Static and Dynamic Slider Air-Bearing Behavior in Heat-Assisted Magnetic Recording Under Thermal Flying Height Control and Laser System-Induced Protrusion

2014 ◽  
Vol 54 (1) ◽  
pp. 35-50 ◽  
Author(s):  
Joanna Bechtel Dahl ◽  
David B. Bogy
Keyword(s):  
Magnetic Recording ◽  
Laser System ◽  
Flying Height ◽  
Air Bearing ◽  
Heat Assisted Magnetic Recording ◽  
Height Control ◽  
Thermal Flying Height Control ◽  
Slider Air Bearing ◽  
Bearing Behavior

Air Bearing Pushback in Heat Assisted Magnetic Recording

2019 ◽  
Author(s):  
Shaomin Xiong ◽  
Robert Smith ◽  
Chanh Nguyen ◽  
Youfeng Zhang ◽  
Yeoungchin Yoon
Keyword(s):  
Magnetic Recording ◽  
Hard Disk Drives ◽  
Hard Disk ◽  
Disk Drive ◽  
Flying Height ◽  
Air Bearing ◽  
Magnetic Media ◽  
Heat Assisted Magnetic Recording ◽  
Height Control ◽  
Different Dimensions

Abstract The air bearing surface is critical to the spacing control in current hard disk drives (HDDs). Thermal protrusions, including thermal flying height control (TFC) and writer coil protrusion, drive the reader/writer elements closer to the magnetic media. The spacing control actuation efficiency depends on the air bearing push back response after the TFC or writer protrudes. In the next generation hard disk drive technology, heat assisted magnetic recording (HAMR), laser induced protrusions further complicate the spacing control. The laser induced protrusions, such as the localized NFT protrusion and a wider change of the crown and camber, have very different dimensions and transient characteristics than the traditional TFC and writer protrusion. The dimension of the NFT protrusion is relatively smaller, and the transient is much faster than the TFC protrusion. However, it is found that the NFT protrusion is large enough to generate an air bearing push back effect, which changes the read and write spacing when the laser is powered on. To accurately control spacing in HAMR, this push back effect has to be taken into account.

Slit Design for the Thermal Flying Height Control Slider

2013 ◽  
Author(s):  
Hui Li ◽  
Shengnan Shen
Keyword(s):  
Magnetic Recording ◽  
Thermal Structure ◽  
Areal Density ◽  
Thermal Actuator ◽  
Flying Height ◽  
Air Bearing ◽  
Disk Drives ◽  
Height Control ◽  
Thermal Flying Height Control ◽  
Structure Simulation

Thermal flying height control (TFC) has recently been implemented in magnetic recording disk drives to reduce the flying height at the read/write element for high areal density magnetic recording. In this work, we propose a novel thermal flying height control slider, by designing a slit near the thermal heater in the slider. The thermal-structure simulation coupled with air bearing simulation is used to simulate the actuation by the thermal actuator, as well as the effects on flying performance of slider being actuated.

Performance of Sliders Flying Over Discrete-Track Media

2007 ◽  
Vol 129 (4) ◽  
pp. 712-719 ◽  
Author(s):  
Jianhua Li ◽  
Junguo Xu ◽  
Yuki Shimizu
Keyword(s):  
Estimation Method ◽  
Simulation Method ◽  
Measured Data ◽  
Flying Height ◽  
Height Loss ◽  
Air Bearing ◽  
Slider Air Bearing ◽  
Discrete Track ◽  
Flying Attitude ◽  
Manufacturing Variation

A simulation method in which grooves are virtually distributed on the slider air bearing instead of on the grooved medium surface has been developed and used to investigate the performance of sliders flying over the surface of a discrete-track medium. The simulated flying height loss due to a discrete-track medium coincides well with the measured data, whereas the average-estimation method overestimates flying height loss. Among the characteristics of a slider flying over the surface of a discrete-track medium that were studied are the flying attitude, the effect of groove parameters on flying profile, and the flying height losses due to manufacturing variation and altitude. The results indicate that when a slider is flying over the surface of a discrete-track medium, it will have a higher 3σ of flying height, be more sensitive to altitude, and will have a greater flying height loss.

scholarly journals Investigation of Mechanical Clearance Change with Thermal Flying-height Control Slider at High Altitude

2010 ◽  
Vol 4 (1) ◽  
pp. 32-41 ◽  
Author(s):  
Satoru OOKUBO ◽  
Toshiya SHIRAMATSU ◽  
Masayuki KURITA ◽  
Hidekazu KOHIRA ◽  
Yoshinori TAKEUCHI
Keyword(s):  
High Altitude ◽  
Flying Height ◽  
Height Control ◽  
Thermal Flying Height Control ◽  
Clearance Change
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