journal article·2022-09-27

Tunable Magnetism and Morphology of Ferromagnetic Nanocups in Perovskite Ferroelectric Films via Co Exsolution of Transition Metals

Hyunji An, Jeong-Kyu Kim, Soon-Gil Jung, Sangmo Kim, Kyeongho Na, Jiwoong Yang, Jaesun Song, Tuson Park, Chung Wung Bark, Sooran Kim, Kyung-Tae Ko, Bongjae Kim, Sanghan Lee

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Abstract

In complex oxides, delicate tuning of the dimension, scale, shape, and stability of nanostructures is essential to obtain the emergent properties, which are not commonly attained when using the typical thin film growth process. Herein, we demonstrate that the exsolution process, which is modulated by simple doping control, is an efficient method to achieve tunable magnetism and the morphology of nanocups in perovskite ferroelectric Bi3.25La0.75Ti3O12 (BLT) thin films. The multimodal structural and magnetic analyses verify that the codoping of Co and Fe reinforces the phase-separated unique nanocup formation, which is revealed to be a CoFe2O4 spinel ferrimagnet. By employing density functional theory calculations, we show that different doping combinations change the relative exsolution energies of Co and Fe, which may result in the selective formation of nanocup structures. Our study presents a simple and effective methodology for the engineering of nanostructure and multifunctionality in nanocomposite films.
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Research context

OpenAlex topics: Ferroelectric and Piezoelectric Materials · Multiferroics and related materials · Magnetic and transport properties of perovskites and related materials

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

Affiliations

School of Materials Science and Engineering, Gwangju Institute of Science and Technology, Gwangju 61005, Republic of Korea

Max Planck POSTECH/Hsinchu Center for Complex Phase Materials & Department of Physics, Pohang University of Science and Technology, Pohang 37673, Republic of Korea

Center for Quantum Materials and Superconductivity (CQMS), Department of Physics, Sungkyunkwan University, Suwon, 16419, Republic of Korea

School of Intelligent Mechatronics Engineering, Sejong University, Seoul 05006, Republic of Korea

Department of Electrical Engineering, Gachon University, Seongnam 13120, Republic of Korea

Department of Physics Education, Kyungpook National University, Daegu 41566, Republic of Korea

Research Center for Materials Analysis, Korea Basic Science Institute, Daejeon 34133, Republic of Korea

Department of Physics, Kunsan National University, Gunsan 54151, Republic of Korea

Funding

National Research Foundation of Korea · Korea Institute of Science and Technology Information · Korea Basic Science Institute

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