Field and Current Control of the Electrical Conductivity of an Artificial 2D Honeycomb Lattice

Chen, Yiyao; Summers, Brock; Dahal, Ashutosh; Lauter, Valeria; Vignale, Giovanni; Singh, Deepak

doi:10.1002/adma.201808298

Cited by 13 publications

(12 citation statements)

References 29 publications

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“…We overcome this obstacle by utilizing a hierarchical nanofabrication scheme using the diblock template synthesis method, which results in large size honeycomb lattice sample (∼sq. inch) with truly nanoscopic connecting element of permalloy (Ni 0.81 Fe 0.19 ) magnet in the single domain limit ∼12 nm (length) × 5 nm (width) × 8 nm (thickness) (see Supplemental Information ) ( Chen et al., 2019 ; Glavic et al., 2018 ). Consequently, the inter-elemental dipolar energy in the new lattice is very small, ∼ 15 K. An important advantage of a small energy scale lies in the feasibility of populating the honeycomb vertices using both ± Q and ±3Q charges at finite temperature.…”

Section: Resultsmentioning

confidence: 99%

Magnetic charge's relaxation propelled electricity in two-dimensional magnetic honeycomb lattice

et al. 2021

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Summary Emerging new concepts, such as magnetic charge dynamics in two-dimensional magnetic material, can provide novel mechanism for spin-based electrical transport at macroscopic length. In artificial spin ice of single domain elements, magnetic charge's relaxation can create an efficient electrical pathway for conduction by generating fluctuations in local magnetic field that couple with conduction electron spins. In a first demonstration, we show that the electrical conductivity is propelled by more than an order of magnitude at room temperature due to magnetic charge defects sub-picosecond relaxation in artificial magnetic honeycomb lattice. The direct evidence to the proposed electrical conduction mechanism in two-dimensional frustrated magnet points to the untapped potential for spintronic applications in this system.

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Section: Resultsmentioning

confidence: 99%

Magnetic charge's relaxation propelled electricity in two-dimensional magnetic honeycomb lattice

et al. 2021

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“…Thus, the phenomenon, above Neel temperature, is limited to a narrow temperature range of 18K ⩽ T ⩽ 32 K. Interestingly, it is the similar temperature range where Nd‐honeycomb was previously demonstrated to manifest the novel Wigner crystal state of magnetic charges. [ 34 ]…”

Section: Resultsmentioning

confidence: 99%

Local Spin Ice Order Induced Planar Hall Effect in Nd–Sn Artificial Honeycomb Lattice

Guo

Yumnam

Dahal

et al. 2021

Adv Elect Materials

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Geometrically frustrated materials, such as spin ice or kagome lattice, are known to exhibit exotic Hall effect phenomena due to spin chirality. For the first time, Hall effect mechanism is explored in an artificial honeycomb spin ice of Nd–Sn element using Hall probe and polarized neutron reflectivity measurements. In an interesting observation, a strong enhancement in Hall signal at relatively higher temperature of T ∼ 20 K is detected. The effect is attributed to the planar Hall effect due to magnetic moment configuration in spin ice state in low field application. In the antiferromagnetic state of neodymium at low temperature, applied field induced coupling between atomic Nd moments and conduction electrons in underlying lattice causes distinct increment in Hall resistivity at very modest field of H ∼ 0.015 T. The experimental findings suggest the development of a new research vista to study the planar and the field induced Hall effects in artificial spin ice.

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“…17 Besides the emergent magnetic properties, magnetic charge quasi-particles are also found to develop the magnetic analogue of quintessential electronic state of Wigner crystal in the simultaneous applications of electric current and magnetic field. 18 Magnetic charge's versatility in the manifestation of various ground state properties under different thermal, electrical and magnetic field tuning conditions have spurred a plethora of new researches. In this article, we report a systematic study of the evolution of magnetic charge correlation as a function of the geometrical tuning parameter e.g.…”

Section: Introductionmentioning

confidence: 99%

Various facets of magnetic charge correlation: Micromagnetic and distorted waveBorn approximation simulations study

Yumnam,

Guo,

Singh

2021

Preprint

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The emergent concept of magnetic charge quasi-particle provides a new realm to study the evolution of magnetic properties in two-dimensional artificially frustrated magnets. We report on the exploration of magnetic phases due to various magnetic charge correlation using the complementary numerical techniques of micromagnetic and distorted wave Born approximation simulations in artificial permalloy honeycomb lattice. The honeycomb element length varies between 10 nm and 100 nm, while the width and thickness are kept within the single domain limit. In addition to the charge ordered loop state, we observe disordered charge arrangement, characterized by the random distribution of ±Q charges, in single domain size honeycomb lattice. As the length of honeycomb element increases, low multiplicity magnetic charges tend to form contiguous bands in thinner lattice. Thin honeycomb lattice with 100 nm element length exhibits a perfect spin ice pattern, which remains unaffected to the modest increase in the width of element size. We simulate scattering profiles under the pretext of distorted wave Born approximation formalism for the micromagnetic phases. The results are expected to provide useful guidance in the experimental investigation of magnetic phases in artificial honeycomb magnet.

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Field and Current Control of the Electrical Conductivity of an Artificial 2D Honeycomb Lattice

Cited by 13 publications

References 29 publications

Magnetic charge's relaxation propelled electricity in two-dimensional magnetic honeycomb lattice

Magnetic charge's relaxation propelled electricity in two-dimensional magnetic honeycomb lattice

Local Spin Ice Order Induced Planar Hall Effect in Nd–Sn Artificial Honeycomb Lattice

Various facets of magnetic charge correlation: Micromagnetic and distorted waveBorn approximation simulations study

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