Models of microwave-assisted magnetic recording are used to investigate the potential of the technology. With both single-and double-layer [exchange coupled composite (ECC)] media, the higher effective head field gradient led to reduced transition jitter and higher SNR in written tracks. To reduce the high-frequency field to a realistic frequency range, the use of ECC media is required. However, the ECC medium design must consider interactions between the spin torque oscillator and the medium.Index Terms-Microwave-assisted magnetic recording (MAMR), simulation, spin torque oscillator (STO).
A model analysis was used to investigate a spin-transfer torque oscillator (STO) and magnetic write head for shingled microwave-assisted magnetic recording, where the interactions between STO and write head were included. The magnetic head had a tilted main pole (MP)-trailing shield (TS) gap with respect to the medium surface. The STO was placed in the tilted gap and off-center with respect to the MP center axis. The head structure allowed stable STO oscillation due to the lower in-plane field on the STO and large magnetic head field and high field gradient in the cross-track direction due to the wide pole. An off-centered STO in the MP-TS tilted gap had a stable oscillation at the cost of a slight reduction in oscillation amplitude.Index Terms-Micromagnetic simulation, microwave-assisted magnetic recording, shingled recording, tilted spin torque oscillator.
The spin-torque oscillator (STO) is the most important component in microwave-assisted magnetic recording. Some requirements for the STO are: large amplitude and stable oscillation, small injected current, and oscillation at a frequency that excites resonance in a recording medium. It is also necessary for the STO oscillation to closely follow the head coil current. In this paper, STOs were integrated into write heads and micromagnetic analyses carried out to obtain a write head structure with stable STO oscillation that could follow a high-frequency head coil current.
In this paper, we study the effect of the write head field on the signal-to-noise ratio and bit error rate of a magnetic recording channel, and optimize the write head for perpendicular magnetic recording (PMR). Six parameters of the write head for PMR are studied in the design. An optimal solution of the write head is obtained using the design of experiment methodology, the optimum writer field is verified, and the improved recording performances are achieved with the optimally designed write head.Index Terms-Bit error rate (BER), design of experiments (DOE), magnetic heads, micromagnetics, optimization, signal-to-noise ratio (SNR).
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