MAGNETOTUNNELING EXPERIMENTS USING La0.7Sr0.3MnO3 BASED BREAK JUNCTIONS

J. Baszyński and T. Toliński Institute of Molecular Physics, Polish Academy of Sciences Smoluchowskiego 17, 60-179 Poznań, Poland

The La0.7Sr0.3MnO3 perovskite is a ferromagnetic half-metal with a strong spin polarization and high Curie temperature TC (355K). We have shown that a combination of the break junction technique with the special properties of the La0.7Sr0.3MnO3 perovskite can lead to extremely high values of tunneling magnetoresistance ratio (> 103%) and high field sensitivity (30%/Oe). These results are obtained in magnetic fields below 1kOe and at room temperature.

PACS numbers: 73.40.Gk, 75.30.Vn