An Experimental Study of Head Instabilities in TMR Sensors for Magnetic Recording Heads with Adaptive Flying Height

2008 ◽  
Vol E91-C (12) ◽  
pp. 1958-1965 ◽  
Author(s):  
D. TONGSOMPORN ◽  
N. AFZULPURKAR ◽  
B. BARGMANN ◽  
L. LEKAWAT ◽  
A. SIRITARATIWAT
Keyword(s):  
Experimental Study ◽  
Magnetic Recording ◽  
Flying Height ◽  
Recording Heads ◽  
Magnetic Recording Heads

Overview of Fly Height Control Applications in Perpendicular Magnetic Recording

2007 ◽  
Vol 43 (2) ◽  
pp. 709-714 ◽  
Author(s):  
Yawshing Tang ◽  
Soo-Youl Hong ◽  
Na-Young Kim ◽  
Xiaodong Che
Keyword(s):  
Magnetic Recording ◽  
Control Applications ◽  
Height Control ◽  
Perpendicular Magnetic Recording ◽  
Fly Height

Experimental Study of Nanoscale Head-Disk Heat Transfer In Heat-Assisted Magnetic Recording

2021 ◽  
Author(s):  
Qilong Cheng ◽  
David B. Bogy
Keyword(s):  
Heat Transfer ◽  
Silicon Wafer ◽  
Magnetic Recording ◽  
Laser Exposure ◽  
Heat Assisted Magnetic Recording ◽  
Contact Sensor ◽  
Higher Temperature ◽  
Dc Current ◽  
Fly Height ◽  
Head Temperature

Abstract To study the nanoscale heat transfer and laser-related protrusions in heat-assisted magnetic recording (HAMR), we performed static touchdown experiments between HAMR waveguide heads and non-rotating media such as a silicon wafer and a recording disk with an AlMg substrate. During the static touchdown, the laser element is energized with DC current and the embedded contact sensor (ECS) is used to monitor the head temperature. The experimental results show that the thermal fly-height control (TFC) touchdown power decreases with increasing laser current. Meanwhile, the head temperature increases due to the laser heating. From this the ECS resistance rise induced by the laser is extracted. The results show that the silicon wafer dissipates heat effectively under the laser exposure, while the AlMg-substrate disk undergoes a higher temperature rise, which in turn heats the head.

Slider Pitch Moment Associated With Dimple Friction

2006 ◽  
Vol 128 (4) ◽  
pp. 705-710 ◽  
Author(s):  
Li-Yan Zhu ◽  
Chao-Hui Yang ◽  
Yen Fu ◽  
Ellis Cha
Keyword(s):  
Magnetic Recording ◽  
Beam Theory ◽  
Disk File ◽  
Height Distribution ◽  
Lever Arm ◽  
Pitch Moment ◽  
Fly Height

In the design of a magnetic recording disk file, pitch moment exerted by the flexure on the slider is usually treated as a product of flexure pitch static attitude and pitch-stiffness (kp), both measured in the absence of preload (gram-load). However, a slider operates in the presence of preload, which permits a large dimple friction to exist. We shall show by elementary beam theory that the pitch moment due to dimple friction is appreciable. The lever-arm of dimple friction is proportional to the bow height, and is independent of the slope of the flexure. To minimize the pitch moment associated with dimple friction, hence improving fly-height distribution, the flexure must bow toward the disk. These results are confirmed by optical fly-height tests.

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