Observation of skyrmion-like magnetism in magnetic Weyl semimetal Co3Sn2S2

Hc, Wu; Sun, Pei-Jun; Hsieh, Dong-Jie; Chen, H.J.; Kakarla, D. Chandrasekhar; Deng, Liangzi; Chu, C. W.; Yang, H. D.

doi:10.1016/j.mtphys.2020.100189

Cited by 28 publications

(26 citation statements)

References 32 publications

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“…Several mechanisms can lead to the stabilization of a skyrmion spin texture, with examples in thin films, multilayer stacks, and bulk materials [1,2]; the region of stability of the skyrmion phase in the B-T phase diagram is quite different in different systems ( Fig. 1) [5][6][7][8][9][10][11][12][13][14][15][16][17]. For applications it is important to understand the spin dynamics of skyrmions, which are most commonly studied in systems which host a skyrmion lattice (SkL).…”

Section: Introductionmentioning

confidence: 99%

Megahertz dynamics in skyrmion systems probed with muon-spin relaxation

et al. 2021

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We present longitudinal-field muon-spin relaxation (LF μSR) measurements on two systems that stabilize a skyrmion lattice (SkL): Cu 2 OSeO 3 , and Co x Zn y Mn 20−x−y for (x, y) = (10, 10), (8, 9), and (8, 8). We find that the SkL phase of Cu 2 OSeO 3 exhibits emergent dynamic behavior at megahertz frequencies, likely due to collective excitations, allowing the SkL to be identified from the μSR response. From measurements following different cooling protocols and calculations of the muon stopping site, we suggest that the metastable SkL is not the majority phase throughout the bulk of this material at the fields and temperatures where it is often observed. The dynamics of bulk Co 8 Zn 9 Mn 3 are well described by 2 GHz excitations that reduce in frequency near the critical temperature, while in Co 8 Zn 8 Mn 4 we observe similar behavior over a wide range of temperatures, implying that dynamics of this kind persist beyond the SkL phase.

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Section: Introductionmentioning

confidence: 99%

Megahertz dynamics in skyrmion systems probed with muon-spin relaxation

et al. 2021

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“…Our studies of transport, magnetization and ferromagnetic resonance reveal a semi-hard-magnetic phase, and hence the unique link of ASKs to anisotropies, not possible in the cubic B20 compounds with weak anisotropy. We find this hard magnetic phase to increase as we reduce the thickness of the sample, which is particularly interesting for scalable electronic devices [47][48][49]. Many hard magnetic materials are strongly susceptible to finite sizes and may display nontrivial magnetic textures detectable by Hall transport [29,50].…”

Section: Discussionmentioning

confidence: 88%

Antiskyrmions and their electrical footprint in crystalline mesoscale structures

Winter¹,

Gonçalves²,

Soldatov³

et al. 2021

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Skyrmionics materials hold the potential for future information technologies, such as racetrack memories. Key to that advancement are skyrmionics systems that exhibit high tunability and scalability, with stored information being easy to read and write by means of all-electrical techniques.Topological magnetic excitations, such as skyrmions and antiskyrmions give rise to a characteristic topological Hall effect (THE) in electrical transport. However, an unambiguous transport signature of antiskyrmions, in both thin films and bulk samples has been challenging to date. Here we apply magnetosensitive microscopy combined with electrical transport to directly detect the emergence of antiskyrmions in crystalline microstructures of Mn 1.4 PtSn at room temperature. We reveal the THE of antiskyrmions and demonstrate its tunability by means of finite sizes, field orientation, and temperature. Our atomistic simulations and experimental anisotropy studies demonstrate the link between antiskyrmions and a complex magnetism that consists of competing ferro-and antiferromagnetic as well as chiral exchange interactions.

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Section: Discussionmentioning

confidence: 99%

Antiskyrmions and their electrical footprint in crystalline mesoscale structures

Winter¹,

Gonçalves²,

Soldatov³

et al. 2021

Preprint

View full text Add to dashboard Cite

Skyrmionics materials hold the potential for future information technologies, such as racetrack memories. Key to that advancement are skyrmionics systems that exhibit high tunability and scalability, with stored information being easy to read and write by means of all-electrical techniques. Topological magnetic excitations, such as skyrmions and antiskyrmions give rise to a characteristic topological Hall effect (THE) in electrical transport. However, an unambiguous transport signature of antiskyrmions, in both thin films and bulk samples has been challenging to date. Here we apply magnetosensitive microscopy combined with electrical transport to directly detect the emergence of antiskyrmions in crystalline microstructures of Mn1.4PtSn at room temperature. We reveal the THE of antiskyrmions and demonstrate its tunability by means of finite sizes, field orientation, and temperature. Our atomistic simulations and experimental anisotropy studies demonstrate the link between antiskyrmions and a complex magnetism that consists of competing ferro- and antiferromagnetic as well as chiral exchange interactions.

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Observation of skyrmion-like magnetism in magnetic Weyl semimetal Co3Sn2S2

Cited by 28 publications

References 32 publications

Megahertz dynamics in skyrmion systems probed with muon-spin relaxation

Megahertz dynamics in skyrmion systems probed with muon-spin relaxation

Antiskyrmions and their electrical footprint in crystalline mesoscale structures

Antiskyrmions and their electrical footprint in crystalline mesoscale structures

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