Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8153801 | Journal of Magnetism and Magnetic Materials | 2018 | 5 Pages |
Abstract
This paper presents a steady auto-oscillation in a spin-torque oscillator using MgO-based magnetic tunnel junction (MTJ) with a perpendicular polarizer and a perpendicular free layer. As the injected d.c. current varied from 1.5 to 3.0â¯mA under a weak magnetic field of 290â¯Oe, the oscillation frequency decreased from 1.85 to 1.3â¯GHz, and the integrated power increased from 0.1 to 74â¯pW. A narrow linewidth down to 7â¯MHz corresponding to a high Q factor of 220 was achieved at 2.7â¯mA, which was ascribed to the spatial coherent procession of the free layer magnetization. Moreover, the oscillation frequency was quite sensitive to the applied field, about 3.07â¯MHz/Oe, indicating the potential applications as a weak magnetic field detector. These results suggested that the MgO-based MTJ with perpendicular magnetic easy axis could be helpful for developing spin-torque oscillators with narrow-linewidth and high sensitive.
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Condensed Matter Physics
Authors
Changxin Zhang, Bin Fang, Bochong Wang, Zhongming Zeng,