The Effect of Depolarization Field on Ferroelectric and Dielectric Properties of Ba0.5Sr0.5TiO3 Epitaxial Thin Films

ZHANG Xiangui; NA Mula; SONG Jianmin; YANG Fan

doi:10.6054/j.jscnun.2022019

Journal of South China Normal University (Natural Science Edition) > 2022 > 54(2): 7-12. > DOI: 10.6054/j.jscnun.2022019

ZHANG Xiangui, NA Mula, SONG Jianmin, YANG Fan. The Effect of Depolarization Field on Ferroelectric and Dielectric Properties of Ba_0.5Sr_0.5TiO₃ Epitaxial Thin Films[J]. Journal of South China Normal University (Natural Science Edition), 2022, 54(2): 7-12. DOI: 10.6054/j.jscnun.2022019

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The Effect of Depolarization Field on Ferroelectric and Dielectric Properties of Ba_0.5Sr_0.5TiO₃ Epitaxial Thin Films

1.
School of Bohai, Hebei Agricultural University, Cangzhou 061100, China
2.
School of Materials, Yanshan University, Qinhuangdao 066000, China

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Received Date: November 17, 2021
Available Online: May 11, 2022

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Abstract

Abstract

Based on the Ginzburg-Landau-Devonshire phenomenological theory, the thickness-dependent ferroelectric and dielectric properties with and without depolarization field in epitaxial Ba_0.5Sr_0.5TiO₃ films were qualitatively studied. The results show that, compared with non-depolarization field, depolarization field makes the spatial distribution of polarization more uniform and inhibits the average polarization of the system, with the phase transition temperature (ΔT_c) reduced but the critical thickness (Δh_c, Δh_m), and tunability (Δφ) increased, especially in the case of weak electrode compensation. With the 100-nm-thickness thin film, the values of ΔT_c、Δh_c、Δh_m and Δφ are about -57.5 ℃, 15 nm, 40 nm and 20%, respectively. Moreover, the dielectric properties of epitaxial films depend on the ability of polarization to respond to external applied electric field rather than polarization itself, which can be fully proved by the completely opposite trends of thickness-dependent polarization and tunability.
- ferroelectric thin film,
- depolarization field,
- thickness,
- tunability

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References (27)

