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钙钛矿超晶格中蕴含着丰富的磁现象, 特别是锰酸镧/镍酸镧超晶格中的异常磁交换偏置现象是一个研究热点. 本文采用脉冲激光沉积技术, 制备出不同取向的锰酸镧/镍酸镧超晶格, 并对超晶格的电输运性能和交换偏置现象进行了系统的研究. 实验发现, 超晶格在不同取向的衬底上外延生长并保持晶格应力; 超晶格的母体是Mott绝缘体并遵循二维Mott变程跃迁导电机理; 不同取向的超晶格都表现出交换偏置现象; 场冷和零场冷曲线表明在低温下超晶格中存在两种不同的磁性组元. 对超晶格交换场强度的进一步分析发现, 交换场强度与超晶格的取向以及超晶格与衬底界面处的极性补偿有关. 在不同温度下都观察到, 极性连续的超晶格的交换场强度都高于极性失配的超晶格. 上述研究结果对进一步理解钙钛矿超晶格中的磁电输运性能有所帮助.Perovskite superlattices have received enormous attention in recent years, for they possess several new phases of quantum matter. In particular, an unexpected exchange bias effect in (111)-oriented superlattices composed of ferromagnetic LaMnO3 and paramagnetic LaNiO3 is observed, which has aroused broad interest. In this work, three kinds of LaMnO3/LaNiO3 superlattices with (001), (110), and (111) out-of-plane orientation are fabricated by pulsed laser deposition, and also studied systemically. It is found that the superlattices are epitaxially grown on the SrTiO3 substrates without strain relaxation. The superlattices have a monolayer terraced structure with a surface roughness below 0.1 nm. Electrical transport measurements reveal a Mott conducting behavior with strong localization of electrons in the superlattices. All the superlattices with different orientations exhibit exchange bias phenomenon. The field cooling and zero field cooling curves indicate that there are two different magnetic components in the superlattice in a low temperature range. Further analysis of the values of exchange field reveals that the exchange bias field is related to the orientation and polarity of the superlattices. Different superlattices form different charged planes stacked along out-of-plane orientation, leading to a polarity match/mismatch at the interface between the superlattices and substrates. The surface reconstructions that act as compensating for the polar mismatch influence the exchange bias field of the superlattices. It is observed that the intensities of the exchange field of the polar-matched superlattices are higher than those of the polar-mismatched superlattices at different temperatures. These results are helpful in further understanding the magnetoelectric transport properties in the perovskite superlattices.
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Keywords:
- perovskite /
- superlattice /
- epitaxial growth /
- exchange bias
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图 1 (a) 生长在STO (110) 衬底上的LMO/LNO超晶格AFM图; (b) 超晶格表面线扫描图
Fig. 1. (a) AFM image of LMO/LNO superlattice on STO (110) substrate; (b) line-scan of superlattice.
图 2 (110) 取向的超晶格在(a) (110) 对称峰 和 (b) (321) 非对称峰附近的倒易空间图
Fig. 2. Reciprocal space maps of (110)-oriented superlattice around the (a) symmetric (110) and (b) asymmetric (321) reflexes.
图 3 (a) (110) 取向超晶格的变温电阻率曲线; (b) 方块电导率与温度的函数关系式, 其中虚线是线性拟合
Fig. 3. (a) Temperature dependence of the sheet resistance of (110)-oriented superlattice; (b) logarithm of sheet conductance ln (σ) as a function of T –1/3, where the red line is linear fitting.
图 4 不同温度下 (110) 取向超晶格的磁滞回线(1 emu = 10–3 A·m2), 被测样品在1 T磁场下冷却
Fig. 4. Hysteresis loops for the (110)-oriented superlattice at different constant temperatures after cooling the sample with a field of 1 T.
图 5 场冷和零场冷下 (110) 取向超晶格的变温磁矩曲线, 插图是50 K以下的局部放大图
Fig. 5. Magnetic moment versus temperature of (110)-oriented superlattice in the ZFC and FC states. The inset is the zoom-in below 50 K.
图 6 不同取向超晶格交换场强对比图
Fig. 6. Comparison of exchange bias field of superlattices with different orientations.
