Tuning quantum tunnelling of magnetization through 3d–4f magnetic interactions: an alternative approach for manipulating single-molecule magnetism

Abstract

The quantum tunnelling of magnetization was observed in [Zn2Dy2], contrarily it was quenched in [Mn2Dy2] and [Co2Dy2] by spin–spin exchange.

Single‐Crystal to Single‐Crystal Transformations and Magnetic Properties of a Series of “Butterfly” NiII2LnIII2 Compounds: SMM Behavior of the Dysprosium(III) Analogue

“…The ten “butterfly” compounds Ni II 2 Ln III 2 (Ln = Gd, Tb, Dy, Ho, Er), compounds 1 – 5 and 1A – 5A , are the second set of examples (next to the Zn II 2 Dy III 2 /Co II 2 Dy III 2 /Mn II 2 Dy III 2 compounds reported very recently, during the progress of the present investigation) of 3d–4f systems derived from a Schiff base ligand, obtained on [1+1] condensation of 3‐ethoxysalicylaldehyde and an amino alcohol or aminophenol (the latter component in this study is 2‐aminophenol; the ligand is H 2 L).…”

Tuning the Magnetization Dynamic Properties of Nd⋅⋅⋅Fe and Nd⋅⋅⋅Co Single‐Molecular Magnets by Introducing 3 d–4 f Magnetic Interactions

“…It is well-known that magnetic exchange interactions are good for suppressing the QTM andi mproving the properties of SMMs. [22] However,i nt his system, complexes 1 and 2 were not SMMs in zero field, thus suggesting that a weak magnetic exchange interaction may not work.…”

The Charge Transfer Approach to Heavier Main‐Group Element Radicals in Transition‐Metal Complexes

“…However,n op eaks of c'' was observed, suggesting that quantum tunneling of the magnetization (QTM) was only partially suppressed in the relaxation process through magnetic exchange interaction of the Fe II ion with the phosphorus radical. [18] Theapplication of dc fields of 5.0 and 3.0 kOe during the measurements of 1Co and 1Fe,r espectively,l ed to the clear observation of frequency-dependent maxima of c'' (Figure 4). Ther elaxation time (t)w as extracted by the generalized Debye model using CCFIT program [19] with the parameters a in 0.16-0.87 and 0-0.24 for 1Co and 1Fe,r espectively (Supporting Information, Tables S4 and S5).…”

“…However,n op eaks of c'' was observed, suggesting that quantum tunneling of the magnetization (QTM) was only partially suppressed in the relaxation process through magnetic exchange interaction of the Fe II ion with the phosphorus radical. [18] Af itting with the equation t À1 = CT n + t 0 À1 exp(U eff /k B T), where C is the coefficient of Raman process,i si nl ine with the data over the whole temperature regime,g iving parameters of C = 9.11 s À1 K À7.02 , n = 7.02, t 0 = 1.30 10 À13 s, and U eff = 53.7 K( Supporting Information, Figure S14). Ther elaxation time (t)w as extracted by the generalized Debye model using CCFIT program [19] with the parameters a in 0.16-0.87 and 0-0.24 for 1Co and 1Fe,r espectively (Supporting Information, Tables S4 and S5).…”

“…Given that 1Fe shows an exponential increase,amodel with Raman and Orbach relaxation processes is more reasonable. [18] Af itting with the equation t À1 = CT n + t 0 À1 exp(U eff /k B T), where C is the coefficient of Raman process,i si nl ine with the data over the whole temperature regime,g iving parameters of C = 9.11 s À1 K À7.02 , n = 7.02, t 0 = 1.30 10 À13 s, and U eff = 53.7 K( Supporting Information, Figure S14).…”