Abstract
The conducting interfaces between the insulators LaAlO${}_{3}$ and SrTiO${}_{3}$ generate a variety of phenomena that are entirely unexpected for insulators. These phenomena include two-dimensional superconductivity and ferromagnetism. A variety of models for mechanisms causing the ferromagnetism has been proposed. By applying a broad set of local and integral measurement techniques to series of samples fabricated to be virtually free of magnetic contaminations, authors' studies conclusively show that the LaAlO${}_{3}$-SrTiO${}_{3}$ interfaces do not intrinsically induce ferromagnetism. The magnetism is caused by defects such as oxygen vacancies generated at the interfaces.
Highlights
Understanding the fascinating properties of the conducting interface between the insulating and nonmagnetic oxides LaAlO3 and SrTiO3 [1] has been the topic of numerous investigations
Independent of temperature, microwave power, and detection angle, no ferromagnetic signals were observed by ferromagnetic resonance (FMR) for any sample
Previous research documented in the literature includes numerous experimental studies that clearly show the presence of ferromagnetism in n-type (001)-oriented LaAlO3/SrTiO3 samples
Summary
Understanding the fascinating properties of the conducting interface between the insulating and nonmagnetic oxides LaAlO3 and SrTiO3 [1] has been the topic of numerous investigations. An especially intriguing aspect is the reported ferromagnetism of the interface [10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25], which for some samples has been found to coexist with superconductivity [18,19,20]. Density function theory (DFT) calculations of the electronic properties of the ntype LaAlO3/SrTiO3 interface indicated moments induced by. Oscillations of wafer 6 acquired by recording the intensity of the red area of the diffraction pattern shown in the inset. (c) AFM micrograph of wafer 1 after deposition of the LaAlO3 layer.
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