| Abstract [eng] |
The magnetoresistive properties of lanthanum manganites are attracting considerable interest of research and applications. It was demonstrated that manganite La1-xSrxMnO3 (LSMO) films exhibiting colossal magnetoresistance (CMR) effect can be successfully used for the development of CMR-B-scalar sensors operating at room temperatures and measuring the absolute magnitude of magnetic flux density in very small volumes. This comprehensive study is focused on the investigation of magnetoresistive properties of the LSMO films to use them for pulsed magnetic field measurements at room and higher temperatures. The study starts with the investigation of LSMO films grown on glass ceramics by pulsed injection MOCVD method, and demonstrates possibility to tune their magnetoresistive properties in a wide range of temperatures and magnetic fields by changing film thickness and deposition temperature. Further, it is shown that Mn excess in LSMO films could significantly increase their metal-insulator transition temperature and thus increase the magnetoresistance values at higher than room temperatures. Then, the analysis on the dependence of the magnetoresistive properties of the LSMO films grown on different substrates –AT-cut quartz, Al2O3 and Si/SiO2-1000 is provided. Finally, the successful application of CMR-B-scalar sensors produced from LSMO film with Mn excess on Al2O3 substrate for the investigation of magnetic field dynamics during Magnetic Pulse Welding of metals is presented. |
