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    • 121. 发明申请
    • THERMALLY ASSISTED MAGNETIC RECORDING DEVICE
    • 热辅助磁记录装置
    • US20110299367A1
    • 2011-12-08
    • US13153073
    • 2011-06-03
    • IRIZO NANIWATakuya MatsumotoYukio Kato
    • IRIZO NANIWATakuya MatsumotoYukio Kato
    • G11B11/00
    • G11B5/3106G11B5/3136G11B5/40G11B5/607G11B5/6088G11B2005/0021
    • There is provided a thermally assisted magnetic recording device capable of preventing collision between a thermally assisted magnetic recording head and a disk due to thermal deformation of a near-field transducer. The thermally assisted magnetic recording device includes a temperature sensor for measuring the temperature in the vicinity of the near-field transducer, a table that stores the relationship between temperature and deformation in the vicinity of the near-field transducer, and a control unit. The control unit calculates the deformation in the vicinity of the near-field transducer, from the temperature measured by the temperature sensor and the relationship between temperature and deformation stored in the table. Then, the control unit drives the flying height control actuator according to the calculated deformation to control the distance between the thermally assisted magnetic recording and the disk in order to avoid contact between them.
    • 提供了一种热辅助磁记录装置,其能够防止由于近场换能器的热变形引起的热辅助磁记录头与盘的碰撞。 热辅助磁记录装置包括用于测量近场换能器附近的温度的温度传感器,存储近场换能器附近的温度与变形之间的关系的表以及控制单元。 控制单元根据由温度传感器测量的温度和存储在表中的温度与变形之间的关系来计算近场换能器附近的变形。 然后,控制单元根据计算出的变形驱动飞行高度控制致动器,以控制热辅助磁记录与盘之间的距离,以避免它们之间的接触。
    • 125. 发明授权
    • Thermally assisted magnetic recording system
    • 热辅助磁记录系统
    • US07773331B2
    • 2010-08-10
    • US11774350
    • 2007-07-06
    • Fumiko AkagiTakuya MatsumotoKimio Nakamura
    • Fumiko AkagiTakuya MatsumotoKimio Nakamura
    • G11B5/02
    • G11B5/1278G11B2005/001G11B2005/0021
    • The optimum head-field intensity for saturation recording is assumed to be 560×103 A/m or more. Under a condition where the recording track width of an information recording medium is equal to or less than 60 nm, the optimum head-field intensity Y satisfies the following inequalities (1) and (2): Y≧(X2−119×X+4135)×1000  (1) Y≦(X2−119×X+const)×1000  (2) where X denotes the nondimensional value of the recording track width divided by 10−9 m, and Y denotes a magnetic field (expressed in units of A/m) which a magnetic pole for head-field application applies to the center of the information recording medium in the direction of the thickness thereof. Note that const=−0.8×v2+33.7×v+4250 if the relative velocity v between the head and the medium at the position of the head is less than 20 m/sec, or const=4600 if the velocity v is equal to or more than 20 m/sec.
    • 饱和记录的最佳头场强度假定为560×103A / m以上。 在信息记录介质的记录磁道宽度等于或小于60nm的条件下,最佳磁头强度Y满足以下不等式(1)和(2):Y≥(X2-119×X + 4135)×1000(1)Y≦̸(X2-119×X + const)×1000(2)其中X表示记录轨道宽度的无量纲除以10-9μm,Y表示磁场 用于头场施加的磁极的A / m的单位在信息记录介质的厚度方向上施加到信息记录介质的中心。 注意,如果头部和头部位置之间的头部和介质之间的相对速度v小于20 m / sec,则const = -0.8×v2 + 33.7×v + 4250,如果速度v等于,则const = 4600 或超过20米/秒。