1 Multiple Topological Magnetism in van der Waals Heterostructure of MnTe 2ZrS 2 Zhonglin He Kaiying Dou Wenhui Du Ying Dai Baibiao Huang Yandong Ma

2025-04-27 0 0 656.39KB 14 页 10玖币

侵权投诉

Multiple Topological Magnetism in van der Waals Heterostructure of MnTe2/ZrS2

Zhonglin He, Kaiying Dou, Wenhui Du, Ying Dai*, Baibiao Huang, Yandong Ma*

School of Physics, State Key Laboratory of Crystal Materials, Shandong University, Shandanan Street

27, Jinan 250100, China

*Corresponding authors: daiy60@sdu.edu.cn (Y.D.); yandong.ma@sdu.edu.cn (Y.M.)

Abstract

Topological magnetism in low-dimensional systems is of fundamental and practical importance in

condensed-matter physics and material science. Here, using first-principles and Monte-Carlo

simulations, we present that multiple topological magnetism (i.e., skyrmion and bimeron) can survive

in van der Waals Heterostructure of MnTe2/ZrS2. Arising from interlayer coupling, MnTe2/ZrS2 can

harbor a large Dzyaloshinskii-Moriya interaction. This, combined with ferromagnetic exchange

interaction, yields an intriguing skyrmion phase consisting of sub-10 nm magnetic skyrmions under

a tiny magnetic field of ~ 75 mT. Meanwhile, upon harnessing a small electric field, magnetic bimeron

can be observed in MnTe2/ZrS2 as well, suggesting the existence of multiple topological magnetism.

Through interlayer sliding, both topological spin textures can be switched on-off, suggesting their

stacking-dependent character. In addition, the impacts of 𝑑∥ and Keff on these spin textures are

revealed, and a dimensionless parameter



is utilized to describe their joint effect. These explored

phenomena and insights not only are useful for fundamental research in topological magnetism, but

also enable novel applications in nanodevices.

Keywords: skyrmion, bimeron, first-principles, Dzyalohinskii-Moriya interaction, heterostructure

Introduction

Since the first experimental observations of skyrmion lattice in bulk MnSi [1] and Fe0.5Co0.5Si thin

films [2], magnetic skyrmion, a typical topological magnetism, has been a prominent topic of

condensed matter physics [3,4]. It is a spatially localized topological spin structure that is

homotopically equivalent to a unit sphere, and characterized by quantized topological charge Q = ±1

[5]. Such non-trivial topological nature ensures an exceptional stability in terms of transition into

trivial spin textures [e.g., ferromagnetic (FM) phase], making it technologically appealing for future

memory and computing devices [6-8]. In addition to the study of magnetic skyrmions in

perpendicularly magnetized systems, there has also been much effort in searching for new forms of

topological magnetism in in-plane magnetized systems. One promising example is magnetic bimeron,

which consists of a pair of merons and is of great interest recently because of its extraordinary

properties [9,10]. In principle, magnetic bimeron is related to magnetic skyrmion with a /2-rotation

of each spin around in-plane axis [11]. As the topological charge Q is invariant under such rotation

[5], magnetic bimeron exhibits topological nature and inherent stability as well [10].

The demand for device miniaturization in modern electronics stimulates the exploration of

topological magnetism in two-dimensional (2D) materials [12,13]. The essential ingredient for the

realization of topological magnetism is the Dzyaloshinskii-Moriya interaction (DMI) that exists under

broken inversion symmetry and strong spin-orbit coupling (SOC). DMI is a form of antisymmetric

exchange interaction, establishing a preferred chirality for spin textures [14-16]. In the past years, for

realizing large DMI in 2D systems, extensive efforts have been devoted to Janus and ferroelectric

structures [17,18]. While the former requires harsh conditions to realize in experiment [19,20], the

latter severely limits the materials choices [21]. As a result, only a few 2D candidate systems have

been proposed so far [16,18,22-25]. New and general mechanism for topological magnetism

formation is highly desired for its exploration in the emerging area of 2D magnets. We also note that

DMI can be induced in 2D van der Waals heterostructure (vdWH) [12], and superior to Janus and

ferroelectric systems, vdWH systems exhibit higher experimental feasibility and tunability, providing

an ideal platform for topological magnetism research. Nonetheless, the formation of topological

magnetism in 2D vdWH is rarely reported [26,27], as the DMI is usually too weak to stabilize

topological spin textures.

