| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1818352 | Physica C: Superconductivity and its Applications | 2011 | 5 Pages |
The effect of DC current injection on the AC current carrying characteristics of superconducting thin film rings was analyzed because of the possibility for using similar ferromagnetic/high temperature superconducting (FM/HTS) structures for contactless investigation of the spin-injection process. It was shown, that the injection leads to decreasing of the critical current IC1, determined by using AC magnetic field. A superposition of AC and DC currents in the HTS ring and a breaking of Cooper pairs may cause this effect. The effect was investigated experimentally at 77 K in HTS Y1Ba2Cu3O7−x (YBCO) thin film samples with YBCO or La0.7Sr0.3MnO3 (LSMO) current injecting electrodes: IC1 of the last sample was found to be more sensitive to the injection process. The results allow concluding, that a change of the IC1 caused by both mechanisms can be evaluated separately and the contactless method can be successfully used for the investigation of the spin-injection effect.
► DC current based spin-injection can be contactless studied in FM/HTS samples using AC field. ► Contactless measured IC depends on currents superposition and pairs breaking effects. ► Contribution of both mechanisms to IC may be evaluated separately. ► Experiments in HTS YBCO films (77 K) with YBCO or LSMO current injecting electrodes confirm the results.
