標題: Antiferromagnetic Interfacial Coupling and Giant Magnetic Hysteresis in La0.5Ca0.5MnO3-SrRuO3 Superlattices
作者: Kumar, Vandrangi Suresh
Zhou, Shu-Liang
Liu, Rui-Rui
Zhu, Yuan-Min
Liu, Heng-Jui
Chin, Yi-Ying
Lin, Hong-Ji
Chen, Chien-Te
Zhan, Qian
Chu, Ying-Hao
材料科學與工程學系
Department of Materials Science and Engineering
公開日期: 1-Oct-2018
摘要: Superlattices are of great importance due to their potential as new materials genome to synthesize new functional materials. Thus, tuning of the ground state of superlattices is crucial to further control their physical properties. In this study, superlattices (SLs) consisting of alternating layers of SrRuO3 (SRO) (5 nm) and La0.5Ca0.5MnO3 (LCMO) (5 nm) are epitaxially grown on SrTiO3 (STO) and LaAlO3 (LAO) substrates with 10-unit-cell periods. A variation in the substrate-induced-strain for this choice of SLs triggers observation of remarkable properties, such as magnetic anisotropy and large magnetic hysteresis. The strain states experienced by LCMO and SRO in these SLs result in strong ferromagnetic interlayer coupling and weak antiferromagnetic interlayer coupling at low temperatures in SLs of LCMO-SRO/STO and a strong antiferromagnetic interlayer coupling in SLs of LCMO-SRO/LAO. Besides, a large magnetic hysteresis resulting from the predominant magnetic anisotropy of SRO together with the strength of magnetic coupling is observed in SLs of LCMO-SRO/LAO along the out-of-plane direction of the LAO substrate. These four different magnetic behaviors along four different directions of substrate orientations are interpreted in terms of preferential orbital occupation and competing magnetic exchange coupling together with magnetic anisotropy. This study demonstrates the subtleties in controlling the strength of magnetic coupling at the interface and stands as a model system to realize fascinating magnetic phenomena in layer-by-layer hetero-epitaxial oxide films.
URI: http://dx.doi.org/10.1021/acsomega.8b01851
http://hdl.handle.net/11536/148396
ISSN: 2470-1343
DOI: 10.1021/acsomega.8b01851
期刊: ACS OMEGA
Volume: 3
起始頁: 14266
結束頁: 14273
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