Ferroic phase transitions and magnetoelectric coupling in cobalt doped BaTiO3

被引:19
作者
Pradhan, Dhiren K. [1 ,2 ]
Mohanty, Hari Sankar [3 ]
Kumari, Shalini [4 ,5 ]
Bhoi, Krishnamayee [3 ]
Tang, Nan [1 ,2 ]
Ravikant [9 ,10 ]
Rahaman, M. M. [7 ]
Pradhan, Dillip K. [3 ]
Kumar, Ashok [6 ]
Gilbert, Dustin A. [1 ,8 ]
Rack, Philip D. [1 ,2 ]
机构
[1] Univ Tennessee, Dept Mat Sci & Engn, Knoxville, TN 37996 USA
[2] Oak Ridge Natl Lab, Ctr Nanophase Mat Sci, Oak Ridge, TN 37831 USA
[3] Natl Inst Technol, Dept Phys & Astron, Rourkela 769008, India
[4] Penn State Univ, Dept Mat Sci & Engn, University Pk, PA 16802 USA
[5] Penn State Univ, Dept Phys, University Pk, PA 16802 USA
[6] Natl Phys Lab CSIR, Dr KS Krishnan Marg, New Delhi 110012, India
[7] Univ Rajshahi, Dept Mat Sci & Engn, Rajshahi 6205, Bangladesh
[8] Univ Tennessee, Dept Phys & Astron, Knoxville, TN 37996 USA
[9] GIET Univ, Dept Basic Sci & Humanities, Gunupur 765022, Odisha, India
[10] Vikram Univ, Govt Coll Sailana, Dept Phys, Ujjain 457550, Madhya Pradesh, India
关键词
KTA1-XNBXO3; SINGLE-CRYSTALS; DIELECTRIC-PROPERTIES; RAMAN-SCATTERING; RELAXATION; DYNAMICS; DOMAIN; OXYGEN; FILMS;
D O I
10.1039/d1tc02961d
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Magnetoelectric (ME) materials exhibit interesting physics with cross coupling between ferroelectric and magnetic order parameters and thus strong potential to be utilized in memory, spintronics and other multifunctional electronic/magnetic devices. Doping of suitable transition metals in ferroelectrics can induce magnetism and ME coupling and modify the physical properties. Here, we report the structural, electronic, magnetic and ME coupling of 3.5, 5 and 7.5 mol% cobalt doped BaTiO3 (BTO) ceramics. X-ray diffraction and Raman spectroscopy indicate that the samples are single phase having a tetragonal crystal structure with P4mm symmetry. The tetragonality ratio is found to decrease with increasing cobalt content. We observed a Fano-like asymmetric peak in the [A(1)(LO1)] Raman mode at similar to 173 cm(-1) in all the cobalt doped BTO samples. The cobalt dopants are shown to be uniformly distributed throughout the surface of the samples. We observed a lowering of the ferroelectric transition temperature and increasing diffusivity parameter with increasing cobalt concentration. The electrical properties of all the samples have been investigated in detail by impedance spectroscopy and ac conductivity studies before and after the ferroelectric phase transitions. All the samples show hysteretic ferroelectric behavior with a clear saturation state that decreases with increasing cobalt content. The observed ferroelectricity in these samples is intrinsic in nature. The 3.5% cobalt doped BTO sample exhibits paramagnetic behavior whereas the 5 and 7.5% cobalt doped BTO samples show ferromagnetic ordering below 43 K. The 7.5% cobalt doped BTO samples show significant ME coupling.
引用
收藏
页码:12694 / 12711
页数:18
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