Magnetic response of brickwork artificial spin ice

Park, Jungsik; Le, Brian; Sklenar, Joseph; Chern, Gia Wei; Watts, Justin D.; Schiffer, P.

doi:10.1103/physrevb.96.024436

Cited by 21 publications

(17 citation statements)

References 28 publications

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“…In addition to magnetic behaviors, the magnetotransport properties of metallic kagome ice have been studied in recent experiments [4,[19][20][21][22]. The observed Hall voltage can be attributed to the anisotropic magnetore- sistance (AMR) effect.…”

Section: Introductionmentioning

confidence: 99%

Magnetotransport in Artificial Kagome Spin Ice

Chern

2017

Phys. Rev. Applied

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Magnetic nanoarray with special geometries exhibits nontrivial collective behaviors similar to those observed in the spin ice materials. Here we present a novel circuit model to describe the complex magnetotransport phenomena in artificial kagome spin ice. In this picture, the system can be viewed as a resistor network driven by voltage sources that are located at vertices of the honeycomb array. The differential voltages across different terminals of these sources are related to the ice-rules that govern the local magnetization ordering. The circuit model relates the transverse Hall voltage of kagome ice to the underlying spin correlations. Treating the magnetic nanoarray as metamaterials, we present a mesoscopic constitutive equation relating the Hall resistance to magnetization components of the system. We further show that the Hall signal is significantly enhanced when the kagome ice undergoes a magnetic-charge ordering transition. Our analysis can be readily generalized to other lattice geometry, providing a quantitative method for the design of magnetoresistance devices based on artificial spin ices.

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Section: Introductionmentioning

confidence: 99%

Magnetotransport in Artificial Kagome Spin Ice

Chern

2017

Phys. Rev. Applied

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“…Later studies investigated thermally driven dynamics in ASI (square lattice and kagome) by using materials with low blocking temperature [31] which allowed the ASI to explore the configurational phase space better than in demagnetization process [32,33] and hence achieving/reaching near ground state configurations [34][35][36]. In addition, most of the previous studies on ASI utilized single domain ferromagnetic nanoelements that behave as giant Ising spins possessing uniaxial anisotropy and emphasized newer lattice geometries, such as brickwork [37], shakti [38], tetris [12], including topological defects [18] and even quasicrystal patterns [17], that can lead to frustration where the energetics are controlled by the vertex geometry and spin topology.…”

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confidence: 99%

Tunable ground state in heterostructured artificial spin ice with exchange bias

2019

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We describe a new artificial spin ice (ASI) composed of exchange biased heterostructured nanomagnetic elements with unidirectional anisotropy and compare it with a conventional ASI constituted by ferromagnets with uniaxial anisotropy (Ising spins). The introduction of a local exchange bias field, aligned along one of the sublattices of the square ASI, lifts the spin reversal symmetry of the vertices. By varying the lattice constant of the square array, we control the ratio of exchange bias to dipolar field (H EB /H dip) and tune the ground state from an antiferromagnetic to a ferromagnetic configuration with an effective magnetic moment. The geometric frustration of dipolar interactions is moderated by a nonfrustrated local field, leading to a mesoscopic system with specific metastable states observed during the demagnetization process.

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“…The chiral plaquettes of four nanomagnets in the chiral ice can also be combined differently to give the square-kite tessellation lattice 105 . Decimating the square lattice in various ways leads to the tetris 15 , shakti 14,15 and brickwork 197 lattices. a quasi-3D structure can be obtained by offsetting one sublattice of the artificial square ice out of the plane 43 .…”

Section: Box 2 | the Family Of Artificial Spin Systems Beyond Artificmentioning

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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Magnetic response of brickwork artificial spin ice

Cited by 21 publications

References 28 publications

Magnetotransport in Artificial Kagome Spin Ice

Magnetotransport in Artificial Kagome Spin Ice

Tunable ground state in heterostructured artificial spin ice with exchange bias

Advances in artificial spin ice

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