Please use this identifier to cite or link to this item: https://doi.org/10.1002/smll.202004683
Title: Emergent Topological Hall Effect at a Charge-Transfer Interface
Authors: Lim, Zhi Shiuh 
Li, Changjian 
Huang, Zhen 
Chi, Xiao 
Zhou, Jun 
Zeng, Shengwei 
Omar, Ganesh Ji 
Feng, Yuan Ping 
Rusydi, Andrivo 
Pennycook, Stephen John 
Venkatesan, Thirumalai 
Ariando, Ariando 
Keywords: Science & Technology
Physical Sciences
Technology
Chemistry, Multidisciplinary
Chemistry, Physical
Nanoscience & Nanotechnology
Materials Science, Multidisciplinary
Physics, Applied
Physics, Condensed Matter
Chemistry
Science & Technology - Other Topics
Materials Science
Physics
CaIrO3
charge transfer
Skyrmion&#8208
like bubbles
spin&#8208
orbit coupling
topological Hall effect
SYMMETRY-BREAKING
BERRY PHASE
SKYRMIONS
HETEROSTRUCTURES
Issue Date: 16-Nov-2020
Publisher: WILEY-V C H VERLAG GMBH
Citation: Lim, Zhi Shiuh, Li, Changjian, Huang, Zhen, Chi, Xiao, Zhou, Jun, Zeng, Shengwei, Omar, Ganesh Ji, Feng, Yuan Ping, Rusydi, Andrivo, Pennycook, Stephen John, Venkatesan, Thirumalai, Ariando, Ariando (2020-11-16). Emergent Topological Hall Effect at a Charge-Transfer Interface. SMALL 16 (50). ScholarBank@NUS Repository. https://doi.org/10.1002/smll.202004683
Abstract: Exploring exotic interface magnetism due to charge transfer and strong spin-orbit coupling has profound application in the future development of spintronic memory. Here, the emergence and tuning of topological Hall effect (THE) from a CaMnO3/CaIrO3/CaMnO3 trilayer structure are studied in detail, which suggests the presence of magnetic Skyrmion-like bubbles. First, by tilting the magnetic field direction, the evolution of the Hall signal suggests a transformation of Skyrmions into topologically-trivial stripe domains, consistent with behaviors predicted by micromagnetic simulations. Second, by varying the thickness of CaMnO3, the optimal thicknesses for the THE signal emergence are found, which allow identification of the source of Dzyaloshinskii–Moriya interaction (DMI) and its competition with antiferromagnetic superexchange. Employing high-resolution transmission electron microscopy, randomly distributed stacking faults are identified only at the bottom interface and may avoid mutual cancellation of DMI. Last, a spin-transfer torque experiment also reveals a low threshold current density of ≈109 A m−2 for initiating the bubbles’ motion. This discovery sheds light on a possible strategy for integrating Skyrmions with antiferromagnetic spintronics.
Source Title: SMALL
URI: https://scholarbank.nus.edu.sg/handle/10635/229661
ISSN: 16136810
16136829
DOI: 10.1002/smll.202004683
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