Abstract
We have investigated the impact of device size on the characteristics of spin-torque nano-oscillators by studying the frequency and linewidth of the oscillator as a function of current density utilizing micromagnetic simulations at room temperature. Upon reduction of the device size from 40 down to 10 nm, thermal noise flattens the frequency and linewidth trends with current density and lowers the threshold current density of the oscillation. The magnetization vector trajectories reveal that irregular oscillations exist in smaller devices. Our findings suggest that a 20 × 20 nm2 spin-torque oscillator could be a viable candidate for a magnetic read sensor.
Highlights
The areal density of commercial hard disk drives (HDD) is increasing rapidly, which requires the development of new HDD read sensor
The spintorque oscillator (STO)-based read head sensor senses the presence of an external magnetic field by detecting the variation of the precession frequency
Compared to the conventional magnetoresistive (MR) read head, which is functioning based on the giant magnetoresistive (GMR) effect or tunneling magnetoresistance (TMR) effect, the STO read head has two key benefits, including the signal-tonoise ratio (SNR)[1] and data-transfer rate.[3]
Summary
The areal density of commercial hard disk drives (HDD) is increasing rapidly, which requires the development of new HDD read sensor. The precession frequency is tunable by the external magnetic field or applied current. The STO-based read head sensor senses the presence of an external magnetic field by detecting the variation of the precession frequency.
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