1. Beijing National Laboratory for Condensed Matter Physics and State Key Laboratory of Magnetism, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China; 2. School of Physics, Beijing Technology and Business University, Beijing 100048, China; 3. School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 101408, China; 4. Songshan Lake Materials Laboratory, Dongguan 523808, China; 5. Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China
Abstract The origin of ferromagnetism in epitaxial strained LaCoO3-x films has long been controversial. Here, we investigated the magnetic behavior of a series of oxygen vacancy-ordered LaCoO3-x films on different substrates. Obvious ferromagnetism was observed in perovskite LaCoO3/LSAT (LSAT = (LaAlO3)0.3(SrAlTaO6)0.7) and LaCoO3/SrTiO3 films, while LaCoO3/LaAlO3 films showed weak ferromagnetic behavior. Meanwhile, LaCoO2.67 films exhibited antiferromagnetic behavior. An unexpected low-temperature ferromagnetic phenomenon with a Curie temperature of ～ 83 K and a saturation magnetization of ～ 1.2 μB/Co was discovered in 15 nm thick LaCoO2.5/LSAT thin films, which is probably related to the change in the interface CoO6 octahedron rotation pattern. Meanwhile, the observed ferromagnetism gradually disappeared as the thickness of the film increased, indicating a relaxation of tensile strain. Analysis suggests that the rotation and rhombohedral distortion of the CoO6 octahedron weakened the crystal field splitting and promoted the generation of the ordered high-spin state of Co2+. Thus the super-exchange effect between Co2+ (high spin state), Co2+ (low spin state) and Co2+(high spin state) produced a low-temperature ferromagnetic behavior. However, compressive-strained LaCoO2.5 film on a LaAlO3 substrate showed normal anti-ferromagnetic behavior. These results demonstrate that both oxygen vacancies and tensile strain are correlated with the emergent magnetic properties in epitaxial LaCoO3-x films and provide a new perspective to regulate the magnetic properties of transition oxide thin films.
Fund: This work was supported by the National Key Research and Development Program of China (Grant Nos.2020YFA0711502 and 2019YFA0704900), the National Natural Sciences Foundation of China (Grant Nos.52088101, 51971240, and 11921004), the Key Program of the Chinese Academy of Sciences and the Strategic Priority Research Program (B) of the Chinese Academy of Sciences (Grant No.XDB33030200).
Corresponding Authors:
Jing Wang, Feng-Xia Hu, Bao-He Li
E-mail: wangjing@.iphy.ac.cn;fxhu@.iphy.ac.cn;lbhe@th.btbu.edu.cn
Cite this article:
Yang-Yang Fan(范洋洋), Jing Wang(王晶), Feng-Xia Hu(胡凤霞), Bao-He Li(李宝河), Ai-Cong Geng(耿爱丛), Zhuo Yin(殷卓), Cheng Zhang(张丞), Hou-Bo Zhou(周厚博), Meng-Qin Wang(王梦琴), Zi-Bing Yu(尉紫冰), and Bao-Gen Shen(沈保根) Low-temperature ferromagnetism in tensile-strained LaCoO2.5 thin film 2023 Chin. Phys. B 32 087504
[1] Ngai J H, Walker F J and Ahn C H 2014 Annu Rev. Mater. Res.44 1 [2] Ling Z B, Zhang Q Y, Yang C P, Li X T, Liang W S, Wang Y Q, Yang H W and Sun J R 2020 Chin. Phys. B29 096802 [3] Jeong J, Aetukuri N, Graf T, Schladt T, Samant M and Parkin S 2013 Science339 1402 [4] Imada M, Fujimori A and Tokura Y 1998 Rev. Mod. Phys.70 1039 [5] Guo E J, Desautels R, Keavney D, Roldan M A, Kirby B J, Lee D, Liao Z L, Charlton T, Herklotz A, Ward T Z, Fitzsimmons M R and Lee H N 2019 Sci. Adv.5 evav5050 [6] Fuchs D, Pinta C, Schwarz T, Schweiss P, Nagel P, Schuppler S, Schneider R, Merz M, Roth G and Löhneysen H V 2007 Phys. Rev. B75 144402 [7] Fuchs D, Arac E, Pinta C, Schuppler S, Schneider R and Löhneysen H V 2008 Phys. Rev. B77 014434 [8] Jeen H, Choi W S, Freeland J W, Ohta H, Jung C U and Lee H N 2013 Adv. Mater.25 3651 [9] Fujioka J, Yamasaki Y, Nakao H, Kumai R, Murakami Y, Nakamura M, Kawasaki M and Tokura Y 2013 Phys. Rev. Lett.111 027206 [10] Chaturvedi V, Walter J, Paul A, Grutter A, Kirby B, Jeong J S, Zhou H, Zhang Z, Yu B Q, Greven M, Mkhoyan K A, Birol T and Leighton C 2020 Phys. Rev. Mater.4 034403 [11] G J la O', Ahn S J, Crumlin E, Orikasa Y, Biegalski M D, Christen H M and Yang S H 2010 Angew. Chem. Int. Ed.49 5344 [12] Phelan D, Louca D, Kamazawa K, Lee S H, Ancona