journal article·2013-12-23

Epitaxial Bi5Ti3FeO15–CoFe2O4 Pillar–Matrix Multiferroic Nanostructures

Akira Imai, Xuan Cheng, Huolin L. Xin, Eugene A. Eliseev, Anna N. Morozovska, Sergei V. Kalinin, Ryota Takahashi, Mikk Lippmaa, Yuji Matsumoto, Valanoor Nagarajan

ACS Nano· Volume 7· Issue 12
Publisher page

Abstract

Epitaxial self-assembled ferro(i)magnetic spinel (CoFe2O4 (CFO)) and ferroelectric bismuth layered perovskite (Bi5Ti3FeO15 (BTFO)) pillar-matrix nanostructures are demonstrated on (001) single-crystalline strontium titanate substrates. The CFO remains embedded in the BTFO matrix as vertical pillars (∼50 nm in diameter) up to a volume fraction of 50%. Piezoresponse force microscopy experiments evidence a weak out-of-plane and a strong in-plane ferroelectricity in the BTFO phase, despite previously reported paraelectricity along the c-axis in a pure BTFO film. Phenomenological Landau-Ginzburg-Devonshire-based thermodynamic computations show that the radial stress induced by the CFO nanopillars can influence these ferroelectric phases, thus signifying the importance of the nanopillars. The CFO pillars demonstrate robust ferromagnetic hysteresis loops with little degradation in the saturation magnetization (ca. 4 μB/f.u.). Thus BTFO-CFO nanocomposites show significant promise as a lead-free magnetoelectric materials system.
Source: openalex_inverted_index · Quality: baseline

Research context

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

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

Affiliations

Materials and Structures Laboratory, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku Yokohama 226-8503, Japan

School of Materials Science and Engineering, University of New South Wales, Sydney, NSW 2052, Australia

Center for Functional Nanomaterials, Brookhaven National Laboratory, Upton, New York 11973, United States

Institute of Physics, Institute for Problems of Material Sciences, National Academy of Sciences of Ukraine, 03028 Kiev, Ukraine

The Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States

Institute for Solid State Physics, University of Tokyo, Kashiwanoha 5-1-5, Kashiwa, Chiba 277-8581, Japan

Department of Applied Chemistry, School of Engineering, Tohoku University, 6-6-07 Aramaki Aza Aoba, Aoba-ku Sendai, 980-8579 Japan

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