Anisotropy and domain formation in a dipolar magnetic metamaterial

Digernes, Einar; Strømberg, Anders; Vaz, C. A. F.; Kleibert, Armin; Grepstad, J. K.; Folven, Erik

doi:10.1063/5.0045450

Cited by 4 publications

(1 citation statement)

References 18 publications

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“…The emergence of an anisotropy in magnetic metamaterials has previously been demonstrated and attributed to geometrical parameters: mesospin shape and lattice symmetry [19][20][21]. Here, we show that the internal magnetic textures of disk-shaped mesospins, along with their local magnetization configurations also play an essential role.…”

Section: Introductionsupporting

confidence: 58%

Emergent anisotropy in magnetic metamaterials

Strandqvist¹,

Skovdal²,

Pohlit³

et al. 2022

Preprint

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We demonstrate directional dependence of the self-modification of internal mesospin textures in magnetic metamaterials, arising from the coupling of the atomic-and mesoscopic length-scales. Dressing the mesospins in different directions enables the quantification of the degree of texture in the internal magnetization and its impact on the interaction energy of the mesospins. The emerging anisotropy is manifested in a directional dependence of the remanent magnetization with temperature.

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Section: Introductionsupporting

confidence: 58%

Emergent anisotropy in magnetic metamaterials

Strandqvist¹,

Skovdal²,

Pohlit³

et al. 2022

Preprint

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Mesoscopic magnetic systems: From fundamental properties to devices

Heyderman

Grollier

Marrows

et al. 2021

Applied Physics Letters

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Coupling-dependent antiferromagnetic-ferromagnetic ordering in a pinwheel artificial spin ice

Strømberg,

Digernes,

Chopdekar

et al. 2024

Phys. Rev. B

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Nanopatterned magnetic thin films offer a platform for exploration of tailored magnetic properties such as emergent long-range order. A prominent example is artificial spin ice (ASI), where an arrangement of nanoscale magnetic elements, acting as macrospins, interact via their dipolar fields. In this study, we discuss the transition from antiferromagnetic (AFM) to ferromagnetic (FM) long-range order in a square lattice ASI as the magnetic elements are gradually rotated through 45∘ to a “pinwheel” configuration. The AFM-FM transition is observed experimentally using synchrotron radiation x-ray spectromicroscopy and occurs for a certain rotation angle of the nanomagnets, dependent on the dipolar coupling strength determined by the separation of the magnets in the lattice. Large-scale magnetic dipole simulations show that the point-dipole approximation fails to capture the correct AFM-FM transition angle. However, excellent agreement with experimental data is obtained using a dumbbell-dipole model, which better reflects the actual dipolar fields of the magnets. This model also explains the coupling dependence of the transition angle, another feature not captured by the point-dipole model. Our findings resolve a discrepancy between measurement and theory in previous work on “pinwheel” ASIs and establish the coupling dependence of the AFM-FM transition. The revised dipole model, with a more accurate representation of the stray field, offers more precise control of magnetic order in artificial spin systems. Published by the American Physical Society 2024

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Anisotropy and domain formation in a dipolar magnetic metamaterial

Cited by 4 publications

References 18 publications

Emergent anisotropy in magnetic metamaterials

Emergent anisotropy in magnetic metamaterials

Mesoscopic magnetic systems: From fundamental properties to devices

Coupling-dependent antiferromagnetic-ferromagnetic ordering in a pinwheel artificial spin ice

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