期刊
IEEE TRANSACTIONS ON MAGNETICS
卷 53, 期 11, 页码 -出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TMAG.2017.2731124
关键词
D-zero magnetism; ferromagnetic thin films; La0.7Sr0.3MnO3; magnetic dead layers; mixed-valence manganites; SrTiO3
资金
- FP7 IFOX Project
- Science Foundation Ireland AMBER Center [12/RC/2278]
The magnetic dead layers in films a few nanometers thick are investigated for La0.7Sr0.3MnO3 on SrTiO3(STO), LaAlO3(LAO), and (LaAlO3)(0.3)(Sr2TaAlO6)(0.7) ( LSAT) substrates. An anomalous moment found to persist above the Curie temperature of the La0.7Sr0.3MnO3 films is not attributed to the films, but to oxygen vacancies at or near the surface of the substrate. The contribution to the moment from the substrate is as high as 20 mu B/nm(2) in the case of STO or LSAT. The effect is increased by adding an STO cap layer. Taking this d-zero magnetism into account, extrapolated magnetic dead-layer thicknesses of 0.8, 1.5, and 3 nm are found for the manganite films grown on LSAT, STO, and LAO substrates, respectively. An STO cap layer eliminates the LSMO dead layer.
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