Thermal Stability Study of Tilted-Polarizer Spin Torque Nano-oscillator
| Autor: | C. W. Feng, P. Wei, L. Ni, L. Cai, X. K. Yang, H. Q. Cui |
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| Rok vydání: | 2016 |
| Předmět: |
010302 applied physics
Physics Condensed matter physics business.industry Film plane 02 engineering and technology Lyapunov exponent 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Electronic Optical and Magnetic Materials Magnetic field symbols.namesake Magnetization Nonlinear system Optics 0103 physical sciences symbols Torque 0210 nano-technology business Current density Spin-½ |
| Zdroj: | Journal of Superconductivity and Novel Magnetism. 29:2873-2879 |
| ISSN: | 1557-1947 1557-1939 |
| DOI: | 10.1007/s10948-016-3624-x |
| Popis: | The spin torque nano-oscillator (STNO) with out of film plane fixed layer magnetization, namely the tilted-polarizer spin torque nano-oscillator (TP-STNO), has the advantage of microwave generation without the help of a magnetic field, which makes it promising to be integrated into a chip. In this paper, we present a thermal stability study of TP-STNO by macrospin modeling, in which the thermal noise is induced into the H eff of the Landau-Liftshitz-Gilbert-Slonczewski equation in the form of a stochastic magnetic field. The TP-STNO with different tilted angles is studied by numerical simulations based on the macrospin model and nonlinear system theory. Depending on the analysis of Lyapunov exponents as a function of drive current density in the room temperature range, we obtain the drive current density ranges in which TP-STNO can oscillate stably in the presence of thermal noise. These quantified results are essential during the practical usage of TP-STNO. |
| Databáze: | OpenAIRE |
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