-like structure,and Dy~Ⅲ_2 in the center of two[Fe~Ⅲ_4]planes(Figure 1 a).In order to probe SMM behavior,ac magnetic susceptibilities were performed for 1 in the temperature range 2-15 K with zero dc fields.Compound 1 shows the frequency-dependent out-of-phase signal(χ''),which is characteristic of SMM(Figure 1 b).

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