To achieve high recording density, the combination of low flying head and smooth disk surface is very desirable. Although high stiction associated with the smooth surface can be avoided by zone texturing or ramp load, stable flying condition must be assured by a smooth disk surface. Disk topography is an important factor in the flying stability of the head. In this work, read back signal modulation analysis was incorporated to characterize the disk topography. By increasing the writing frequency up to 25 MHz, high resolution was demonstrated in the fly height range between 15 nm to 50 nm. This resolution is sufficient to evaluate today’s low flying heads. A subambient pressure design which is typical for an MR head and a proximity head design for an inductive head were evaluated over very smooth aluminum disks. The effect of various disk clamping forces was also investigated. Relationship between disk waviness and flying stability of heads was studied.

1.
Baumgart
P.
,
Krajnovich
D. J.
,
Nguyen
T. A.
, and
Tam
A. C.
,
1995
, “
A New Laser Texturing Technique for High Performance Magnetic Disk Drives
,”
IEEE Trans. of Mag.
, Vol.
Mag-31
, No.
6
, pp.
2946
2951
.
2.
Bertram, H. N., 1994, Theory of Magnetic Recording, Cambridge University Press, p. 154.
3.
Bhushan
B.
, and
Tonder
K.
,
1989
a, “
Roughness-Induced Shear- and Squeeze-Film Effect in Magnetic Recording—Part I: Analysis
,”
ASME JOURNAL OF TRIBOLOGY
, Vol.
117
, No.
2
, pp.
220
227
.
4.
Bhushan
B.
, and
Tonder
K.
,
1989
b, “
Roughness-Induced Shear- and Squeeze-Film Effect in Magnetic Recording—Part II: Applications
,”
ASME JOURNAL OF TRIBOLOGY
, Vol.
117
, No.
2
, pp.
228
237
.
5.
Matsumoto, M., 1983, Magnetic Heads and Magnetic Recording (in Japanese), Sogo Denshi Publishing #3055-70029-4285, pp. 134–135.
6.
Radwan
H. R.
,
Gibson
D. L.
, and
Malakowsky
S.
,
1991
, “
Application of the Read Back Signal Modulation Method for Fly Height Measurement
,”
ASME, Advances in Information Storage Systems
, Vol.
1
, pp.
213
230
.
7.
Ranjan
R.
,
Lambeth
D. N.
,
Tromel
M.
,
Gglia
P.
, and
Li
Y.
,
1991
, “
Laser Texturing for Low-Fly-Height Media
,”
J. Appl. Phys.
, Vol.
69
, pp.
5745
5747
.
8.
Shi
W. K.
,
Zhu
L. Y.
, and
Bogy
D. B.
,
1987
, “
Use of Read Back Signal Modulation to Measure Head/Disk Spacing Variations in Magnetic Disk Files
,”
IEEE Trans. of Magnetics
, Vol.
Mag-23
, No.
1
, pp.
233
240
.
9.
Suzuki
S.
,
Hayashi
I.
, and
Matsushita
K.
,
1993
, “
An Experimental Study of the Parameters that Determine Take-Off Velocity and CSS Performance of Thin Film Disks
,”
STLE Tribology Transactions
, Vol.
36
, No.
3
, pp.
441
416
.
10.
Suzuki
S.
, and
Nishihira
H.
,
1996
, “
Study of Slider Dynamics over Very Smooth Magnetic Disks
,”
ASME JOURNAL OF TRIBOLOGY
, Vol.
118
, No.
2
, pp.
382
387
.
11.
Xuan, J., Chen, G-L., and Nguyen, T., 1996, “Effect of Laser-Induced Discrete Texture Parameters on Optimization of HDI Tribology,” 1996 IEEE Intermag Conf. Digest HA-03.
This content is only available via PDF.
You do not currently have access to this content.