2021/04/27 by Vadym Zayets, Zayets, Vadym
Materials Science · Physics and Astronomy · #FOS: Physical sciences #Magnetic Properties and Applications #Magnetic Properties of Alloys #Magnetic properties of thin films #Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
paper · pdf · doi:10.48550/arxiv.2104.13008
openalex publication_date 2021/04/27 · openalex created_date 2021/05/10 · openalex updated_date 2026/07/28
A mechanism of current-induced magnetization reversal based on the parametric resonance is described. The source of the magnetization reversal is a current-induced magnetic field, which is applied perpendicularly to the easy axis of magnetic anisotropy of a ferromagnetic nanomagnet. The current-induced magnetic field was measured in a FeCoB nanomagnet to be 60 Gauss at a current density of 65 mA/um2. Two mechanisms of the magnetization reversal are described and calculated. The first mechanism is the reversal by a RF electrical current, which modulated at a frequency close to the precession frequency of the nanomagnet. The second mechanism is the reversal by a DC electrical current, in which the magneto-resistance and the current dependency of the induced magnetic field create a positive feedback loop, which amplifies a random tiny thermal fluctuation into a large magnetization precession leading to the magnetization reversal. The combination of the proposed mechanism with conventional magnetization-reversal mechanisms such as the Spin Torque and the Spin-Orbit Torque can improve the performance of a Magnetic Random Access Memory.