MAGNETIC RECORDING MEDIUM HAVING NEW UNDERLAYER STRUCTURE

PROBLEM TO BE SOLVED: To provide a magnetic recording medium in which a particle size in a data recording layer is reduced resulting in noise reduction. SOLUTION: The magnetic recording medium comprises a substrate, first, second and third underlayers formed on the substrate, and a magnetic data recording layer formed on the underlayers. The underlayers typically have a bcc crystal structure and comprise Cr or Cr alloys. The magnetic data recording layer has a hcp crystal structure and comprises a Co alloy. The second underlayer typically comprises a material such as B, which tends to reduce the crystal sizes of the second underlayer and layers disposed thereon, and also to increase crystal spacing. COPYRIGHT: (C)2005,JPO&NCIPI