Login| Sign Up| Help| Contact|

Patent Searching and Data


Title:
MAGNETIC RECORDING MEDIUM
Document Type and Number:
Japanese Patent JP2013164891
Kind Code:
A
Abstract:

To provide a magnetic recording medium that has superior electromagnetic conversion characteristics and travel characteristics.

An inventive magnetic recording medium includes: a non-magnetic substrate; a non-magnetic layer formed on one principal surface of the non-magnetic substrate; and a magnetic layer formed on a principal surface on the side opposite to the non-magnetic substrate side, of the non-magnetic layer. Assuming that a Young's modulus of the non-magnetic substrate in the longitudinal direction thereof is not less than 5.0 GPa, a thickness of the non-magnetic substrate is not less than 3.9 μm, the residual magnetic flux density of the magnetic layer is Mr, and the average thickness of the magnetic layer is t, a formula, 0.0020 μT*m≤Mr*t≤0.0150 μT*m, is satisfied. Assuming that the average thickness of a first mixed layer formed on a surface on the side opposite to the non-magnetic layer side, of the magnetic layer is L1, a formula, 2 nm≤L1≤6 nm, is satisfied. Assuming that the ratio of a magnetic layer component contained in a second mixed layer formed on a surface on the non-magnetic layer side, of the magnetic layer is a magnetic layer component mixture ratio R, a formula, 0.07≤R≤0.30, is satisfied.


Inventors:
KAWAKAMI SHINJI
TANAKA KENJI
Application Number:
JP2012028369A
Publication Date:
August 22, 2013
Filing Date:
February 13, 2012
Export Citation:
Click for automatic bibliography generation   Help
Assignee:
HITACHI MAXELL
International Classes:
G11B5/716; G11B5/706; G11B5/714; G11B5/73; G11B5/738
Domestic Patent References:
JP2008128672A2008-06-05
JP2010218653A2010-09-30
JP2011146093A2011-07-28
JP2008128672A2008-06-05
Foreign References:
US20070227624A12007-10-04
US20110242698A12011-10-06
US20070227624A12007-10-04
Attorney, Agent or Firm:
Ikeuchi, Sato & Partners