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Issue 3, 2018
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Single-crystalline Gd-doped BiFeO3 nanowires: R3c-to-Pn21a phase transition and enhancement in high-coercivity ferromagnetism

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Abstract

We fabricated single-crystalline, Gd-doped BiFeO3 (BFO) nanowires using a hydrothermal technique. X-ray diffraction (XRD) data combined with their Rietveld refinements and high-resolution transmission electron microscopy (HRTEM) revealed pure single-phase crystalline Bi1−xGdxFeO3 (x = 0, 0.05, 0.10) nanowires of 40–60 nm diameter and their structural transformation from the rhombohedral R3c (for x = 0 and 0.05) to the orthorhombic Pn21a crystal structure (for x = 0.10). The addition of Gd3+ ions to the pure-phase BFO leads to remarkable changes in the structural and magnetic properties, and these effects are caused by differences in the ionic-radii and magnetic moment between the Bi3+ and Gd3+ ions. According to the observed magnetization-field (M–H) and magnetization-temperature (MT) curves, with increasing Gd3+ concentration, the saturation magnetization (MS), squareness (Mr/MS), coercivity (HC), exchange-bias field (HEB) and magnetocrystalline anisotropy (K) increased markedly, by MS = 1.26 emu g−1 (640%), Mr/MS = 0.19 (20.5%), HC = 7788 Oe (4560%), HEB = 501 Oe (880%) and K = 1.62 × 105 erg cm−3 (3500%), for x = 0.10 relative to the data for x = 0. In such Gd-doped BFO nanowire samples, spin-canted Dzyaloshinskii–Moriya interaction, remarkable enhancements in the magnetocrystalline anisotropy as well as uncompensated surface ferromagnetic spin states in the antiferromagnetic core regions were also found. Such remarkable enhancements in Gd-doped BFO nanowires might offer a variety of spintronic applications.

Graphical abstract: Single-crystalline Gd-doped BiFeO3 nanowires: R3c-to-Pn21a phase transition and enhancement in high-coercivity ferromagnetism

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Publication details

The article was received on 22 Nov 2017, accepted on 11 Dec 2017 and first published on 11 Dec 2017


Article type: Paper
DOI: 10.1039/C7TC05362B
Citation: J. Mater. Chem. C, 2018,6, 526-534
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    Single-crystalline Gd-doped BiFeO3 nanowires: R3c-to-Pn21a phase transition and enhancement in high-coercivity ferromagnetism

    S. K. S. Patel, J. Lee, M. Kim, B. Bhoi and S. Kim, J. Mater. Chem. C, 2018, 6, 526
    DOI: 10.1039/C7TC05362B

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