Burlakov V. Electrophysical properties of thin-film structures ferromagnet–dielectric–ferromagnet for migration of electrically conductive impurities.

As part of the work, a negative differential resistance was obtained for the first time in the study of the electrical properties of the Fe / MgO / (Fe + C), Fe / MgO / Ni and Fe / MgO / Co systems. This result can be achieved by ensuring the inhomogenei-ty of the dielectric thickness in the manufacturing of samples and the choice of differ-ent types of metals as the upper and lower layers of the studied heterostructure. It has been experimentally established that the current flowing through the obtained contact of the Fe / MgO / (Fe + C) system stimulates the processes of carbon electromigration in iron. The effective diffusion coefficient of carbon in iron during electric current flow is calculated. It is three orders of magnitude higher than the thermally activated diffu-sion coefficient. It is established that the faster the current increases, the lower the voltage at which there is a region of negative differential resistance. Prolonged expo-sure of the sample of the Fe / MgO / Fe system to the atmosphere at room tempera-ture leads to the rectifying properties characteristic. From experiments on p- and n-type conductivity substrates in the work function of the electrons in the iron during carbon doping was calculated.