Change of Magnetic Characteristics of Magnetic Nanofilms and Control of a Spin Current by means of a Laser Radiation

Abstract

For the high-frequency components of spintronics, the high-speed systems to control magnetization of materials in the local microregions are required. Solving this problem, using conventional magnetic systems, is extremely difficult. Short laser pulses are promising to control the spin current in multilayer magnetic films. Laser radiation makes possible to excite the current along the laser beam and obtain a strong magnetic field due to the inverse Faraday effect. A given article describes some features of electron–photon drag effect and concerns the mechanisms of remagnetization of magnetic nanofilms under the laser irradiation. The results of studies of the effect of nanosecond and picosecond laser pulses on the magnetic properties of NiFe films as well as conductivity of the Tb19Co5Fe76/Pr6O11/Tb22Co5Fe73 and Co80Fe20/Pr6O11/Co30Fe70 tunnel junctions are presented. As shown, using the ultra-short laser pulses, one can change the structure and magnetic properties of thin films, study dynamics of their remagnetization, and control spin current in the high-speed devices of spintronics.

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