Magnetic Dead Layers in La0.7Sr0.3MnO3 Revisited

被引：16
|
作者：
Porter, S. B. [1 ,2 ]
Venkatesan, M. [1 ,2 ]
Dunne, P. [3 ]
Doudin, B. [3 ]
Rode, K. [1 ,2 ]
Coey, J. M. D. [1 ,2 ]
机构：
[1] Trinity Coll Dublin, CRANN, Dublin 2, Ireland
[2] Trinity Coll Dublin, Sch Phys, Dublin 2, Ireland
[3] IPCMS, F-67034 Strasbourg, France
来源：
IEEE TRANSACTIONS ON MAGNETICS | 2017年 / 53卷 / 11期
基金：
爱尔兰科学基金会;
关键词：
D-zero magnetism; ferromagnetic thin films; La0.7Sr0.3MnO3; magnetic dead layers; mixed-valence manganites; SrTiO3;
D O I：
10.1109/TMAG.2017.2731124
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
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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页数：4
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