MAGNETIC RECORDING MEDIUM AND RECORDING AND REPRODUCING MECHANISM THEREOF

• Main Authors: KAWAKAMI SHINJI, FUJITA MASAO, HIROI TOSHIO, MAKITA YOSHIYUKI
• Format: Patent
• Language: English; Japanese
• Published: 23.08.2018
• Subjects: INFORMATION STORAGE; INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORDCARRIER AND TRANSDUCER; PHYSICS

PROBLEM TO BE SOLVED: To provide a magnetic recording medium having excellent electromagnetic conversion characteristics and running durability.SOLUTION: A magnetic recording medium according to the present invention includes a non-magnetic support medium and a magnetic layer containing magnetic particles, in which a length of magnetization in a width direction of the magnetic layer, which is a length of magnetization of a signal recorded in the magnetic layer, is 1 μm or less, the magnetic particles are composed of ε-iron oxide having an average particle size of 15 nm or less, a squareness ratio in a thickness direction of the magnetic layer is 0.65 or more, and, when L is the average thickness of a surface mixed layer formed on the surface of the magnetic layer opposite to the nonmagnetic support side, it becomes 4 nm≤L≤8 nm.SELECTED DRAWING: Figure 2 【課題】電磁変換特性及び走行耐久性に優れた磁気記録媒体を提供する。【解決手段】本発明に係る磁気記録媒体は、非磁性支持体と、磁性体粒子を含む磁性層とを備え、前記磁性層に記録された信号の磁化の長さであって前記磁性層の幅方向の前記磁化の長さが、１μｍ以下であり、前記磁性体粒子は、平均粒子径が１５ｎｍ以下のε−酸化鉄からなり、前記磁性層の厚さ方向の角形比が、０．６５以上であり、前記磁性層の前記非磁性支持体側とは反対側の表面に形成される表面混合層の平均厚さをＬとすると、４ｎｍ≦Ｌ≦８ｎｍである。【選択図】図２