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Slow magnetic relaxation mechanisms in erbium SIMs

Authors: Silva, MR; Martín-Ramos, P; Coutinho, JT; Pereira, LCJ; Lavín, V; Martín, IR; Silva,PSP; Martín-Gil, J

Ref.: Dalton Trans. 44(3), 1264-1272 (2015)

Abstract: The magnetic properties of two similar Er 3+ complexes have been investigated. [Er(tpm) 3 (bipy)] (Htpm = 1,1,1-tri fl uoro-5,5-dimethyl-2,4-hexanedione and bipy = 2,2 ’ -bipyridine) displays thermally activated slow relaxation of magnetisation under a zero direct-current (DC) fi eld. Under an applied H DC fi eld of 1000 G, [Er(tpm) 3 (bipy)] exhibits two thermally activated processes with energy barriers of 9 and 40 K, while [Er(tfa) 3 (bipy)] (Htfa = 4,4,4-tri fl uoro-1-(2-furyl)-1,3-butanedione) shows only one activated process with a barrier of 15 K. Both compounds are luminescent in the solid state, emitting in the near IR region.

DOI: 10.1039/c4dt02767a