Magnetoelectric coupling of multiferroic chromium doped barium titanate thin film probed by magneto-impedance spectroscopy

被引：15
|
作者：
Shah, Jyoti [1 ]
Kotnala, Ravinder K. [1 ]
机构：
[1] CSIR Natl Phys Lab, Multiferro & Magnet Lab, New Delhi 110012, India
来源：
APPLIED PHYSICS LETTERS | 2014年 / 104卷 / 14期
关键词：
COMPOSITES;
D O I：
10.1063/1.4870263
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
Thin film of BaTiO3 doped with 0.1 at.% Cr (Cr:BTO) has been prepared by pulsed laser deposition technique. Film was deposited on Pt/SrTiO3 substrate at 500 degrees C in 50 mTorr Oxygen gas pressure using KrF (298 nm) laser. Polycrystalline growth of single phase Cr: BTO thin film has been confirmed by grazing angle X-ray diffraction. Cr: BTO film exhibited remnant polarization 6.4 mu C/cm(2) and 0.79 MV/cm coercivity. Magnetization measurement of Cr: BTO film showed magnetic moment 12 emu/cc. Formation of weakly magnetic domains has been captured by magnetic force microscopy. Theoretical impedance equation fitted to experimental data in Cole-Cole plot for thin film in presence of transverse magnetic field resolved the increase in grain capacitance from 4.58 x 10(-12) to 5.4 x 10(-11) F. Film exhibited high value 137 mV/cm-Oe magneto-electric (ME) coupling coefficient at room temperature. The high value of ME coupling obtained can reduce the typical processing steps involved in multilayer deposition to obtain multiferrocity in thin film. Barium titanate being best ferroelectric material has been tailored to be multiferroic by non ferromagnetic element, Cr, doping in thin film form opens an avenue for more stable and reliable spintronic material for low power magnetoelectric random excess memory applications. (C) 2014 AIP Publishing LLC.
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页数：5
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