Current Modulation of Nanoconstriction Spin-Hall Nano-Oscillators

• A single nanoconstriction spin-Hall nano-oscillator (NC-SHNO) in out-of-plane fields is presented as a nonlinear amplitude and frequency modulator operated by radio-frequency (RF) current modulation. The current modulation was carried out in different NC-SHNO nonlinearity regimes corresponding to negative, zero, and positive values of df/dI in order to investigate the device response to an 80 MHz modulating current. Our study shows that current modulation of SHNOs can be quantitatively predicted by a nonlinear frequency and amplitude modulation (NFAM) model using the values of df/dI and d2f/dI2 extracted from the free-running frequency f versus current I profile. The NFAM model reproduces the asymmetric sideband amplitude as well as the red and blue shift of the frequency in excellent agreement with the experimental results. The ability to predict the modulation process is a necessary benchmark in designing SHNO modulators for future integrated microwave circuits.

Subject headings

TEKNIK OCH TEKNOLOGIER  -- Elektroteknik och elektronik (hsv//swe)

ENGINEERING AND TECHNOLOGY  -- Electrical Engineering, Electronic Engineering, Information Engineering (hsv//eng)

NATURVETENSKAP  -- Fysik (hsv//swe)

NATURAL SCIENCES  -- Physical Sciences (hsv//eng)

Keyword

amplitude modulation

nonlinear frequency

Spin electronics

spin-Hall nano-oscillator

spintronics

Magnetoelectronics

Microwave circuits

Modulators

Current modulation

Free running frequency

Frequency modulators

Nano-oscillator

Radio frequency (rf) currents

Red and blue shifts

Spin electronic

Modulation

amplitude modulation

nonlinear frequency

Spin electronics

spin-Hall nano-oscillator

spintronics

Publication and Content Type

ref (subject category)

art (subject category)