| 摘要 |
PURPOSE:To improve the recording density to be twice while suppressing the deterioration in crosstalk by making the thickness of an interference layer provided to a slot and an inter-slot of a base different from each other and radiating a light beam with a different wavelength to the slot and the inter-slot part. CONSTITUTION:The interference layer 2 varying the effective value of the Kerr rotational angle of a magnetic recording layer is formed to have a different thickness from the slot 23 and the inter-slot 22 of the base 1. The Kerr rotary angle with respect to a 1st wavelength lambda1 of the slot 23 is larger than that of a 2nd wavelength lambda2 and the Kerr rotary angle of the 2nd wavelength lambda2 of the inter-slot 23 is selected larger than that of the 1st wavelength lambda1 and the light beam having the wavelengths lambda1, lambda2 is radiated respectively to the slot 23 and the inter-slot 22 respectively. As a result, since the signal from the adjacent slot 23 and inter-slot 22 is smaller corresponding to the effective Kerr rotary angle more than the signal from the slot 23 and the inter-slot 22, the deterioration in the crosstalk is suppressed and the recording density is doubled. |
