Spin-torque oscillator (sto) for microwave-assisted magnetic recording (mamr) and methods of use thereof

Abstract

In one embodiment, a magnetic data storage system includes a main pole power supply adapted for supplying an excitation current to a main pole coil, a microwave-assisted magnetic recording (MAMR) device including a spin-torque oscillator (STO) element, the STO element having a field generation layer (FGL) and a polarization layer, a timing-control circuit adapted for determining a duration of a main pole magnetic moment inversion process and signaling a start of the main pole magnetic moment inversion process, and a current-regulating circuit comprising an STO power supply adapted for supplying current to the STO element, wherein the STO power supply prevents degradation of a single rotating magnetic domain structure in the FGL into a closure magnetic domain structure in the FGL. Other systems and methods for preventing degradation of the single rotating magnetic domain structure in the FGL into a closure magnetic domain structure are described for more embodiments.