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(a) Schematic of nanobeak and (b) calculated intensity distribution of optical near field generated by the nanobeak placed near a film. The intensity represents the ratio between power density of the optical near-field and that of the incident light.
BPM used for the experiment: (a) medium structure and (b) atomic-force-microscope image of the medium before depositing carbon between dots.
(a) MFM images of medium after writing marks and (b) magnified view of the region surrounded by a dotted line in (a).
Characteristic of patterned medium: (a) Temperature dependence of saturation magnetization and anisotropic energy ; (b) dependence of coercivity on temperature and switching time. In (a), circular dots represent measured , the solid line represents a Brillouin function fitted to the measured values, and the dashed line represents calculated from . In (b), circular dots represent measured coercivity and solid lines represent coercivity calculated from Sharlock’s formula. The square dot represents the writing condition used in the experiment.
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