锰铁矿
超晶格
材料科学
钙钛矿(结构)
凝聚态物理
拉伤
薄膜
纳米技术
铁磁性
光电子学
物理
结晶学
化学
医学
内科学
作者
Jianyong Su,Cai Chengwei,Mei Ji
出处
期刊:International Journal of Modern Physics B
[World Scientific]
日期:2023-03-04
卷期号:38 (03)
标识
DOI:10.1142/s021797922450036x
摘要
The mixed-valence perovskite manganites attracted much attention because of their interesting electro-magnetic properties, and strain modulation on magnetic properties of perovskite manganites is worth exploring. In this paper, [La[Formula: see text]Ca[Formula: see text]MnO 3 /La[Formula: see text]Ca[Formula: see text]MnO 3 ][Formula: see text] superlattice films with different La[Formula: see text]Ca[Formula: see text]MnO 3 layer thicknesses are prepared by pulsed laser deposition (PLD). The crystal structures (lattice constants) of samples are measured by X-ray diffraction (XRD). The strain of the films is determined according to their crystal structures. The magnetic hysteresis loops (M-H loops) and magnetization versus temperature (M-T) curves of these superlattice films are measured by the physical property measurement system (PPMS). From the M-H loops, the coercive field (H[Formula: see text] of the samples can be measured. From the M-T curves, the Curie temperature (T[Formula: see text] of the samples can be obtained. All samples show a ferromagnetic to paramagnetic transition at T C , and the [La[Formula: see text]Ca[Formula: see text]MnO 3 /La[Formula: see text]Ca[Formula: see text]MnO 3 ][Formula: see text] sample with the La[Formula: see text]Ca[Formula: see text]MnO 3 layer thicknesses of 72[Formula: see text]Å has an antiferromagnetic Néel transition at T N . According to the strain state and magnetic phases, the magnetic properties are comprehensively analyzed. It is found that with the increase of ferromagnetic La[Formula: see text]Ca[Formula: see text]MnO 3 layer thickness, the ferromagnetic phase is increased, and the double exchange effect can also be enhanced, resulting in the increase of T C . When the thickness of La[Formula: see text]Ca[Formula: see text]MnO 3 reaches 96[Formula: see text]Å, the uneven strain distribution in the superlattice can induce the reduction of ferromagnetic phase compared with antiferromagnetic phase (even antiferromagnetic phase starts to appear), and the double exchange effect can be weakened, and finally leading to the decrease of T C . In addition, with increasing the La[Formula: see text]Ca[Formula: see text]MnO 3 layer thickness, H C gradually decreases. The change of H C is related to strain states and magnetic phase interactions in the samples. The analysis of the strain and magnetism can contribute to the understanding of perovskite manganite superlattice films.
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