Pinning of thermal excitations at defects in artificial dipolar arrays: A theoretical investigation

Thonig, Danny; Henk, Jürgen

doi:10.1016/j.jmmm.2015.03.048

Cited by 3 publications

(2 citation statements)

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“…In thermally active artificial kagome spin ice, the emergent magnetic monopoles remain confined, because increasing the length of the strings beyond one spin flip is energetically unfavourable 34 . Therefore, important in defining the behaviour of the monopoles are the background magnetic configuration and the artificial spin-ice geometry, both of which can be modified by introducing defects into the lattice [35][36][37] . In artificial square ice, the string tension can be exploited to obtain spontaneous magnetic currents, by stretching the bound monopoles apart with an applied magnetic field and removing the field in order to release them, and it was suggested that this effect may be of interest for energy storage 38 .…”

Section: Emergent Magnetic Monopolesmentioning

confidence: 99%

Advances in artificial spin ice

et al. 2019

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Artificial spin ices consist of nanomagnets arranged on the sites of various periodic and aperiodic lattices. They have enabled the experimental investigation of a variety of fascinating phenomena such as frustration, emergent magnetic monopoles and phase transitions that have previously been the domain of bulk spin crystals and theory , as we discuss in this Review. Artificial spin ices also show promise as reprogrammable magnonic crystals and, with this in mind, we give an overview of the measurements of fast dynamics in these magnetic metamaterials. We survey the variety of geometries that have been implemented, in terms of both the form of the nanomagnets and the lattices on which they are placed, including quasicrystalline systems and artificial spin systems in 3D. Different magnetic materials can also be incorporated to modify anisotropies and blocking temperatures, for example. With this large variety of systems, the way is open to discover new phenomena, and we complete this Review with possible directions for the future.

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Section: Emergent Magnetic Monopolesmentioning

confidence: 99%

Advances in artificial spin ice

et al. 2019

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“…Scale bar is 2 μm. in an artificial square ice when the dipolar coupling strength between two nanomagnets is lowered [25] and when a particular edge is populated with nanomagnets possessing a different magnetic dipole moment compared to the rest of the array [13]. It has also been proposed that the use of heat generated by metal strip lines adjacent to two sides of a square lattice can be used to create unidirectional currents [26].…”

Section: Introductionmentioning

confidence: 99%

Control of emergent magnetic monopole currents in artificial spin ice

et al. 2020

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The control of emergent magnetic monopoles for the generation of monopole currents in artificial spin ice is essential for their use in nanomagnet-based device applications. Here we present a scheme to inject monopole currents into an artificial square ice at specific locations, which provides a means to control the propagation of the generated emergent monopole currents. Specifically, we modify an artificial square ice by populating two of its edges with different vertex configurations consisting of two, three, and four nanomagnets meeting at a common point. After setting an initial state with a global magnetic field, injection of monopoles occurs at one of the edges where the vertices have higher switching probability. We experimentally observe this vertex-specific nucleation of emergent magnetic monopoles using x-ray photoemission electron microscopy. Additionally, we demonstrate that a lateral shift in the reversal of the magnets, leading to the formation of large domains, is consistent with theoretical simulations incorporating higher-order contributions in the magnetic Hamiltonian. Finally, we find a strong correlation between the location of emergent monopole injection and the film thickness, which is a result of the switching probability associated with the different vertex configurations.

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