Here, we present a protocol to grow LSMO nanoparticles and (Gd) BCO films on (001) SrTiO3 (STO) single-crystal substrates by radio frequency (RF)-sputtering.
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Method Article
Radio Frequency Magnetron Sputtering of GdBa2Cu3O7−δ/ La0.67Sr0.33MnO3 Quasi-bilayer Films on SrTiO3 (STO) Single-crystal Substrates
In This Article
Summary
Abstract
Here, we demonstrate a method of coating ferromagnetic La0.67Sr0.33MnO3 (LSMO) nanoparticles on (001) SrTiO3 (STO) single-crystal substrates by radio frequency (RF) magnetron sputtering. LSMO nanoparticles were deposited with diameters from 10 to 20 nm and heights between 20 and 50 nm. At the same time, (Gd) Ba2Cu3O7−δ ((Gd) BCO) films were fabricated on both undecorated and LSMO nanoparticle decorated STO substrates using RF magnetron sputtering. This report also describes the properties of GdBa2Cu3O7−δ/ La0.67Sr0.33MnO3 quasi-bilayer films structures (e.g., crystalline phase, morphology, chemical composition); magnetization, magneto-transport, and superconducting transport properties were also evaluated.
Introduction
The hole-doped manganite La0.67Sr0.33MnO3 (LSMO) have unique properties such as wide-band gaps, half-metallic ferromagnetism, and entangled electronic states, which provide extraordinary opportunities for potential spintronic applications1,2,3,4. Currently, many researchers are endeavoring to take advantage of the unique properties of LSMO to inhabit the vortex movement for high temperature superconducting (HTS) films, such as (RE) Ba2Cu3O7−δ f....
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Protocol
1. Substrate and Target Preparation
NOTE: This section describes the preparation of the sputter deposition chamber and the single crystal SrTiO3 (STO) substrates.
- Use 10 mm x 10 mm SrTiO3 (STO) single-crystal substrates during the RF magnetron sputtering process.
- Sequentially clean the substrates in isopropanol and deionized water for 10 min each at room temperature in ultrasonic bath. Then dry the substrates with nitrogen, which is for uniform covering of the substrate and good film adherence.
- Mount the (001) STO substrates in the substrate holders with silver powder conductive glue. Lo....
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Results
The thickness of (Gd) BCO films on both bare and LSMO decorated STO substrate was 500nm, which was measured by a surface profilometer. The film thickness was controlled by sputtering time. Figure 1a,b shows the AFM image of LSMO nanoparticle (sputtering time of 10 s) on 1.0 cm x 1.0 cm single-crystal STO substrates to prove that the LSMO nanoparticles grown on STO substrates uniformly. The surface and to measure the roughness of the films was.......
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Discussion
Here we have demonstrated that this method can be used to prepare LSMO ferromagnetic nanoparticles of uniform distribution on SrTiO3 (STO) single-crystal substrates. The (Gd) BCO films also can be deposited on both bare and LSMO decorated STO substrate. With an appropriate adjustment of deposited parameters, such as growth temperatures and target-substrate distance, this method ought to be useful for deposited different kinds of magnetic and non-magnetic particles or layers, for example, CeO2, YSZ (.......
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Disclosures
The authors have nothing to disclose.
Acknowledgements
This work was supported by the National Natural Science Foundation of China (No. 51502168; No.11504227) and the Shanghai Municipal Natural Science Foundation (No.16ZR1413600).The authors gratefully thank the Instrumental Analysis Center of Shanghai Jiao Tong University and Ma-tek analytical lab for competent technical assistance.
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Materials
| Name | Company | Catalog Number | Comments |
|---|---|---|---|
| Sputter Deposition System | Shenyang scientific instruments Limited by Share Ltd | Bespoke | |
| SrTiO3 Single Crystal Substrate | Hefei Ke crystal material technology Co., Ltd | Single-sided epi-polished | (001) orientation |
| La0.67Sr0.33MnO3 sputtering target | Hefei Ke crystal material technology Co., Ltd | Bespoke | 60 mm diameter |
| GdBa2Cu3O7−δ sputtering target | Hefei Ke crystal material technology Co., Ltd | Bespoke | 60 mm diameter |
| Atomic Force Microscope | Brüker | Dimension Icon | |
| X-ray Diffractometer | Brüker | D8 Discover | |
| Physical Property Measurement System | Quantum Design | PPMS 9 |
References
- Gong, J., Zheng, D., Li, D., Jin, C., Bai, H. Lattice distortion modified anisotropic magnetoresistance in epitaxial La0.67Sr0.33MnO3 thin films. Journal of Alloys and Compounds. 735, 1152-1157 (2018).
- Wang, J., Han, Z., Bai, J., Luo, B., Chen, C.
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