Topological defects in weak perpendicular magnetic anisotropy NdCo honeycomb lattices

Valdés-Bango, F.; Vélez, María; Álvarez-Prado, L. M.; Martín, José Ignacio

doi:10.1088/1367-2630/aae8a8

Cited by 4 publications

(3 citation statements)

References 49 publications

(73 reference statements)

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“…Contrast profiles of the asymmetric potentials have been extracted from experimental and simulated MFM data. The experimental distribution of asymmetric Néel walls was obtained by using 24 a NANOTECH Atomic Force Microscope system with magnetic NANOSENSORS. The micromagnetic simulations were carried out with the finite difference code MuMax3 25 .…”

Section: Methodsmentioning

confidence: 99%

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Realization of macroscopic ratchet effect based on nonperiodic and uneven potentials

Rollano

Gómez

Muñoz-Noval

et al. 2021

Sci Rep

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Ratchet devices allow turning an ac input signal into a dc output signal. A ratchet device is set by moving particles driven by zero averages forces on asymmetric potentials. Hybrid nanostructures combining artificially fabricated spin ice nanomagnet arrays with superconducting films have been identified as a good choice to develop ratchet nanodevices. In the current device, the asymmetric potentials are provided by charged Néel walls located in the vertices of spin ice magnetic honeycomb array, whereas the role of moving particles is played by superconducting vortices. We have experimentally obtained ratchet effect for different spin ice I configurations and for vortex lattice moving parallel or perpendicular to magnetic easy axes. Remarkably, the ratchet magnitudes are similar in all the experimental runs; i. e. different spin ice I configurations and in both relevant directions of the vortex lattice motion. We have simulated the interplay between vortex motion directions and a single asymmetric potential. It turns out vortices interact with uneven asymmetric potentials, since they move with trajectories crossing charged Néel walls with different orientations. Moreover, we have found out the asymmetric pair potentials which generate the local ratchet effect. In this rocking ratchet the particles (vortices) on the move are interacting each other (vortex lattice); therefore, the ratchet local effect turns into a global macroscopic effect. In summary, this ratchet device benefits from interacting particles moving in robust and topological protected type I spin ice landscapes.

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Section: Methodsmentioning

confidence: 99%

“…The experimental distribution of magnetic charges was obtained by using a Nanotech™ Atomic Force Microscope system with magnetic Nanosensors™ (20). Magnetic Force Microscopy (MFM) contrast was used as a proxy for the potential asymmetric landscape of the nanomagnets.…”

Section: Experimental Methodsmentioning

confidence: 99%

Realization of macroscopic ratchet effect based on nonperiodic and uneven potentials

Rollano

Gómez

Muñoz-Noval

et al. 2021

Sci Rep

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“…In a recent publication, Valdes-Bango et al have reported a rich multidomain magnetic scenario in Co and NdCo honeycomb lattices [40] with large dimensions (2 μm bar length/ 1 μm bar width). In this case, we have chosen a Co honeycomb structure (see figure 1(a)) with small dimensions to favor single domain states in each Co bar, which is a necessary condition for the observation of artificial spin ice behavior.…”

Section: Magnetic Characterizationmentioning

confidence: 99%

Topologically protected superconducting ratchet effect generated by spin-ice nanomagnets

et al. 2019

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We have designed, fabricated and tested a robust superconducting ratchet device based on topologically frustrated spin-ice nanomagnets. The device is made of a magnetic Co honeycomb array embedded in a superconducting Nb film. This device is based on three simple mechanisms: i) the topology of the Co honeycomb array frustrates in-plane magnetic configurations in the array yielding a distribution of magnetic charges which can be ordered or disordered with in-plane magnetic fields, following spin-ice rules; ii) the local vertex magnetization, which consists of a magnetic half vortex with two charged magnetic Néel walls; iii) the interaction between superconducting vortices and the asymmetric potentials provided by the Néel walls. The combination of these elements leads to a superconducting ratchet effect. Thus, superconducting vortices driven by alternating forces and moving on magnetic half vortices generate a unidirectional net vortex flow. This ratchet effect is independent of the distribution of magnetic charges in the array.

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Artificial magnetic disclination through local stress engineering

Zhao,

Huang,

Wang

et al. 2024

Acta Materialia

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Topological defects in weak perpendicular magnetic anisotropy NdCo honeycomb lattices

Cited by 4 publications

References 49 publications

Realization of macroscopic ratchet effect based on nonperiodic and uneven potentials

Realization of macroscopic ratchet effect based on nonperiodic and uneven potentials

Topologically protected superconducting ratchet effect generated by spin-ice nanomagnets

Artificial magnetic disclination through local stress engineering

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