Topological Hall Effect in a Topological Insulator Interfaced with a Magnetic Insulator

Peng Li; Jinjun Ding; Steven S.L. Zhang; James Kally; Timothy Pillsbury; Olle G. Heinonen; Gaurab Rimal; Chong Bi; August Demann; Stuart B. Field; Weigang Wang; Jinke Tang; Jidong Samuel Jiang; Axel Hoffmann; Nitin Samarth; Mingzhong Wu

doi:10.1021/acs.nanolett.0c03195

Topological Hall Effect in a Topological Insulator Interfaced with a Magnetic Insulator

Peng Li, Jinjun Ding, Steven S.L. Zhang, James Kally, Timothy Pillsbury, Olle G. Heinonen, Gaurab Rimal, Chong Bi, August Demann, Stuart B. Field, Weigang Wang, Jinke Tang, Jidong Samuel Jiang, Axel Hoffmann, Nitin Samarth, Mingzhong Wu

Research output: Contribution to journal › Article › peer-review

Abstract

A topological insulator (TI) interfaced with a magnetic insulator (MI) may host an anomalous Hall effect (AHE), a quantum AHE, and a topological Hall effect (THE). Recent studies, however, suggest that coexisting magnetic phases in TI/MI heterostructures may result in an AHE-associated response that resembles a THE but in fact is not. This Letter reports a genuine THE in a TI/MI structure that has only one magnetic phase. The structure shows a THE in the temperature range of T = 2-3 K and an AHE at T = 80-300 K. Over T = 3-80 K, the two effects coexist but show opposite temperature dependencies. Control measurements, calculations, and simulations together suggest that the observed THE originates from skyrmions, rather than the coexistence of two AHE responses. The skyrmions are formed due to a Dzyaloshinskii-Moriya interaction (DMI) at the interface; the DMI strength estimated is substantially higher than that in heavy metal-based systems.

Original language	English (US)
Pages (from-to)	84-90
Number of pages	7
Journal	Nano letters
Volume	21
Issue number	1
DOIs	https://doi.org/10.1021/acs.nanolett.0c03195
State	Published - Jan 13 2021
Externally published	Yes

Keywords

magnetic insulators
skyrmions
topological Hall effect
topological insulators

ASJC Scopus subject areas

Bioengineering
General Chemistry
General Materials Science
Condensed Matter Physics
Mechanical Engineering

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10.1021/acs.nanolett.0c03195

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title = "Topological Hall Effect in a Topological Insulator Interfaced with a Magnetic Insulator",

abstract = "A topological insulator (TI) interfaced with a magnetic insulator (MI) may host an anomalous Hall effect (AHE), a quantum AHE, and a topological Hall effect (THE). Recent studies, however, suggest that coexisting magnetic phases in TI/MI heterostructures may result in an AHE-associated response that resembles a THE but in fact is not. This Letter reports a genuine THE in a TI/MI structure that has only one magnetic phase. The structure shows a THE in the temperature range of T = 2-3 K and an AHE at T = 80-300 K. Over T = 3-80 K, the two effects coexist but show opposite temperature dependencies. Control measurements, calculations, and simulations together suggest that the observed THE originates from skyrmions, rather than the coexistence of two AHE responses. The skyrmions are formed due to a Dzyaloshinskii-Moriya interaction (DMI) at the interface; the DMI strength estimated is substantially higher than that in heavy metal-based systems.",

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doi = "10.1021/acs.nanolett.0c03195",

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T1 - Topological Hall Effect in a Topological Insulator Interfaced with a Magnetic Insulator

AU - Li, Peng

AU - Ding, Jinjun

AU - Zhang, Steven S.L.

AU - Kally, James

AU - Pillsbury, Timothy

AU - Heinonen, Olle G.

AU - Rimal, Gaurab

AU - Bi, Chong

AU - Demann, August

AU - Field, Stuart B.

AU - Wang, Weigang

AU - Tang, Jinke

AU - Jiang, Jidong Samuel

AU - Hoffmann, Axel

AU - Samarth, Nitin

AU - Wu, Mingzhong

PY - 2021/1/13

Y1 - 2021/1/13

N2 - A topological insulator (TI) interfaced with a magnetic insulator (MI) may host an anomalous Hall effect (AHE), a quantum AHE, and a topological Hall effect (THE). Recent studies, however, suggest that coexisting magnetic phases in TI/MI heterostructures may result in an AHE-associated response that resembles a THE but in fact is not. This Letter reports a genuine THE in a TI/MI structure that has only one magnetic phase. The structure shows a THE in the temperature range of T = 2-3 K and an AHE at T = 80-300 K. Over T = 3-80 K, the two effects coexist but show opposite temperature dependencies. Control measurements, calculations, and simulations together suggest that the observed THE originates from skyrmions, rather than the coexistence of two AHE responses. The skyrmions are formed due to a Dzyaloshinskii-Moriya interaction (DMI) at the interface; the DMI strength estimated is substantially higher than that in heavy metal-based systems.

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Topological Hall Effect in a Topological Insulator Interfaced with a Magnetic Insulator

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