Gupta, Rekha and Chaudhary, Sujeet and Kotnala, R. K. (2015) Interfacial Charge Induced Magnetoelectric Coupling at BiFeO3/BaTiO3 Bilayer Interface. ACS Applied Materials and Interfaces, 7 (16). 8472 -8479. ISSN 1944-8244

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Bilayer thin films of BiFeO3BaTiO3 at different thicknesses of BiFeO3 were prepared by RF-magnetron sputtering technique. A pure phase polycrystalline growth of thin films was confirmed from XRD results. Significantly improved ferroelectric polarization (2P(r) similar to 30 mu C/cm(2)) and magnetic moment (M-ss similar to 33 emu/cc) were observed at room temperature. Effect of ferroelectric polarization on current conduction across the interface has been explored. Accumulation and depletion of charges at the bilayer interface were analyzed by currentvoltage measurements which were further confirmed from hysteretic dynamic resistance and capacitance voltage profiles. Magnetoelectric coupling due to induced charges at grain boundaries of bilayer interface was further investigated by room temperature magnetocapacitance analysis. A room temperature magnetocapacitance was found to originate from induced charge at the bilayer interface which can be manipulated by varying the thickness of BFO to obtain higher ME coupling coefficient. Dynamic magnetoelectric coupling was investigated, and maximum longitudinal magnetoelectric coupling was observed to be 61 mV/cm Oe at 50 nm thickness of BiFeO3. The observed magnetoelectric properties are potentially useful for novel room temperature magnetoelectric and spintronic device applications.

Item Type: Article
Uncontrolled Keywords: ferroelectric, ferromagnetic, multiferroic, magnetocapacitance, magnetoelectric coupling
Subjects: Materials Science
Nanoscience/ Nanotechnology
Depositing User: Dr. Rajpal Walke
Date Deposited: 28 Sep 2016 06:08
Last Modified: 28 Sep 2016 06:08

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