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[1] Wei H M, Yang C, Wu Y Q, Cao B Q, Lorenz M, Grundmann M 2020 J. Mater. Chem. C 8 15575
Google Scholar
[2] 姚鑫, 丁艳丽, 张晓丹, 赵颖 2015 物理学报 64 038805
Google Scholar
Yao X, Ding Y L, Zhang X D, Zhao Y 2015 Acta Phys. Sin. 64 038805
Google Scholar
[3] Pena M A, Fierro J L 2001 Chem. Rev. 101 1981
Google Scholar
[4] Cherniukh I, Raino G, Stoferle T, et al. 2021 Nature 593 535
Google Scholar
[5] Noguchi Y, Matsuo H 2021 Nanomaterials 11 1857
Google Scholar
[6] Liu Y, Siron M, Lu D, Yang J J, dos Reis R, Cui F, Gao M Y, Lai M L, Lin J, Kong Q, Lei T, Kang J, Jin J B, Ciston J, Yang P D 2019 J. Am. Chem. Soc. 141 13028
Google Scholar
[7] Haislmaier R C, Lapano J, Yuan Y K, Stone G, Dong Y Q, Zhou H, Alem N, Engel-Herbert R 2018 APL Mater. 6 111104
Google Scholar
[8] Brahlek M, Sen Gupta A, Lapano J, Roth J, Zhang H T, Zhang L, Haislmaier R, Engel-Herbert R 2018 Adv. Funct. Mater. 28 1702772
Google Scholar
[9] Wei H M, Jenderka M, Bonholzer M, Grundmann M, Lorenz M 2015 Appl. Phys. Lett. 106 042103
Google Scholar
[10] 周龙, 王潇, 张慧敏, 申旭东, 董帅, 龙有文 2018 物理学报 67 157505
Google Scholar
Zhou L, Wang X, Zhang H M, Shen X D, Dong S, Long Y W 2018 Acta Phys. Sin. 67 157505
Google Scholar
[11] Yamasaki Y, Okuyama D, Nakamura M, et al. 2011 J. Phys. Soc. Jpn. 80 073601
Google Scholar
[12] 张鹏, 朴红光, 张英德, 黄焦宏 2021 物理学报 70 157501
Google Scholar
Zhang P, Piao H G, Zhang Y D, Huang J H 2021 Acta Phys. Sin. 70 157501
Google Scholar
[13] Ouellette D G, Lee S B, Son J, Stemmer S, Balents L, Millis A J, Allen S J 2010 Phys. Rev. B 82 165112
Google Scholar
[14] Gibert M, Zubko P, Scherwitzl T, Iniguez J, Triscone J M 2012 Nat. Mater. 11 195
Google Scholar
[15] Dong S, Dagotto E 2013 Phys. Rev. B 87 195116
Google Scholar
[16] Piamonteze C, Gibert M, Heidler J, et al. 2015 Phys. Rev. B 92 014426
Google Scholar
[17] Lee A T, Han M J 2013 Phys. Rev. B 88 035126
Google Scholar
[18] Wei H M, Barzola-Quiquia J L, Yang C, et al. 2017 Appl. Phys. Lett. 110 102403
Google Scholar
[19] Zang J L, Zhou G W, Bai Y H, Quan Z Y, Xu X H 2017 Sci. Rep. 7 10557
Google Scholar
[20] Pan S Y, Shi L, Zhao J Y, Zhou S M, Xu X M 2018 Appl. Phys. Lett. 112 141602
Google Scholar
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Google Scholar
[22] Zhang J, Zhou J T, Luo Z L, Chen Y B, Zhou J, Lin W W, Lu M Hm Zhang S T, Gao C, Wu D, Chen Y F 2020 Phys. Rev. B 101 014422
Google Scholar
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Google Scholar
[24] Brenig W 1973 Philos. Mag. 27 1093
Google Scholar
[25] Khan Z H, Husain M, Perng T P, Salh N, Habib S 2008 J. Phys. Condens. Matter 20 475207
Google Scholar
[26] Hoffman J, Tung I C, Nelson-Cheeseman B B, Liu M, Freeland J W, Bhattacharya A 2013 Phys. Rev. B 88 144411
Google Scholar
[27] Kawai M, Inoue S, Mizumaki M, Kawamura N, Ichikawa N, Shimakawa Y 2009 Appl. Phys. Lett. 94 082102
Google Scholar
[28] Wei H M, Grundmann M, Lorenz M 2016 Appl. Phys. Lett. 109 082108
Google Scholar
[29] Liu J, Kareev M, Prosandeev S, Gray B, Ryan P, Feeland J W, Chakhalian J 2010 Appl. Phys. Lett. 96 133111
Google Scholar
[30] Chakraverty S, Saito M, Tsukimoto S, Ikuhara Y, Ohtomo A, Kawasaki M 2011 Appl. Phys. Lett. 99 223101
Google Scholar
[31] Middey S, Meyers D, Kareev M, Moon E J, Gray B A, Liu X, Freeland J W, Chakhalian J 2012 Appl. Phys. Lett. 101 261602
Google Scholar
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