DataVXAdvanced Functional MaterialsPaper
journal article·2024-09Open access

Strain‐Modulated Ferromagnetism at an Intrinsic van der Waals Heterojunction

Ryuji Fujita, Gautam Gurung, Mohamad‐Assaad Mawass, Alevtina Smekhova, Florian Kronast, Alexander Kang‐Jun Toh, Anjan Soumyanarayanan, Pin Ho, Angadjit Singh, Emily Heppell, Dirk Backes, Francesco Maccherozzi, Kenji Watanabe, Takashi Taniguchi, Daniel A. Mayoh, Geetha Balakrishnan, Gerrit van der Laan, Thorsten Hesjedal

Advanced Functional Materials· Volume 34· Issue 36
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Source abstract

Abstract

Abstract The van der Waals interaction enables atomically thin layers of exfoliated 2D materials to be interfaced in heterostructures with relaxed epitaxy conditions, however, the ability to exfoliate and freely stack layers without any strain or structural modification is by no means ubiquitous. In this work, the piezoelectricity of the exfoliated van der Waals piezoelectric α‐In2Se3 is utilized to modify the magnetic properties of exfoliated Fe3GeTe2, a van der Waals ferromagnet, resulting in increased domain wall density, reductions in the transition temperature ranging from 5 to 20 K, and an increase in the magnetic coercivity. Structural modifications at the atomic level are corroborated by a comparison to a graphite/α‐In2Se3 heterostructure, for which a decrease in the Tuinstra‐Koenig ratio is found. Magnetostrictive ferromagnetic domains are also observed, which may contribute to the enhanced magnetic coercivity. Density functional theory calculations and atomistic spin dynamic simulations show that the Fe3GeTe2 layer is compressively strained by 0.4%, reducing the exchange stiffness and magnetic anisotropy. The incorporation of α‐In2Se3 may be a general strategy to electrostatically strain interfaces within the paradigm of hexagonal boron nitride‐encapsulated heterostructures, for which the atomic flatness is both an intrinsic property and paramount requirement for 2D van der Waals heterojunctions.
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Research context

Nanomaterials

OpenAlex topics: 2D Materials and Applications · MXene and MAX Phase Materials · Graphene research and applications

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Clarendon Laboratory Department of Physics University of Oxford Parks Road Oxford OX1 3PU UK

Trinity College University of Oxford Oxford OX1 3BH UK

Helmholtz‐Zentrum Berlin für Materialien und Energie Albert‐Einstein‐Strasse 15 12489 Berlin Germany

Institute of Materials Research and Engineering (IMRE),Agency for Science, Technology and Research (A*STAR) 2 Fusionopolis Way, Innovis #08‐03 Singapore 138634 Singapore

Department of Physics National University of Singapore 2 Science Drive 3 Singapore 117551 Singapore

Diamond Light Source Harwell Science and Innovation Campus Didcot OX11 0DE UK

STFC/ISIS Rutherford Appleton Laboratory Didcot OX11 0QX UK

Research Center for Electronic and Optical Materials National Institute for Materials Science 1‐1 Namiki Tsukuba 305‐0044 Japan

Research Center for Materials Nanoarchitectonics National Institute for Materials Science 1‐1 Namiki Tsukuba 305‐0044 Japan

Department of Physics University of Warwick Coventry CV4 7AL UK

Funding

Ministry of Education, Culture, Sports, Science and Technology · Engineering and Physical Sciences Research Council · Helmholtz-Zentrum Berlin für Materialien und Energie · Diamond Light Source · Ministry of Education - Singapore · Earth Observatory of Singapore · Japan Society for the Promotion of Science London · Deutsche Forschungsgemeinschaft

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