Here, through first-principles calculations and Monte-Carlo (MC) simulations, we propose the

existence of multiple topological magnetism (i.e., skyrmion and bimeron) in 2D MnTe2/ZrS2 vdWH.

Due to the strong interlayer interplay, MnTe2/ZrS2 possesses a large DMI. This, along with FM

exchange interaction, results in the isolated zero-field magnetic skyrmion intrinsically in MnTe2/ZrS2.

When applying a tiny magnetic field of ~ 75 mT, intriguing skyrmion phase consisting of sub-10 nm

magnetic skyrmions occurs. On the other hand, by harnessing a small electric field, magnetic bimeron

can be observed. This confirms the existence of long-sought multiple topological magnetism in

MnTe2/ZrS2. Furthermore, under interlayer sliding, both topological spin textures can be switched off,

which suggests their stacking-dependent nature. Additionally, the roles of 𝑑∥ and Keff in the

formation of these spin textures are unveiled, and a dimensionless parameter



is utilized to

characterize their joint effect. Our results greatly enrich the research of 2D topological magnetism.

Results and Discussion

Fig. 1. (a) Top and side views of the crystal structure of MnTe2/ZrS2. The dashed diamond indicates

the unit cell of MnTe2/ZrS2. (b) Distorted octahedral geometry of Mn atom. , and 3 represent

the M-, I- and C3- symmetry, respectively. (c) DMI vectors (red arrows) between the nearest-

neighboring Mn atoms. (d) Two spin-spiral configurations of CW and ACW employed to obtain DMI

parameters and atomic-layer-resolved localization of the DMI associated SOC energy E for

MnTe2/ZrS2.

MnTe2/ZrS2 vdWH is composed of two layers of MnTe2 and ZrS2, which are known as FM metal and

nonmagnetic semiconductor, respectively. These two constituent layers both belong to the 1T

octahedral family of 2D transition metal dichalcogenides with space group P3

̅m1 (No. 164), thus

exhibiting an inversion symmetry (I-symmetry). Obviously, when stacking these two layers together,

I-symmetry is broken. Here, we consider three typical stacking patterns of MnTe2/ZrS2 [see Fig. S1],

among which the AA stacking pattern shown in Fig. 1(a) is proved to be the most stable configuration.

In the following, we only discuss the AA stacking pattern of MnTe2/ZrS2. MnTe2/ZrS2 exhibits a

distorted octahedral geometry (l1 ≠ l2) for Mn atoms, resulting in the space group P3m1 (No. 156). To

文档加载中……请稍候！
如果长时间未打开，您也可以点击刷新试试。

下载文档到电脑，查找使用更方便

10 玖币 0人已下载

立即下载

摘要：

1MultipleTopologicalMagnetisminvanderWaalsHeterostructureofMnTe2/ZrS2ZhonglinHe,KaiyingDou,WenhuiDu,YingDai*,BaibiaoHuang,YandongMa*SchoolofPhysics,StateKeyLaboratoryofCrystalMaterials,ShandongUniversity,ShandananStreet27,Jinan250100,China*Correspondingauthors:daiy60@sdu.edu.cn(Y.D.);yandong.ma@sdu....

展开>> 收起<<

1 Multiple Topological Magnetism in van der Waals Heterostructure of MnTe 2ZrS 2 Zhonglin He Kaiying Dou Wenhui Du Ying Dai Baibiao Huang Yandong Ma.pdf

共14页,预览3页

还剩页未读，继续阅读

声明：本站为文档C2C交易模式，即用户上传的文档直接被用户下载，本站只是中间服务平台，本站所有文档下载所得的收益归上传人(含作者)所有。玖贝云文库仅提供信息存储空间，仅对用户上传内容的表现方式做保护处理，对上载内容本身不做任何修改或编辑。若文档所含内容侵犯了您的版权或隐私，请立即通知玖贝云文库，我们立即给予删除！

1 Multiple Topological Magnetism in van der Waals Heterostructure of MnTe 2ZrS 2 Zhonglin He Kaiying Dou Wenhui Du Ying Dai Baibiao Huang Yandong Ma

相关推荐

开通VIP享超值会员特权

作者详情

相关内容

热门标签

举报选择: