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- W1964330072 abstract "The magnetic properties of perpendicular magnetic recording media after ion irradiation modification were studied. CGC (Coupled Granular and Continuous) PMR media with a line-and-space pattern were dosed with Ar ions at a density of 1e+16 ions/cm2. A nano-imprint technique was used to fabricate precise minute nano-scale patterns. Examination of the Kerr loop of the line-and-space pattern after ion irradiation revealed that the coercivity and nucleation field were reduced, and the loop shape was similar to the sum of the loops between the magnetic film has ion irradiated and the resist stopped ions was observed by MOKE. As expected, the interactions were quite small between the ion-irradiated area, where magnetic modification was applied, and the non-ion-irradiated area. This indicates that the exchange coupling between the track, which preserves its magnetic properties, and the groove, which is magnetically modified, was significantly smaller than that expected in the continuous layer. To evaluate the read/write characterization, a spin-stand was used. There was no abnormal head flying. It was confirmed that there was no abnormal noise, such as Barkhausen noise, in the line-and-space pattern, except at the edge of the pattern. Analysis of the readback waveform signal in FFT showed that the patterned (ion-irradiated) area has several peaks that can be observed at lower frequency than the harmonics peaks, unlike the non-patterned (non-ion-irradiated) area." @default.
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- W1964330072 date "2009-01-01" @default.
- W1964330072 modified "2023-10-14" @default.
- W1964330072 title "Analysis of the Magnetic Properties of Discrete Track Media by the Ion Irradiation Method" @default.
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- W1964330072 doi "https://doi.org/10.3379/msjmag.0909ra0002" @default.
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