scholarly journals High areal bit density perpendicular magnetic recording on hard disk

1991 ◽  
Vol 27 (6) ◽  
pp. 5292-5294 ◽  
Author(s):  
S. Yamamoto ◽  
H. Muraoka ◽  
Y. Nakamura
Keyword(s):  
Magnetic Recording ◽  
Hard Disk ◽  
Perpendicular Magnetic Recording

Extendibility of traditional perpendicular magnetic recording for hard disk drives

2011 ◽  
Vol 109 (7) ◽  
pp. 07B774
Author(s):  
James A. Bain ◽  
B. V. K. Vijaya Kumar ◽  
Yu Cai ◽  
Seungjune Jeon ◽  
Ken Mai ◽  
...  
Keyword(s):  
Magnetic Recording ◽  
Hard Disk Drives ◽  
Hard Disk ◽  
Disk Drives ◽  
Perpendicular Magnetic Recording

Stress Induced Permanent Magnetic Signal Degradation of Perpendicular Magnetic Recording System

2008 ◽  
Vol 131 (1) ◽  
Author(s):  
Sung-Chang Lee ◽  
Soo-Youl Hong ◽  
Na-Young Kim ◽  
Joerg Ferber ◽  
Xiadong Che ◽  
...  
Keyword(s):  
Magnetic Recording ◽  
Hard Disk Drives ◽  
Magnetic Layer ◽  
Mechanical Damage ◽  
Hard Disk ◽  
Disk Drive ◽  
Magnetic Signal ◽  
Perpendicular Magnetic Recording ◽  
Signal Degradation ◽  
The Media

Model scratches of the size found in hard disk drives are produced under controlled conditions at a series of applied loads on both longitudinal magnetic recording (LMR) media and perpendicular magnetic recording (PMR) media using a diamond tip. The scratches are created at low speed, eliminating thermal considerations from the interpretation of the media response. Nanoindentations are produced as well. The scratches and indentations are characterized by atomic force microscope (AFM), magnetic force microscope (MFM), and also by the same magnetic reader and writer used in an integrated hard disk drive (HDD). A comparison of the response of PMR and LMR media shows the PMR media to have larger scratches and greater magnetic signal degradation than LMR media for a given scratch load. The extent of magnetic damage, as measured by MFM, is greater than the extent of surface mechanical damage, as measured by AFM. Analysis of scratches using the HDD reveals that the magnetic damage is irreversible and permanent damage in magnetic layer, which is confirmed by cross section transmission electron microscope image. The experiments reveal the mechanism for magnetic scratch erasure in the absence of thermal effects. This understanding is expected to lead to improved designs for mechanical scratch robustness of next-generation PMR media.

Perpendicular magnetic recording hard disk media using ferrite substrate

1994 ◽  
Vol 134 (2-3) ◽  
pp. 310-314 ◽  
Author(s):  
Yoshihisa Nakamura ◽  
Setsuo Yamamoto ◽  
Hiroaki Muraoka ◽  
Isao Watanabe ◽  
Hideo Fujii
Keyword(s):  
Magnetic Recording ◽  
Hard Disk ◽  
Perpendicular Magnetic Recording ◽  
Ferrite Substrate

scholarly journals Cobalt Ferrite Thin Film Hard Disk for High-Density Perpendicular Magnetic Recording

1998 ◽  
Vol 22 (S_1_ISFA_97) ◽  
pp. S1_113-116 ◽  
Author(s):  
S. YAMAMOTO ◽  
T. ANDOU ◽  
H. KURISU ◽  
M. MATSUURA ◽  
T. DOI ◽  
...  
Keyword(s):  
Thin Film ◽  
Magnetic Recording ◽  
Cobalt Ferrite ◽  
Hard Disk ◽  
High Density ◽  
Perpendicular Magnetic Recording
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