Journal
PHYSICAL REVIEW B
Volume 100, Issue 9, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.100.094432
Keywords
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Funding
- National Basic Research of China [2016YFA0300701, 2017YFA0206300, 2018YFA0305704, 2017YFA0303601]
- National Natural Science Foundation of China [11520101002, 51590880, 11674378]
- Key Program of the Chinese Academy of Sciences
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Perpendicular magnetic anisotropy (PMA) of magnetic materials has received much attention because of its potential application to spintronics devices. In general, the tensely strained (001)-La2/3Sr1/3MnO3 (LSMO) layer is easy plane. Here we demonstrate that the tensile LSMO layer will exhibit an out-of-plane magnetic anisotropy if it is sandwiched between two La1-xSrxCoO2.5+delta (LSCO) layers. The most remarkable observation is that the PMA enhances with the increase of the Sr content in LSCO. It is similar to 2.7 x 10(6) erg/cm(3) for x = 0.05 and similar to 4.3 x 10(6) erg/cm(3) for x = 0.5. This value is two orders of magnitude greater than that obtained by compressively straining the LSMO film (similar to 10(4) erg/cm(3)). Analysis of high resolution lattice image shows the formation of perovskite/brownmillerite-type interfaces in the multilayers: Brownmillerite-like lattice structure forms in the interfacial layers of LSCO, resulting in a coherent tilting of adjacent MnO6 octahedra. This in turn leads to, as evidenced by the analysis of x-ray linear dichroism, selective orbital occupation thus spin reorientation. There is evidence that the brownmillerite-structured LSCO is more easily formed when x is high, which explains the growth of anisotropy constant with the increase of Sr content.
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