Abstract: Recently, the nanotechnologies are largely implemented in space technologies. The concept of magnetometer with magnetic resonance/MMR/ is considered in this paper. The device combines the advantages of the electronic devices with thin organic film and the traditional MMR. Especially, investigations are carried out on the splitting in polaron pairs in organic diodes, based on π- conjugated organic semiconductor MEH-PPV. As this spin-dependent transition of electrons controls the conductivity of the material, magnetic resonance with electrons or holes could be detected through measurement of the electric current. In fact, the diode consists of thin layer of MEH-PPV, located between two levels, injecting electrons and holes. This structure is identical with these used in the conventional organic light-emitting diodes. The properties of this organic MMR, regarding its flexibility, sensibility and limits of the magnetic field, and its response to temperature fluctuations and aging are investigated. Experiments are carried out at room temperature. Ninth Scientific Conference, SES, with international Participation, 20-22 nov. 2013, Sofia, рр. 497-505, ISSN 2603-3313 (print), ISSN 1313-3888