[14a-2J-1~12] 10.3 Giant magnetoresistance (GMR), tunnel magnetoresistance (TMR) and magnetic recording technologies

▲ [14a-2J-9] Evaluation of non-linear parameter on spin torque oscillator

〇Sumito Tsunegi¹, Hitoshi Kubota¹, Kay Yakushiji¹, Akio Fukushima¹, Shinji Yuasa¹ (1.AIST)

Keywords:spin torque oscillator,Noise,non-linearity

Spin torque oscillator (STO) is a device which transforms the spin dynamics to the radio frequency (rf) signal through magneto-resistance effect. This rf signal however has intense non-linearity which originates from the non-linearity of spin dynamics. The non-linearity results in broadening the linewidth due to the coupling between the phase noise and the amplitude noise.^1,2) In this work, we discuss the mechanism how to further reduce the linewidth by analyzing noise PSD spectrum on our vortex-STO having high emission power and narrow linewidth.³⁾
<Reference>
1)M. Quinsat, et al. Appl. Phys. Lett. 97, 182507 (2010)
2)E. Grimaldi, et al. Rhys. Rev. B 89, 054435 (2014)
3)S. Tsunegi, et al. APEX 7, 063009 (2014)