Atomic-scale visualization of topological spin textures in the chiral magnet MnGe

Repicky, Jacob; Wu, Po-Kuan; Liu, Tao; Corbett, Joseph; Zhu, Tiancong; Ahmed, Adam; Takeuchi, Noboru; Guerrero-Sánchez, J.; Randeria, Mohit; Kawakami, Roland; Gupta, Jay

doi:10.1126/science.abd9225

Cited by 21 publications

(16 citation statements)

References 45 publications

(89 reference statements)

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“…[21,22,25] Although several other helical magnet systems such as MnGe, FeGe, Fe 1−y Co y Ge, and Cr 1/3 NbS 2 have been reported, the magneto-Seebeck effect of helical magnetic systems finds limited mention in related literature. [26][27][28][29] Generally, field-induced alignment of magnetic moments induces the large magnetic field variation observed in these systems. Aligned magnetic moments produce this effect by reducing spin scattering, which is a primary influence on charge dynamics.…”

Section: Resultsmentioning

confidence: 99%

Large Room Temperature Anomalous Transverse Thermoelectric Effect in Kagome Antiferromagnet YMn₆Sn₆

et al. 2022

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Kagome magnets possess several novel nontrivial topological features owing to the strong correlation between topology and magnetism that extends to their applications in the field of thermoelectricity. Conventional thermoelectric (TE) devices use the Seebeck effect to convert heat into electrical energy. In contrast, transverse thermoelectric devices based on the Nernst effect are attracting recent attention due to their unique transverse geometry, which uses a single material to eliminate the need for a multitude of electrical connections compared to conventional TE devices. Here, a large anomalous transverse thermoelectric effect of ≈2 µV K−1 at room temperature in a kagome antiferromagnet YMn6Sn6 single crystal is obtained. The obtained value is larger than that of state‐of‐the‐art canted antiferromagnetic (AFM) materials and comparable with ferromagnetic systems. The large anomalous Nernst effect (ANE) can be attributed to the net Berry curvature near the Fermi level. Furthermore, the ANE of the AFM YMn6Sn6 exceeds the magnetization scaling relationship of conventional ferromagnets. The results clearly illustrate that AFM material YMn6Sn6 is an ideal topological material for room‐temperature transverse thermoelectric applications.

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Section: Resultsmentioning

confidence: 99%

Large Room Temperature Anomalous Transverse Thermoelectric Effect in Kagome Antiferromagnet YMn₆Sn₆

et al. 2022

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“…Spin-polarized STM measurements are performed using a Cr tip and sweeping the out-of-plane magnetic field. The magnetic contrast is observed in the d I /d V signal at a sample bias of 100 mV and a tip current of 0.15 nA.…”

Section: Resultsmentioning

confidence: 99%

Kinetically Controlled Epitaxial Growth of Fe₃GeTe₂ van der Waals Ferromagnetic Films

Zhou

Bishop

Zhu

et al. 2022

ACS Appl. Electron. Mater.

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We demonstrate that kinetics play an important role in the epitaxial growth of Fe3GeTe2 (FGT) van der Waals (vdW) ferromagnetic films by molecular beam epitaxy. By varying the deposition rate, we control the formation or suppression of an initial tellurium-deficient non-van-der-Waals phase (Fe3Ge2) prior to realizing epitaxial growth of the vdW FGT phase. Using cross-sectional scanning transmission electron microscopy and scanning tunneling microscopy, we optimize the FGT films to have atomically smooth surfaces and abrupt interfaces with the Ge(111) substrate. The magnetic properties of our high quality material are confirmed through magneto-optic, magnetotransport, and spin-polarized STM studies. Importantly, this demonstrates how the interplay of energetics and kinetics can help tune the re-evaporation rate of chalcogen atoms and interdiffusion from the underlayer, which paves the way for future studies of van der Waals epitaxy.

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“…With advancements in the deposition techniques, the layer thickness can also tune the Rashba-type interfacial DMI, Dresselhaus-type bulk DMI, and the anisotropy in the B20 structures, such as CrGe/MnGe/FeGe and their superlattices [38]. Additional strain control in these B20 structures can, furthermore, create complex spin textures from the superposition of different helical domains [39]. Therefore, the CrGe/MnGe/FeGe compounds could be used for the experimental realization of the discussed IPF and generate unconventional magnetic phases.…”

Section: Discussionmentioning

confidence: 99%

Interfacial phase frustration stabilizes unconventional skyrmion crystals

Mohanta,

Dagotto

2022

Preprint

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Chiral magnetic phases with an unconventional topological twist in the magnetization are of huge interest due to their potential in spintronics applications. Here, we present a general method to induce such exotic magnetic phases using interfacial phase frustration within artificially grown superlattices. To demonstrate our method, we consider a multilayer with two different chiral magnetic phases as the competing orders at the top and bottom and show, using Monte Carlo calculations, that the interfacial phase frustration is realized at the central layer. In particular, we obtain three unconventional phases: a checkerboard skyrmion crystal, an incommensurate skyrmion stripe, and a ferrimagnetic skyrmion crystal. In these frustration-induced phases, the spin chirality driven topological Hall conductivity can be largely enhanced. This method provides a playground to realize unconventional magnetic phases in any family of materials that can be grown in superlattices.

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Atomic-scale visualization of topological spin textures in the chiral magnet MnGe

Cited by 21 publications

References 45 publications

Large Room Temperature Anomalous Transverse Thermoelectric Effect in Kagome Antiferromagnet YMn₆Sn₆

Large Room Temperature Anomalous Transverse Thermoelectric Effect in Kagome Antiferromagnet YMn₆Sn₆

Kinetically Controlled Epitaxial Growth of Fe₃GeTe₂ van der Waals Ferromagnetic Films

Interfacial phase frustration stabilizes unconventional skyrmion crystals

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Atomic-scale visualization of topological spin textures in the chiral magnet MnGe

Cited by 21 publications

References 45 publications

Large Room Temperature Anomalous Transverse Thermoelectric Effect in Kagome Antiferromagnet YMn6Sn6

Large Room Temperature Anomalous Transverse Thermoelectric Effect in Kagome Antiferromagnet YMn6Sn6

Kinetically Controlled Epitaxial Growth of Fe3GeTe2 van der Waals Ferromagnetic Films

Interfacial phase frustration stabilizes unconventional skyrmion crystals

Contact Info

Product

Resources

About

Large Room Temperature Anomalous Transverse Thermoelectric Effect in Kagome Antiferromagnet YMn₆Sn₆

Large Room Temperature Anomalous Transverse Thermoelectric Effect in Kagome Antiferromagnet YMn₆Sn₆

Kinetically Controlled Epitaxial Growth of Fe₃GeTe₂ van der Waals Ferromagnetic Films