Abstract
Oscillation behavior of a spin torque oscillator (STO) less than 40 nm in size was investigated by using micromagnetic simulations for microwave-assisted magnetic recording (MAMR) over 5 Tb/in2. Decreasing the STO size from 40 to 20 nm deteriorates the stability of a reference layer (REF) and it shrinks the stable oscillation region of a field generation layer (FGL). Enhancing the magnetic anisotropy energy of the REF Ku_REF stabilizes the magnetization motion of the REF against the spin transfer torque (STT) effect and the external magnetic field Hz, and the stable oscillation region of the FGL expands within a relative lower applied voltage Vsto region, but random oscillation with fluctuating elevation angles appears at a higher Hz and Vsto. Similar phenomenon is observed when increasing the thickness of the REF tREF. Enhancing both Ku_REF × tREF and the thickness of FGL are found to stabilize oscillation of the FGL against the STT effect from a stable REF at a larger strength of Hz and a higher Vsto without the appearance of random oscillation, making it possible to apply about 20-nm-square STO to a magnetic head for over 5 Tb/in2.
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