Quantum spin dynamics in mesoscopic magnets

Calorimetric Investigation of Phase Transitions Occurring in Molecule-Based Magnets

“…282 Although the antiferromagnetic ring with a spin ground state of S ) 0 does not fall into the SMM category, it should be discussed here since it is one of exchange-coupled finite spin systems of great interest in the quantum effect involved. Calorimetric studies reported cover [LiFe 6 (OCH 3 ) 12 (dbm) 6 16 ].…”

“…Antiferromagnetic rings, especially ferric wheels , were extensively investigated aiming to elucidate the quantum coherence found in the avoided crossing in Zeeman-splitting spin levels . Although the antiferromagnetic ring with a spin ground state of S = 0 does not fall into the SMM category, it should be discussed here since it is one of exchange-coupled finite spin systems of great interest in the quantum effect involved.…”

“…Antiferromagnetic rings, especially ferric wheels, were extensively investigated aiming to elucidate the quantum coherence found in the avoided crossing in Zeeman-splitting spin levels. 282 Although the antiferromagnetic ring with a spin ground state of S ) 0 does not fall into the SMM category, it should be discussed here since it is one of exchange-coupled finite spin systems of great interest in the quantum effect involved. Calorimetric studies reported cover [LiFe 6 (OCH 3 ) 12 (dbm) 6 ]PF 6 , 283,284 [NaFe 6 (OCH 3 ) 12 (pmdbm) 6 ]-PF 6 , [283][284][285] [LiFe 6 (OCH 3 ) 12 (dbm) 6 ]BPh 4 , 286 [Fe 10 (OCH 3 ) 20 -(C 2 H 2 O 2 Cl) 10 ], 285 [Fe 12 (OCH 3 ) 12 (dbm) 12 ], 287 and [Cr 8 F 8piv 16 ].…”

Syntheses, Crystal Structures, and Magnetic Properties of Two Cyclic Clusters Comprising Six Iron(III)/Manganese(III) Ions and Entrapping Sodium Ions

“…In recent years, iron and manganese clusters with oxygen atoms acting as bridging ligands have become the focus of intensive research activity since this class of inorganic complexes possesses a variety of structures and is of current interest in materials and bioinorganic chemistry. − For example, nanosized molecules with a high-spin ground state afford single-domain magnets, − which may display hysteresis, − slow magnetic relaxation, − and spin-quantum tunneling characteristics of a purely molecular origin. − One of the most successful synthetic approaches to new polynuclear clusters involves the use of chelates containing alcohol groups because alkoxides are good bridging groups for their versatile bridging modes (μ 2 and μ 3 ) and thus favor the formation of polynuclear products. − Subtle changes in reaction conditions have resulted in the formation of unexpected beautiful structures, such as ring-shaped iron or manganese clusters. − Ring-shaped structures occupy a special position among polynuclear complexes for many reasons, not the least of which are their pleasing structural aesthetics. Several recent theoretical studies have indicated that transition metal wheel complexes could be the basis for quantum computation …”

Wheel-Shaped [Mn12] Single-Molecule Magnets

“…On the other hand, wheel-shaped clusters of Mn are rare with very few reported examples. − Wheel-shaped structures occupy a special position among polynuclear complexes for many reasons, not the least of which are the pleasing structural aesthetics − The study and synthesis of antiferromagnetic rings has been pointed out as a significant area of research for nanomagnetism in a recent review paper …”