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The La0.7Sr0.3 MnO3 perovskite is a ferromagnetic half-metal with a strong spin polarization and high Curie temperature Tc (355 K). 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 (> 10 3 %) and high field sensitivity (30%/Oe). These results are obtained in maguetic fields below 1 kOe and at room temperature.doi:10.12693/aphyspola.98.567 fatcat:m6yv5dbe3vcspofwi3id63xgei