Exchange Bias Effect and Orbital Reconstruction in (001)-Oriented LaMnO3/LaNiO3 Superlattices
| Autor: | Shifei Qi, Zhiyong Quan, Julu Zang, Zhi Yan, Guowei Zhou, Yuhao Bai, Xiaohong Xu |
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| Rok vydání: | 2017 |
| Předmět: |
Materials science
Magnetic moment Condensed matter physics Superlattice Heterojunction 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Ion Paramagnetism Exchange bias Nuclear magnetic resonance Orbital reconstruction 0103 physical sciences General Materials Science 010306 general physics 0210 nano-technology |
| Zdroj: | ACS Applied Materials & Interfaces. 9:39855-39862 |
| ISSN: | 1944-8252 1944-8244 |
| DOI: | 10.1021/acsami.7b14503 |
| Popis: | Paramagnetic LaNiO3 (LNO)-based heterostructures have been attracting the attention of researches, especially since the interesting exchange bias (EB) effect has been observed in (111)-oriented LaMnO3 (LMO)/LNO superlattices (SLs). However, this effect is not expected to occur in the (001) direction SLs. In this paper, we report the observation of an unexpected EB effect in (001)-oriented (LMO)3/(LNO)t SLs. The orbits of interfacial Mn/Ni ions preferentially occupy the strain-stabilized x2 – y2 in ultrathin LNO layers [t ≤ 4 unit cells (u.c.)]. Conversely, as the LNO layer becomes thicker (t ≥ 6 u.c.), the EB effect is absent, and the orbits are reconstructed to form the 3z2 – r2 preferential occupancy. The absence of the EB in thicker LNO-based SLs is attributed to the interfacial charge transfer suppressed by orbital reconstruction as a consequence of the increasing LNO thickness. In the thinner LNO-based SLs, the larger charge transfer results in stronger localized magnetic moments for the cause of the... |
| Databáze: | OpenAIRE |
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