Magnetic and thermal effects of flying height control heater voltage on tunneling magnetoresistive heads

2008 ◽  
Vol 103 (7) ◽  
pp. 07F534 ◽  
Author(s):  
Eunkyu Jang
Keyword(s):  
Thermal Effects ◽  
Flying Height ◽  
Height Control ◽  
Magnetoresistive Heads

Study of slider-defect interaction at ultralow flying height by dynamic flying height control

2009 ◽  
Vol 105 (7) ◽  
pp. 07B703 ◽  
Author(s):  
H. Tani ◽  
M. Kanda ◽  
M. Kubota ◽  
N. Tagawa
Keyword(s):  
Flying Height ◽  
Height Control ◽  
Defect Interaction

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

Thermal Behavior of Magnetoresistive Heads: An Analysis of the Thermal Asperity Problem

2001 ◽  
Author(s):  
Francis E. Kennedy ◽  
Li Chen ◽  
David B. Bogy
Keyword(s):  
Surface Topography ◽  
Temperature Variation ◽  
Frictional Heating ◽  
Flying Height ◽  
Surface Films ◽  
Asperity Contact ◽  
Contact Interface ◽  
Temperature Changes ◽  
Magnetoresistive Heads ◽  
Voltage Transient

Abstract It is well known that the resistance of a magnetoresistive (MR) or giant magnetoresistive (GMR) head, and therefore its output, varies as its temperature changes. This causes uncertainty in the interpretation of magnetic output, and this uncertainty becomes more important when an asperity or particle passes by or comes into contact with the slider, causing a voltage transient during read back. The temperature variation during non-contact is caused by changes in the cooling of the air bearing surface as the flying height changes. When contact occurs an even more significant temperature spike, called a ‘thermal asperity’ (or TA), is caused by frictional heating at the contact interface. These temperature fluctuations are analyzed in this paper. Results show that the temperature of the MR read coil is influenced by bias current in read coil, slider materials and flying height (which is sensitive to surface topography). The temperature variation without contact causes MR output signal variations which can be used to characterize surface topography. The flash temperature rise that occurs with asperity contact can be as much as 150 degrees (C) or more at the contact interface, but it lasts less than a microsecond. The magnitude of the TA temperature spike is affected by contact force, sliding velocity, and geometry and properties of slider and disk materials, including surface films.

The Flying Height Control with a Switched Controller for Data Storage Devices

2012 ◽  
Vol 424-425 ◽  
pp. 1159-1163
Author(s):  
Zhi Zheng Wu ◽  
Mei Liu
Keyword(s):  
Data Storage ◽  
Design Method ◽  
Synthesis Method ◽  
Flying Height ◽  
Linear Matrix ◽  
Experimental Setup ◽  
Matrix Inequalities ◽  
Storage Devices ◽  
Height Control ◽  
Stabilizing Controllers

This paper considers the flying height control problem for data storage devices using a switched controller. First, a set of switched -parameterized stabilizing controllers is constructed. Then a sufficient regulation condition for the switched system is obtained, and a regulator synthesis method is derived based on solving a set of properly formulated linear matrix inequalities. Finally, the proposed regulator design method is evaluated on an experimental setup motivated by the flying height regulation problem in data storage devices

Development of Active Head Slider for Flying Height Control

2002 ◽  
Vol 2002.1 (0) ◽  
pp. 263-264
Author(s):  
Kenji SUZUKI ◽  
Takayuki AKIMATSU ◽  
Kenji SASAKI
Keyword(s):  
Flying Height ◽  
Height Control ◽  
Head Slider
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