MAGNETIC RECORDING MEDIUM AND MAGNETIC RECORDING AND REPRODUCING DEVICE

• Main Authors: OZAWA EIKI, KUROKAWA TAKUTO
• Format: Patent
• Language: English; Japanese
• Published: 10.10.2019
• Subjects: INFORMATION STORAGE; INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORDCARRIER AND TRANSDUCER; PHYSICS

To suppress degradation in electromagnetic conversion characteristics due to temperature changes from a high temperature to a low temperature under low humidity conditions in a magnetic recording medium having high surface smoothness of a magnetic layer.SOLUTION: A magnetic recording medium having a magnetic layer comprising a ferromagnetic powder and a binder on a nonmagnetic support is provided, in which a center line average surface roughness Ra measured regarding the surface of the magnetic layer is 1.0 nm or more and 1.6 nm or less, and a difference (S-S) between a spacing Smeasured by optical interferometry regarding the surface of the magnetic layer after ethanol cleaning and a spacing Smeasured by optical interferometry regarding the surface of the magnetic layer before ethanol cleaning is greater than 0 nm and 6.0 nm or less. A magnetic recording and reproducing device including the magnetic recording medium is also provided.SELECTED DRAWING: None 【課題】磁性層の表面平滑性が高い磁気記録媒体において低湿下での高温から低温への温度変化に起因する電磁変換特性の低下を抑制すること。【解決手段】非磁性支持体上に強磁性粉末および結合剤を含む磁性層を有する磁気記録媒体であって、上記磁性層の表面において測定される中心線平均表面粗さＲａは１．０ｎｍ以上１．６ｎｍ以下であり、かつ上記磁性層の表面においてエタノール洗浄後に光学干渉法により測定されるスペーシングＳａｆｔｅｒと上記磁性層の表面においてエタノール洗浄前に光学干渉法により測定されるスペーシングＳｂｅｆｏｒｅとの差分（Ｓａｆｔｅｒ−Ｓｂｅｆｏｒｅ）は０ｎｍ超６．０ｎｍ以下である磁気記録媒体。この磁気記録媒体を含む磁気記録再生装置。【選択図】なし