Self-organized patterns of macroscopic quantum tunneling in molecular magnets

Abstract

We study low temperature resonant spin tunneling in molecular magnets induced by a field sweep with account of dipole-dipole interactions. Numerical simulations uncovered formation of self-organized patterns of the magnetization and of the ensuing dipolar field that provide resonant condition inside a finite volume of the crystal. This effect is robust with respect to disorder and should be relevant to the dynamics of the magnetization steps observed in molecular magnets.

4 Phys. Rev. pages, 5 figures

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• Quantum avalanche in the Fe${}_8$ Molecular-Magnet
• Field-induced antiferromagnetic correlations in a nanopatterned van der Waals ferromagnet: a potential artificial spin ice
• Chaotic dynamics and spin correlation functions in a chain of nanomagnets