Thermally induced magnetic relaxation in square artificial spin ice

Abstract

The properties of natural and artificial assemblies of interacting elements, ranging from Quarks to Galaxies, are at the heart of Physics. The collective response and dynamics of such assemblies are dictated by the intrinsic dynamical properties of the building blocks, the nature of their interactions and topological constraints. Here we report on the relaxation dynamics of the magnetization of artificial assemblies of mesoscopic spins. In our model nano-magnetic system - square artificial spin ice - we are able to control the geometrical arrangement and interaction strength between the magnetically interacting building blocks by means of nano-lithography. Using time resolved magnetometry we show that the relaxation process can be described using the Kohlrausch law and that the extracted temperature dependent relaxation times of the assemblies follow the Vogel-Fulcher law. The results provide insight into the relaxation dynamics of mesoscopic nano-magnetic model systems, with adjustable energy and time scales, and demonstrates that these can serve as an ideal playground for the studies of collective dynamics and relaxations.

arXiv comment15 pages, 5 figures

References in corpus (4)

• Artificial "spin ice" in a geometrically frustrated lattice of nanoscale ferromagnetic islands
• Spectral analysis of topological defects in an artificial spin-ice lattice
• Dynamic response of an artificial square spin ice
• Reconfigurable spin wave band structure of artificial square spin ice

Cited by in corpus (16)

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• Vogel-Fulcher-Tammann Freezing of a Thermally Fluctuating Artificial Spin Ice Probed by X-ray Photon Correlation Spectroscopy
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• Selective and Fast Plasmon-Assisted Photo-Heating of Nanomagnets; A New Route for Opto-Activated Nanomagnetic Logic and Artificial Spin Systems
• Experimental and theoretical evidences for the ice regime in planar artificial spin ices
• Chiral switching and dynamic barrier reductions in artificial square ice
• Collective magnetic dynamics in artificial spin ice probed by AC susceptibility
• The effect of confinement on thermally induced fluctuations in nanomagnets
• Collective magnetization dynamics in nano-arrays of thin FePd discs
• Multiple energy-scales in vertex-frustrated mesospin systems
• Magnetization dynamics of weakly interacting sub-100 nm square artificial spin ices
• Thermal excitations within and among mesospins in artificial spin ice
• Texture fluctuations and emergent dynamics in coupled nanomagnets
• Relaxation pathways and emergence of domains in square artificial spin ice
• Ultrafast Laser-Induced Magnetic Relaxation in Artificial Spin Ice Driven by Dipolar Interactions
• Magnetic texture control in ion-implanted metamaterials