Anisotropic properties of spin avalanches in crystals of nanomagnets

Abstract

Anisotropy effects for spin avalanches in crystals of nanomagnets are studied theoretically with the external magnetic field applied at an arbitrary angle to the easy axis. Starting with the Hamiltonian for a single nanomagnet in the crystal, the two essential quantities characterizing spin avalanches are calculated: the activation energy and the Zeeman energy. The calculation is performed numerically for the wide range of angles and analytical formulas are derived within the limit of small angles. The anisotropic properties of a single nanomagnet lead to anisotropic behavior of the magnetic deflagration speed. Modifications of the magnetic deflagration speed are investigated for different angles between the external magnetic field and the easy axis of the crystals. Anisotropic properties of magnetic detonation are also studied, which concern, first of all, temperature behind the leading shock and the characteristic time of spin switching in the detonation.

arXiv comment15 pages, 15 figures

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Cited by in corpus (6)

• Dynamic behavior of magnetic avalanches in the spin-ice compound Dy${}_2$Ti${}_2$O${}_7$
• Onset of a Propagating Self-Sustained Spin Reversal Front in a Magnetic System
• Multidimensional instability and dynamics of spin-avalanches in crystals of nanomagnets
• Partial spin reversal in magnetic deflagration
• Multilevel model for magnetic deflagration in nanomagnet crystals
• Counterpart of the Darrieus-Landau instability at a magnetic deflagration front