Quantum Spin Dynamics in Molecular Magnets

TL;DR

This paper reviews the theoretical understanding of quantum spin dynamics in molecular magnets, highlighting phenomena like quantum tunneling, Berry phase oscillations, and potential applications in quantum data processing.

Contribution

It provides a comprehensive overview of quantum effects in molecular magnets, emphasizing recent theoretical insights and experimental prospects for technological applications.

Findings

Quantum effects in ferromagnetic and antiferromagnetic clusters are well understood.

Berry phase oscillations in Fe_8 indicate quantum interference of tunneling paths.

Molecular clusters are promising for quantum data storage and processing.

Abstract

The detailed theoretical understanding of quantum spin dynamics in various molecular magnets is an important step on the roadway to technological applications of these systems. Quantum effects in both ferromagnetic and antiferromagnetic molecular clusters are, by now, theoretically well understood. Ferromagnetic molecular clusters allow one to study the interplay of incoherent quantum tunneling and thermally activated transitions between states with different spin orientation. The Berry phase oscillations found in Fe_8 are signatures of the quantum mechanical interference of different tunneling paths. Antiferromagnetic molecular clusters are promising candidates for the observation of coherent quantum tunneling on the mesoscopic scale. Although challenging, applications of molecular magnetic clusters for data storage and quantum data processing are within experimental reach already with present day technology.