Ferromagnetism enhanced by structural relaxation of biaxially compressed LaCoO3 films
Ferromagnetism enhanced by structural relaxation of biaxially compressed LaCoO3 films
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DOI：
10.1063/1.3545809
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发表时间：
2011-04-01
影响因子：
3.2
通讯作者：
Suzuki, Yuri
中科院分区：
文献类型：
--
作者：
Mehta, Virat;Suzuki, Yuri
在LaAlO3衬底上合成了LaCoO3外延薄膜，探讨了外延应变和结构对双轴压缩薄膜铁磁性的影响。相干应变和四方结构只有在使用更高能量密度生长的薄膜样品中才能实现。应变随厚度的增加而松弛，并伴随着马赛克扩展的增加。在使用较低激光能量密度生长的完全松弛薄膜中，始终可以看到较高的磁化值。这些结果表明，外延应变不是决定铁磁性的唯一因素，微观结构和缺陷可能起重要作用。(C) 2011年美国物理研究所。(doi: 10.1063/1.3545809)
Epitaxial LaCoO3 films were synthesized on LaAlO3 substrates to explore the role of epitaxial strain and structure on the ferromagnetism observed in these biaxially compressed films. Coherent strain and tetragonal structure were only achieved in thin film samples grown using higher energy densities. The strain relaxed with increasing thickness and was accompanied by increasing mosaic spread. Higher magnetization values were consistently seen in fully relaxed films grown using lower laser energy density. These results suggest that epitaxial strain is not the only factor determining the ferromagnetism and that the microstructure and defects may play a significant role. (C) 2011 American Institute of Physics. [doi:10.1063/1.3545809]