Control of magnetic anisotropy by orbital hybridization with charge transfer in (La0.67Sr0.33MnO3)n/(SrTiO3)n superlattice

被引:15
作者
Zhang, Bangmin [1 ]
Wu, Lijun [2 ]
Zheng, Jincheng [2 ,3 ,4 ,5 ]
Yang, Ping [6 ]
Yu, Xiaojiang [6 ]
Ding, Jun [1 ]
Heald, Steve M. [7 ]
Rosenberg, Richard A. [7 ]
Venkatesan, Thirumalai Venky [1 ,8 ,9 ,10 ,11 ]
Chen, Jingsheng [1 ]
Sun, Cheng-Jun [7 ]
Zhu, Yimei [2 ]
Chow, Gan Moog [1 ]
机构
[1] Natl Univ Singapore, Dept Mat Sci & Engn, 9 Engn Dr 1, Singapore 117576, Singapore
[2] Brookhaven Natl Lab, Condensed Matter Phys & Mat Sci Div, Upton, NY 11973 USA
[3] Xiamen Univ, Dept Phys, Xiamen 361005, Peoples R China
[4] Xiamen Univ, Collaborat Innovat Ctr Optoelect Semicond & Effic, Xiamen 361005, Peoples R China
[5] Xiamen Univ Malaysia, Sepang 439000, Selangor, Malaysia
[6] Natl Univ Singapore, SSLS, 5 Res Link, Singapore 117603, Singapore
[7] Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA
[8] Natl Univ Singapore, NUSNNI Nanocore, 2 Engn Dr 3, Singapore 117581, Singapore
[9] Natl Univ Singapore, Dept Phys, 2 Sci Dr 3, Singapore 117551, Singapore
[10] Natl Univ Singapore, Dept Elect & Comp Engn, 4 Engn Dr 3, Singapore 117583, Singapore
[11] Natl Univ Singapore, NUS Grad Sch Integrat Sci & Engn, 28 Med Dr, Singapore 117456, Singapore
基金
新加坡国家研究基金会;
关键词
ELECTRON-GAS; PHASE; INTERFACE; SPECTRA;
D O I
10.1038/s41427-018-0084-8
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The chemical asymmetry at the hetero-structure interface offers an effective opportunity to design desirable electronic structures by controlling charge transfer and orbital hybridization across the interface. However, controlling the hetero-interface remains a daunting task. Here, we report the modulation of interfacial coupling of (La0.67Sr0.33MnO3)(n)/(SrTiO3)(n) superlattices by manipulating the periodic thickness with n unit cells of SrTiO3 and n unit cells of La0.67Sr0.33MnO3 with a fixed thickness of similar to 120 unit cells. The easy axis of magnetic anisotropy rotates similar to 45 degrees towards the out-of-plane direction from n = 10 to n = 2 at reduced temperature T-Re = T/TS = 0.87, where T-S is the temperature at the onset of magnetization. Transmission electron microscopy reveals an enlarged tetragonal ratio > 1 with breaking of volume conservation around the (La0.67Sr0.33MnO3)(n)/(SrTiO3) n interface and electronic charge transfer from Mn to Ti 3d orbitals across the interface. Orbital hybridization accompanying the charge transfer results in preferred occupancy of 3d(3z2-r2) orbitals at the interface and induces a stronger electronic hopping integral and interfacial magnetic anisotropy along the out-of-plane direction, which contributes to the rotation towards the out-of-plane direction of an effective magnetic easy axis for n = 2. We demonstrate that interfacial orbital hybridization with charge transfer in the superlattice of strongly correlated oxides may be a promising approach to tailor electronic and magnetic properties in device applications.
引用
收藏
页码:931 / 942
页数:12
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