journal article·2020-12-16Open access

Modulating Magnetism in Ferroelectric Polymer-Gated Perovskite Manganite Films with Moderate Gate Pulse Chains

Hon Fai Wong, Sheung Mei Ng, Wen Zhang, Yu Kuai Liu, Ping Kwan Johnny Wong, Chi Sin Tang, Ka Kin Lam, Xu Wen Zhao, Zhen Gong Meng, Lin Feng Fei, Wang Fai Cheng, Danny von Nordheim, Wai Yeung Wong, Zong Rong Wang, Bernd Ploss, Ji-Yan Dai, Chee Leung Mak, Andrew Thye Shen Wee, Chi Wah Leung

ACS Applied Materials & Interfaces· Volume 12· Issue 50

Abstract

Most previous attempts on achieving electric-field manipulation of ferromagnetism in complex oxides, such as La0.66Sr0.33MnO3 (LSMO), are based on electrostatically induced charge carrier changes through high-k dielectrics or ferroelectrics. Here, the use of a ferroelectric copolymer, polyvinylidene fluoride with trifluoroethylene [P(VDF-TrFE)], as a gate dielectric to successfully modulate the ferromagnetism of the LSMO thin film in a field-effect device geometry is demonstrated. Specifically, through the application of low-voltage pulse chains inadequate to switch the electric dipoles of the copolymer, enhanced tunability of the oxide magnetic response is obtained, compared to that induced by ferroelectric polarization. Such observations have been attributed to electric field-induced oxygen vacancy accumulation/depletion in the LSMO layer upon the application of pulse chains, which is supported by surface-sensitive-characterization techniques, including X-ray photoelectron spectroscopy and X-ray magnetic circular dichroism. These techniques not only unveil the electrochemical nature of the mechanism but also establish a direct correlation between the oxygen vacancies created and subsequent changes to the valence states of Mn ions in LSMO. These demonstrations based on the pulsing strategy can be a viable route equally applicable to other functional oxides for the construction of electric field-controlled magnetic devices.
Source: europepmc · Quality: candidate unverified · Source record ↗

Research context

OpenAlex topics: Magnetic and transport properties of perovskites and related materials · Multiferroics and related materials · Perovskite Materials and Applications

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

Affiliations

Department of Applied Physics, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China

School of Electronics and Information and School of Microelectronics, Northwestern Polytechnical University, 127 West Youyi Road, Xi’an, Shaanxi 710072, China

Department of Physics, National University of Singapore, 2 Science Drive 3, Singapore 117542, Singapore

Centre for Advanced 2D Materials and Graphene Research Centre, National University of Singapore, 6 Science Drive 2, Singapore 117546, Singapore

College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen 518060, China

Department of SciTec, University of Applied Sciences Jena, Carl-Zeiss-Promenade 2, 07743 Jena, Germany

Department of Applied Biology and Chemical Technology, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China

State Key Lab of Silicon Materials, School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China

Funding

Research Grants Council, University Grants Committee · Ministry of Education of the People's Republic of China · Ministry of Education - Singapore · National Natural Science Foundation of China · Hong Kong Polytechnic University

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