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A mechanism of current-induced magnetization reversal based on the parametricresonance is described. The source of the magnetization reversal is acurrent-induced magnetic field, which is applied perpendicularly to the easyaxis of magnetic anisotropy of a ferromagnetic nanomagnet. The current-inducedmagnetic field was measured in a FeCoB nanomagnet to be 60 Gauss at a currentdensity of 65 mA/um2. Two mechanisms of the magnetization reversal aredescribed and calculated. The first mechanism is the reversal by a RFelectrical current, which modulated at a frequency close to the precessionfrequency of the nanomagnet. The second mechanism is the reversal by a DCelectrical current, in which the magneto-resistance and the current dependencyof the induced magnetic field create a positive feedback loop, which amplifiesa random tiny thermal fluctuation into a large magnetization precession leadingto the magnetization reversal. The combination of the proposed mechanism withconventional magnetization-reversal mechanisms such as the Spin Torque and theSpin-Orbit Torque can improve the performance of a Magnetic Random AccessMemory.

Mechanism of parametric pumping of magnetization precession in a nanomagnet. Parametric mechanism of current-induced magnetization reversal