S N, Rosenkranz S, Motome Y, Hundley M F, Mitchell J F and Moritomo Y 2006 Phys. Rev. Lett.97 235501 [13] Becher C, Maurel L, Aschauer U, Lilienblum M, Magén C, Meier D, Langenberg E, Trassin M, Blasco J, Krug I P, Algarabel P A, Spaldin N A, Pardo J A and Fiebig M 2015 Nat. Nanotechnol.10 661 [14] Kalinin S V and Spaldin N A 2013 Science341 858 [15] Mehta V V, Biskup N, Jenkins C, Arenholz E, Varela M and Suzuki Y 2015 Phys. Rev. B91 144418 [16] McKee R A, Walker F J and Chisholm M F 1998 Phys. Rev. Lett.81 3014 [17] Hong X, Posadas A and Ahn C H 2005 Appl. Phys. Lett.86 142501 [18] Vogt T, Hriljac J A, Hyatt N C and Woodward P 2003 Phys. Rev. B67 140401 [19] Biskup N, Salafranca J, Mwhta V, Oxley M P, Suzuki Y, Pennycook S J, Pantelides S T and Varela M 2014 Phys. Rev. Lett.112 087202 [20] Bai Y H, Wang X, Mu L P and Xu X H 2016 Chin. Phys. Lett.33 087501 [21] Seo H, Posadas A B, Mitra C, Kvit A V, Ramdani J and Demkov A A 2012 Phys. Rev. B86 075301 [22] Sterbinsky G E, Nanguneri R, Ma J X, Shi J, Karapetrova E, Woicik J C, Park H, Kim J W and Ryan P J 2018 Phys. Rev. Lett.120 197201 [23] Feng Q Y, Meng D C, Zhou H B, Liang G H, Cui Z Z, Huang H L, Wang J L, Guo J H, Ma C, Zhai X F, Lu Q Y and Lu Y L 2019 Phys. Rev. Mater.3 074406 [24] Aschauer U, Pfenninger R, Selbach S M, Grande T and Spaldin N A 2013 Phys. Rev. B88 054111 [25] Golosova N O, Kozlenko D P, Kolesnikov A I, Yu V Kazimirov, Smirnov M B, Jirak Z and Savenko B N 2007 Phys. Rev. B83 214305 [26] Lan Q Q, Zhang X J, Shen X, Zhang J, Guan X X, Yao Y, Wang Y G, Yu R C, Peng Y and Sun J R 2015 Appl. Phys. Lett.107 242404 [27] Yokoyama Y, Yamasaki Y, Taguchi M, Hirata Y, Takubo K, Miyawaki J, Harada Y, Asakura D, Fujioka J, Nakamura M, Daimon H, Kawasaki M, Tokura Y and Wadati H 2018 Phys. Rev. Lett.120 206402 [28] Cabero M, Nagy K, Gallego F, Sander A, Rio M, Cuellar F A, Tornos J, Hernandez-Martin D, Nemes N M, Mompean F, Garcia-Hernandez M, Rivera-Calzada A, Sefrioui Z, Reyren N, Feher T, Varela M, Leon C and Santamaria J 2017 APL Mater.5 096104 [29] Zhang N B, Zhu Y L, Li D, Pan D S, Tang Y L, Han M J, Ma J Y, Wu B, Zhang Z D and Ma X L 2018 Appl. Mater. Interfaces10 38230 [30] Wei W G, Wang H, Zhang K, Liu H, Kou Y F, Chen J J, Du K, Zhu Y Y, Hou D L, Wu R Q, Yin L F and Shen J 2015 Chin. Phys. Lett.32 087504 [31] An Q C, Xu Z, Wang Z Z, Meng M, Guan M X, Meng S, Zhu X T, Guo H Z, Yang F and Guo J D 2021 Appl. Phys. Lett.118 081602 [32] Huang H L, Zhang J N, Zhang H, Han F R, Chen X B, Song J H, Zhang J, Qi S J, Chen Y S, Cai J W, Hu F X, Shen B G and Sun J R 2020 J. Phys. D53 155003 [33] Li S S, Wang J S, Zhang Q H, Roldan M A, Shan L, Jin Q, Chen S, Wu Z P, Wang C, Ge C, He M, Guo H Z, Gu L, Jin K J and Guo E J 2019 Phys. Rev. Mater.3 114409 [34] Meng D C, Guo H L, Cui Z Z, Ma C, Zhao J, Lug J B, Xu H, Wang Z C, Hu X, Fu Z P, Peng R R, Guo J H, Zhai X F, Browni G J, Knizej R and Lu Y L 2018 Proc. Natl. Acad. Sci. USA115 2873 [35] Lu Q Y and Yildiz B 2015 Nano Lett.16 1186 [36] Lei H T, Zhang Q X, Wang Y B, Gao Y M, Wang Y Z, Liang Z Z, Zhang W and Cao R 2021 Dalton Trans.50 5120 [37] Jeen H, Choi W S, Freeland J W, Ohta H, Jung C U and Lee H N 2013 Adv. Mater.25 3651 [38] Li J, Guan M X, Nan P F, Wang J, Ge B H, Qiao K M, Zhang H R, Liang W H, Hao J Z, Zhou H B, Shen F R, Liang F X, Zhang C, Liu M, Meng S, Zhu T, Hu F X, Wu T, Guo J D, Sun J R and Shen B G 2020 Nano Energy78 105215 [39] Liu H F, Shi L, Guo Y Q, Zhou S M, Zhao J Y, Wang C L, He L F and Li Y 2014 J. Alloys Compd.594 158 [40] Miao X B, Wu L, Lin Y, Yuan X Y, Zhao J Y, Yan W S, Zhou S M and Shi L 2019 Chem. Commun.55 1442
Altmetric calculates a score based on the online attention an article receives. Each coloured thread in the circle represents a different type of online attention. The number in the centre is the Altmetric score. Social media and mainstream news media are the main sources that calculate the score. Reference managers such as Mendeley are also tracked but do not contribute to the score. Older articles often score higher because they have had more time to get noticed. To account for this, Altmetric has included the context data for other articles of a similar age.
