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Multilayer devices based on CoFeB ferromagnetic layers separated by a thin nonmagnetic layer attract attention of specialists due to various possible fields of practical application. Metallic spintronics based on CoFeB multilayered structures rapidly gains new areas of its application in sensor industry, biomedicine, and information technologies. Magnetic structure of CoFeB single layers is studied in detail. Numerous reports on methods for inducing domain walls by electric current, manipulating them, and reversing polarity of perpendicularly polarized nanosized single- and multilayer magnets without external magnetic field by means of local electric fields and currents can be found for single CoFeB magnets. However, magnetization reversal of multilayer magnetic structures remains a challenge due to a complicated game of anisotropy of layers, DMI interaction, tensile strains and interlayer coupling. Nevertheless, understanding of physical processes contributing to GMR and conditions of switching between magnetic states are still far from complete understanding.
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