公开(公告)号：US20050227122A1

公开(公告)日：2005-10-13

申请号：US10511584

申请日：2003-03-20

Applicant: Migaku Takahashi ,  David Djayaprawira ,  Hirold Domon

Inventor： Migaku Takahashi ,  David Djayaprawira ,  Hirold Domon

IPC: C23C14/14 ,  G11B5/64 ,  G11B5/65 ,  G11B5/66 ,  G11B5/673 ,  G11B5/73 ,  G11B5/738 ,  G11B5/84 ,  H01F10/16

CPC classification number: G11B5/7325 ,  G11B5/66 ,  G11B5/7379

Abstract: A vertical magnetic recording medium exhibiting excellent noise characteristics in which magnetic interaction is reduced in a magnetic layer. The vertical magnetic recording medium (10) includes a nonmagnetic substrate (1), an underlying layer (2) formed directly or indirectly on the nonmagnetic substrate (1), and a magnetic layer (4) for recording magnetic information formed on the underlying layer (2), characterized in that the underlying layer (2) is composed of an alloy principally including two kinds of element, difference of standard free energy ΔG° for producing an oxide or a nitride of the both elements at room temperature is set not lower than 70 kJ/mol[O2 or N2], and crystal grains constituting the underlying layer (2) principally includes one of two elements having a higher ΔG°, and the grain boundary of the underlying layer (2) principally includes an oxide or a nitride of an element having a lower ΔG°.

Abstract translation: 具有优异的噪声特性的垂直磁记录介质，其磁性层中的磁相互作用减小。 垂直磁记录介质（10）包括非磁性衬底（1），直接或间接形成在非磁性衬底（1）上的下层（2）和用于记录形成在下层上的磁信息的磁性层（4） （2），其特征在于，下层（2）由主要包含两种元素的合金构成，室温下用于制造两种元素的氧化物或氮化物的标准自由能差ΔG°的差设定为不低 构成下层（2）的晶粒主要包括具有较高ΔG°的两个元素中的一个，并且下层（2）的晶界主要包括氧化物或 具有较低DeltaG°的元素的氮化物。