Based on 3d-4f Ions

A deeper analysis [80] on this Cu - Dy chain showed that NN and NNN interactions are efficient above Tc and that inter spin-ladder ferromagnetic interaction is observed in this family of compounds [79-82]. Attempts were made to use the 3d tectons with other lanthanide precursors, such as hexanuclear lanthanide clusters. Regular chains were obtained with Dy-Cu ferromagnetic interaction but their close packing prevents observation of SCM behaviour [83]. 

First attempts to obtain 3d-4f-based regular chains were made with Cu-Tb chains that show characteristic features of SCM but without structural characterization [84, 85]. Similarly, Co - Dy based chains were obtained but showed very weak x lx ratio making the analysis of the magnetic slow relaxation difficult [86]. Lastly, some magnetic interplay between manganese oxide chains and Dy09 units 

A ferrimagnetic chain of Dy2Cu2 tetramers was obtained by the ingenious use of Dy(hfac)3 and [Cu(dmg)(Hdmg)] as tectons (H2dmg = dimethylglyoxime) 

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