Patent ID: 9424873
Filing Date: 2016-08-23
CPC Classification: C23C,G11B,H01J

Claim Text:
1. A method of manufacturing a magnetic recording medium comprising: a magnetic recording layer forming step of forming a magnetic recording layer, including first and second magnetic recording layers, on a base, the first and second magnetic recording layers differing in composition and film thickness, a resist layer forming step of forming a resist layer on the magnetic recording layer, a patterning step of processing the resist layer so as to vary a thickness of the resist layer such that at least a first part has a first thickness and a second part has a second thickness different from the first thickness, thereby forming a predetermined pattern having a recessed part and a projected part, and an ion implanting step of irradiating said resist layer with ions and implanting said ions into the first and second magnetic recording layers, wherein at the ion implanting step, (1) each of the first and second magnetic recording layers to be implanted with ions is determined by selectively applying an energy amount to implant ions, and (2) a total amount of ions to be implanted into each of said layers is determined by selectively applying said energy amount for a respective time period for said each of said layers, wherein the ion implanting step implants the ions into the first and second magnetic recording layers of the magnetic recording layer such that the first and second magnetic recording layers each separately have a distinct maximum ion concentration distribution at certain depth within each said layer.