References

[1]	KWAMEN C, ROESSLE M, LEITENBERGER W, et al. Time-resolved X-ray diffraction study of the structural dynamics in an epitaxial ferroelectric thin Pb(Zr_0.2Ti_0.8)O₃ film induced by sub-coercive fields[J]. Applied Physics Letters, 2019, 114(16): 162907/1-5.
[2]	CHEN Z F, WANG Y D, ZHENG D F, et al. Polarization tunable and enhanced photovoltaic properties in tetragonal-like BiFeO₃ epitaxial films with graphene top electrode[J]. Journal of Alloys and Compounds, 2019, 811(30): 152013/1-6.
[3]	LIU Y, INFANTE I C, LOU X, et al. Giant room-temperature elastocaloric effect in ferroelectric ultrathin films[J]. Advanced Materials, 2014, 26(35): 6132-6137. doi: 10.1002/adma.201401935
[4]	陈文烁, 孟耀勇, 顾凤龙. 钛酸锶钡拉曼光谱的理论计算与实验研究[J]. 华南师范大学学报(自然科学版), 2019, 51(6): 18-23. doi: 10.6054/j.jscnun.2019098 CHEN W S, MENG Y Y, GU F L. Theoretical and experimental studies of roman spectroscopy of barium strontium titanate[J]. Journal of South China Normal University (Natural Science Edition), 2019, 51(6): 18-23. doi: 10.6054/j.jscnun.2019098
[5]	ZHANG Q A, XIAO X D, WANG J, et al. Effects of epitaxial strain, film thickness and electric-field frequency on the ferroelectric behavior of BaTiO₃ nano films[J]. International Journal of Solids and Structures, 2018, 144/145: 32-45. doi: 10.1016/j.ijsolstr.2018.04.012
[6]	LICHTENSTEIGER C, TRISCONE J M, JUNQUERA J, et al. Ferroelectricity and tetragonality in ultrathin PbTiO₃ films[J]. Physical Review Letters, 2005, 94: 047603/1-4.
[7]	HONG L, SOH A K, SONG A K, et al. Interface and surface effects on ferroelectric nano-thin films[J]. Acta Materialia, 2008, 56(13): 2966-2974. doi: 10.1016/j.actamat.2008.02.034
[8]	ZHONG W L, WANG C L, ZHANG P L, et al. Phenomenological study of the size effect on phase transitions in ferroelectric particles[J]. Physical Review B, 1994, 50: 698-703.
[9]	WANG J, ZHANG T Y. Influence of depolarization field on polarization states in epitaxial ferroelectric thin films with nonequally biaxial misfit strains[J]. Physical Review B, 2008, 77(1): 014104/1-7.
[10]	MANTESE J V, ALPAY S P. Graded ferroelectrics, transpacitors and transponents[M]. New York: Springer, 2005.
[11]	MA W, ZHONG J, JIAN W. Curie phase transition and critical size for ferroelectricity in strained ultrathin PbTiO₃ and BaTiO₃: a phenomenological study[J]. Ferroelectrics, 2017, 507(1): 86-101. doi: 10.1080/00150193.2017.1283554
[12]	LIU G, NAN C W. Thickness dependence of polarization in ferroelectric perovskite thin films[J]. Journal of Physics D: Applied Physics, 2005, 38(4): 584-589. doi: 10.1088/0022-3727/38/4/010
[13]	HU Z S, TANG M H, WANG J B, et al. Effect of extrapolation length on the phase transformation of epitaxial ferroelectric thin films[J]. Physica B: Condensed Matter, 2008, 403(19/20): 3700-3704.
[14]	GLINCHUK M D, ZAULYCHNY B Y, STEPHANOVICH V A. Depolarization field in thin ferroelectric films with account of semiconductor electrodes[J]. Ferroelectrics: Letters Section, 2005, 316(11): 1-6.
[15]	KIM H J, OH S H, JANG H M. Thermodynamic theory of stress distribution in epitaxial Pb(Zr, Ti)O₃ thin films[J]. Applied Physics Letters, 1999, 75(20): 3195-3197. doi: 10.1063/1.125275
[16]	WANG X S, WANG C L, ZHONG W L, et al. The effects of uniaxial stress distribution on the ferroelectric properties of thin films with first-order phase transition[J]. Solid State Communications, 2002, 121(2/3): 111-115.
[17]	ZHOU H, HONG J W, ZHANG Y L, et al. Flexoelectricity induced increase ofcritical thickness in epitaxial ferroelectric thin films[J]. Physica B: Condensed Matter, 2012, 407(17): 3377-3381. doi: 10.1016/j.physb.2012.04.041
[18]	MA D C, ZHENG Y, WOO C H. Phase-field simulation of domain structure for PbTiO₃/SrTiO₃ superlattices[J]. Acta Materialia, 2009, 57(16): 4736-4744. doi: 10.1016/j.actamat.2009.06.032
[19]	PALOVA L, CHANDRA P, RABE K M. Modeling the dependence of properties of ferroelectric thin film on thickness[J]. Physical Review B, 2007, 76(1): 014112/1-12.
[20]	SINNAMON L J, BOWMAN R M, GREGG J M. Thickness-induced stabilization of ferroelectricity in SrRuO₃/Ba_0.5Sr_0.5TiO₃/Au thin film capacitors[J]. Applied Phy-sics Letters, 2002, 81(5): 889-891. doi: 10.1063/1.1496144
[21]	ZEMBILGOTOV A G, PERTSEV N A, KOHLSTEDT H, et al. Ultrathin epitaxial ferroelectric films grown on compressive substrates: competition between the surface and strain effects[J]. Journal of Applied Physics, 2002, 91(4): 2247-2247. doi: 10.1063/1.1427406
[22]	TAGANTSEV A K, SHERMAN V O, ASTAFIEV K F, et al. Ferroelectric materials for microwave tunable applications[J]. Journal of Electroceramics, 2003, 11(1/2): 5-66. doi: 10.1023/B:JECR.0000015661.81386.e6
[23]	JIAN Z, YIN Z, ZHANG M S. Phase structures and stability in barium titanate ferroelectric ultrathin films[J]. Physics Letters A, 2003, 310(5/6): 479-485.
[24]	GLINCHUK M D, ELISEEV E A, STEPHANOVICH V A. The depolarization field effect on the thin ferroelectric films properties[J]. Physica B, 2002, 322(3/4): 356-370.
[25]	BAN Z G, ALPAY S P. Optimization of the tunability of barium strontium titanate films via epitaxial stresses[J]. Journal of Applied Physics, 2003, 93(1): 504-511. doi: 10.1063/1.1524310
[26]	BAN Z G, ALPAY S P. Phase diagrams and dielectric response of epitaxial barium strontium titanate films: a theoretical analysis[J]. Journal of Applied Physics, 2002, 91(11): 9288-9296. doi: 10.1063/1.1473675
[27]	ITO S, YAMADA T, TAKAHASHI K, et al. Effect of bottom electrode on dielectric property of sputtered-(Ba, Sr) TiO₃ films[J]. Journal of Applied Physics, 2009, 105(1): 061606/1-4.