Enhancement of signal to noise ratio by underlayer control in CoCr-based perpendicular magnetic recording media

2004 ◽  
Author(s):  
Hoon-Sang Oh ◽  
Byung-Kyu Lee ◽  
Kyong-Mi Lee ◽  
Kyu-Yong Kim ◽  
No-Yeol Park
Keyword(s):  
Magnetic Recording ◽  
Signal To Noise Ratio ◽  
Recording Media ◽  
Magnetic Recording Media ◽  
Signal To Noise ◽  
Perpendicular Magnetic Recording ◽  
Noise Ratio

Si-Doping of Co/Pd Multilayers for Improved Signal to Noise in Perpendicular Magnetic Recording Media

2004 ◽  
Vol 40 (4) ◽  
pp. 2476-2479 ◽  
Author(s):  
X. Qi ◽  
B.J.H. Stadler ◽  
R.H. Victora ◽  
J.H. Judy ◽  
O. Hellwig ◽  
...  
Keyword(s):  
Magnetic Recording ◽  
Recording Media ◽  
Magnetic Recording Media ◽  
Signal To Noise ◽  
Perpendicular Magnetic Recording ◽  
Si Doping

Development of CoX/Pd multilayer perpendicular magnetic recording media with granular seed layers

2002 ◽  
Vol 242-245 ◽  
pp. 297-303 ◽  
Author(s):  
Yukiko Kubota ◽  
Dieter Weller ◽  
Mei-Ling Wu ◽  
Xiaowei Wu ◽  
Ganping Ju ◽  
...  
Keyword(s):  
Magnetic Recording ◽  
Recording Media ◽  
Magnetic Recording Media ◽  
Perpendicular Magnetic Recording ◽  
Seed Layers

Coupled Granular/Continuous Media – Results and Challenges

MRS Advances ◽  
2017 ◽  
Vol 2 (49) ◽  
pp. 2661-2668
Author(s):  
Horia Gavrila ◽  
Doina Elena Gavrila
Keyword(s):  
Thermal Stability ◽  
Grain Size ◽  
Magnetic Recording ◽  
Granular Media ◽  
Signal To Noise Ratio ◽  
Signal To Noise ◽  
Theoretical Limit ◽  
Perpendicular Recording ◽  
Perpendicular Magnetic Recording ◽  
Longitudinal Recording

ABSTRACTWhile the most promising longitudinal recording systems cannot surpass the theoretical limit of about 200 Gb/in2 for areal recording density and the demand for higher densities is permanently increasing, the perpendicular magnetic recording constitutes the realistic issue to the longitudinal one. The perpendicular magnetic recording offers significant advantages, the most important being stronger write and read fields, and therefore the use of media of higher anisotropy, smaller grain size, higher signal-to-noise ratio, and a better thermal stability. Unfortunately, the perpendicular recording has to cope some important physical and technological difficulties. To overcome them, many ingenious solutions were proposed. In this paper the coupled granular/continuous (CGC) media, a subtle association of the continuous and, respectively, granular media, are analysed from the viewpoint of their magnetic and recording properties. The challenges and possible improvements of CGC media are discussed.

Head Instability Detection for Testing Process in Perpendicular Magnetic Recording System

2013 ◽  
Vol 770 ◽  
pp. 319-322 ◽  
Author(s):  
Piya Kovintavewat ◽  
Santi Koonkarnkhai ◽  
Aimamorn Suvichakorn
Keyword(s):  
Magnetic Recording ◽  
Signal To Noise Ratio ◽  
Disk Drive ◽  
Detection Algorithm ◽  
Recording System ◽  
High Signal ◽  
Signal To Noise ◽  
Perpendicular Magnetic Recording ◽  
Read Head ◽  
Pass Through

During hard disk drive (HDD) testing process, the magneto-resistive read (MR) head is analyzed and checked if the head is defective or not. Baseline popping (BLP) is one of the crucial problems caused by head instability, whose effect can distort the readback signal to the extent of causing possible sector read failure. Without BLP detection algorithm, the defective read head might pass through HDD assembling process, thus producing an unreliable HDD. This situation must be prevented so as to retain customer satisfaction. This paper proposes a simple (but efficient) BLP detection algorithm for perpendicular magnetic recording systems. Results show that the proposed algorithm outperforms the conventional one in terms of both the percentage of detection and the percentage of false alarm, when operating at high signal-to-noise ratio.

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