| Autor: |
Al-Mahdawi, Muftah, Toda, Yusuke, Shiokawa, Yohei, Sahashi, Masashi |
| Rok vydání: |
2015 |
| Předmět: |
|
| Zdroj: |
Physical Review B 93, 024408 (2016) |
| Druh dokumentu: |
Working Paper |
| DOI: |
10.1103/PhysRevB.93.024408 |
| Popis: |
Spin-torque oscillators are strong candidates as nano-scale microwave generators and detectors. However, because of large amplitude-phase coupling (non-linearity), phase noise is enhanced over other linear auto-oscillators. One way to reduce nonlinearity is to use ferromagnetic layers as a resonator and excite them at localized spots, making a resonator-excitor pair. We investigated the excitation of oscillations in dipole-coupled ferromagnetic layers, driven by localized current at ferromagnetic nano-contacts. Oscillations possessed properties of optical-mode spin-waves and at low field ($\approx$200 Oe) had high frequency (15 GHz), a moderate precession amplitude (2--3$^\circ$), and a narrow spectral linewidth ($<$3 MHz) due to localized excitation at nano-contacts. Micromagnetic simulation showed emission of resonator's characteristic optical-mode spin-waves from disturbances generated by domain-wall oscillations at nano-contacts. |
| Databáze: |
arXiv |
| Externí odkaz: |
|
