Soft-Magnetic Skyrmions Induced by Surface-State Coupling in an Intrinsic Ferromagnetic Topological Insulator Sandwich Structure

Takashiro, Takuya; Akiyama, Ryota; Kibirev, I. A.; Matetskiy, A. V.; Nakanishi, Ryosuke; Sato, Shunsuke; Fukasawa, Takashi; Sasaki, Taisuke; Toyama, Haruko; Hiwatari, Kota L; Зотов, А. В.; Саранин, А. А.; Hirahara, Toru; Hasegawa, Shuji

doi:10.1021/acs.nanolett.1c02952

Cited by 9 publications

(4 citation statements)

References 46 publications

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“…Particularly, the skyrmion, which is a topological spin-texture and entails a close correspondence for spin orientations between real space and momentum space, induces a novel geometric effect, namely, the topological Hall effect (THE). [62] Thus, THE can be viewed as a direct evidence for the emergence of skyrmions and has been reported in magnetically doped TIs, ferromagnet/TI and antiferromagnet/TI heterostructures. [57][58][59][60][61] The AHE generated by skyrmions in MTI thin films has been studied theoretically.…”

Section: Introductionmentioning

confidence: 95%

Spin thermoelectric effects of skyrmions in ferromagnetic topological insulators

Ye¹,

Xu²,

Zhu³

2023

J. Phys. D: Appl. Phys.

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The thermoelectric eﬀects of ferromagnetic topological insulators with either two-dimensional (2D) circular or one-dimensional (1D) domain wall skyrmions are studied theoretically. It is found that the topological spin-textures play a signiﬁcant role in the manipulation of spin-dependent thermoelectric properties. In the vicinity of the charge neutrality point, spin Seebeck coeﬃcients possess ﬁnite values whose sign and magnitude can be tuned by temperature in spite of vanishing charge Seebeck coeﬃcients. The majority of the eﬀects of circular skyrmions occurs in the edge-state transport regime by generating Fano antiresonances. While the domain wall skyrmion primarily inﬂuences the thermoelectric behaviors near the boundary between the edge-state and bulk-state transport regimes with the resonant tunneling mechanism. Both types of skyrmions which function eﬀectively in distinct transport regimes have potential applications in thermoelectrics.

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Section: Introductionmentioning

confidence: 95%

Spin thermoelectric effects of skyrmions in ferromagnetic topological insulators

Ye¹,

Xu²,

Zhu³

2023

J. Phys. D: Appl. Phys.

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“…16(a), in which a thin layer of the topological insulator (Bi,Sb) 2 Te 3 is sandwiched between thin layers of a ferromagnetic topological insulator, Mn(Bi,Sb) 2 Te 4 . 85) This sandwich heterostructure was grown on a Si(111) substrate 15; Bi atoms in the lattices are partially replaced by Sb atoms with unchanged crystal structures, which results in hole doping to tune E F . The layers were epitaxially grown, as shown by the RHEED pattern in Fig.…”

Section: Magnetic Topological Insulatorsmentioning

confidence: 99%

Surface and interface physics driven by quantum materials

Hasegawa

2024

Appl. Phys. Express

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Electronic states at boundaries of crystals, such as surfaces, interfaces, edges, hinges, corners, and extremities, play crucial roles in emerging quantum materials like graphene and similar monatomic-layer materials, van der Waals crystals, and topological insulators. Electronic states at such boundaries are different from those inside the three- or two-dimensional crystals, not only due to the truncation of crystal lattices, but also due to space-inversion-symmetry breaking and difference of topology in band structures across the boundaries. Such quantum materials are expected to advance energy-saving/-harvesting technology as well as quantum computing/information technology because of exotic phenomena such as electron’s spin-momentum locking, pure spin current, dissipation-less charge current, non-reciprocal current, possible Majorana fermions, and so on. In this review, their fundamental concepts are introduced from the viewpoint of surface physics, in which atomic and electronic structures as well as charge/spin transport properties are directly probed using state-of-art techniques.

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“…Strikingly, it was argued that the existence of Bi bilayer nanosheets intercalated at the interface of CrTe 2 and Bi 2 Te 3 should be indispensable to the formation of magnetic skyrmions [28][29][30]. Such a prerequisite for the interface is subtly coincident with another skyrmion heterostructure of Mn(Bi,Sb) 2 Te 4 sandwiched by (Bi,Sb) 2 Te 3 , where the thickness of the (Bi,Sb) 2 Te 3 spacer layer is essential to control the coupling between the gapped topological surface states in the two Mn(Bi,Sb) 2 Te 4 layers to stabilize the skyrmion formation [31]. This crucially calls for a thorough understanding of the interfacial structure in topological insulator/ magnet heterostructure.…”

Section: Future Perspectivesmentioning

confidence: 99%

Atomically constructing a van der Waals heterostructure of CrTe₂/Bi₂Te₃ by molecular beam epitaxy

Nie

Miao

et al. 2023

Mater. Futures

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A two-dimensional heterostructure with proximity coupling of magnetism and topology can provide enthralling prospects for hosting new quantum states and exotic properties that are relevant to next-generation spintronic devices. Here we synthesize a delicate van der Waals heterostructure of CrTe2/Bi2Te3 at the atomic scale via molecular beam epitaxy. Low temperature scanning tunneling microscopy/spectroscopy measurements are utilized to characterize the geometric and electronic properties of the CrTe2/Bi2Te3 heterostructure with a compressed van der Waals gap. Detailed structural analysis reveals complex interfacial structures with diversiform step heights and intriguing Moiré patterns. The formation of the interface is ascribed to the embedded characteristic of CrTe2 and Bi2Te3 with sharing Te atomic layer upon interfacing, showing intercoupled features of electronic structure for CrTe2 and Bi2Te3. Our study demonstrates a possible approach to construct artificial heterostructures with different types of ordered states, which may be of use for achieving tunable interfacial Dzyaloshinsky-Moriya interactions and tailoring the functional building blocks in low dimensions.

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Soft-Magnetic Skyrmions Induced by Surface-State Coupling in an Intrinsic Ferromagnetic Topological Insulator Sandwich Structure

Cited by 9 publications

References 46 publications

Spin thermoelectric effects of skyrmions in ferromagnetic topological insulators

Spin thermoelectric effects of skyrmions in ferromagnetic topological insulators

Surface and interface physics driven by quantum materials

Atomically constructing a van der Waals heterostructure of CrTe₂/Bi₂Te₃ by molecular beam epitaxy

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Soft-Magnetic Skyrmions Induced by Surface-State Coupling in an Intrinsic Ferromagnetic Topological Insulator Sandwich Structure

Cited by 9 publications

References 46 publications

Spin thermoelectric effects of skyrmions in ferromagnetic topological insulators

Spin thermoelectric effects of skyrmions in ferromagnetic topological insulators

Surface and interface physics driven by quantum materials

Atomically constructing a van der Waals heterostructure of CrTe2/Bi2Te3 by molecular beam epitaxy

Contact Info

Product

Resources

About

Atomically constructing a van der Waals heterostructure of CrTe₂/Bi₂Te₃ by molecular beam epitaxy