There is a variety of transition metal and lanthanide complexes, which exhibit properties typical of Single Ion Magnets (SIMs) only in the presence of external DC magnetic field (the so-called field induced SIMs). Here we propose composite material, in which powder sample of field induced SIM based on the recently reported hexacoordinated Co(II) complex is mixed with ferromagnetic microparticles (MPs). Controllable residual magnetic field of MPs acts as internal magnetic field suppressing quantum tunneling of magnetization and making it possible to observe slow magnetic relaxation in the cobalt complex even in the absence of external magnetic field.

中文翻译：

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单离子磁铁作为微粒阵列内场的磁探针

有多种过渡金属和镧系元素配合物，它们仅在外部直流磁场（所谓的场诱导 SIM）存在下才表现出单离子磁铁 (SIM) 的典型特性。在这里，我们提出了复合材料，其中基于最近报道的六配位 Co(II) 配合物的场致 SIM 粉末样品与铁磁微粒 (MP) 混合。MPs 的可控剩余磁场充当内部磁场，抑制磁化的量子隧穿，即使在没有外部磁场的情况下，也可以观察到钴配合物中的缓慢磁弛豫。