Skip to main content
SpringerLink
Log in

Design theory and vibration characteristics of a contact head slider

  • Technical Paper
  • Published:
Microsystem Technologies Aims and scope Submit manuscript

Abstract

In this study, the design theory of a previously proposed contact head slider was extended by considering a thermally protruding head slider and the intermolecular adhesive force between the head and disk surfaces. The waviness-excited vibration characteristics of the thermally protruding contact head slider were analyzed using a single-degree-of-freedom slider model, whose contact stiffness was calculated in accordance with the Johnson–Kendall–Roberts adhesive contact theory. It was found that, because of the adhesive force, the resonance frequency f r of the contact slider changed from zero to a value higher than the original second-pitch-mode resonance frequency with an increase in the head-penetration depth. Because the waviness-excited vibration of the contact slider is amplified at f r , the first- and second-pitch-mode vibrations of the thermally protruding slider can be excited when f r approaches those resonance frequencies. Because the friction force varies with the vibration of the contact slider, vibration modes of the slider-suspension system often observed at the beginning of contact can be explained. It is suggested that the region of the head-penetration depth for perfect contact sliding can be widened by increasing the effective contact damping and decreasing the disk waviness.

This is a preview of subscription content, log in via an institution to check access.

Access this article

Log in via an institution

Price excludes VAT (USA)
Tax calculation will be finalised during checkout.

Instant access to the full article PDF.

Institutional subscriptions

Fig. 1
Fig. 2
Fig. 3
Fig. 4
Fig. 5
Fig. 6
Fig. 7
Fig. 8
Fig. 9
Fig. 10
Fig. 11

Similar content being viewed by others

Abbreviations

A(f k ):

Amplitude of disk-waviness at frequency f k (m)

E * :

Composite Young’s modulus in contacting system (Pa)

B :

Ratio of rms value of head–disk spacing displacement, σ h , to that of disk waviness, σ d

F :

Total force acting on spherical head (sum of surface attractive force, elastic reacting force, and air-bearing force) (N)

F H :

External force or reacting force in Hertzian contact (N)

F JKR :

Sum of surface attractive force and elastic reacting force, based on Johnson–Kendall–Roberts theory (N)

H 1 (f k ):

Amplitude of frequency–response function of relative displacement of contact head to disk-waviness amplitude

H 2 (f k ):

Amplitude of frequency–response function of absolute displacement of contact head to disk-waviness amplitude

J G :

Moment of inertia about center of mass of head slider (kg · m2)

R :

Radius of curvature of spherical head (m)

a :

Contact radius of spherical head with a disk (m)

c ef :

Effective damping ratio of head–disk contact (N · s/m)

d h :

Position of read/write head (m)

d 1 :

Center of pressure of front air-bearing pad (m)

d 2 :

Center of pressure of rear air-bearing pad (m)

f k :

Frequency of disk waviness (Hz)

f 1 :

Minimum frequency for evaluating disk waviness (Hz)

f N+1 :

Maximum frequency for evaluating disk waviness (Hz)

f P1 :

Natural frequency of the first-pitch mode of flying head slider (Hz)

f P2 :

Natural frequency of the second-pitch mode of flying head slider in flying and contacting states (Hz)

f r :

Natural frequency (resonance frequency) of contact slider (Hz)

h :

Spacing (relative displacement) between contact head and disk surface (m)

k a :

Air-bearing stiffness (N/m)

k c :

Contact stiffness, including effects of surface attractive force and elastic reacting force, calculated from Johnson–Kendall–Roberts theory (N/m)

k ef :

Effective stiffness, including effects of surface attractive force, elastic reacting force, and air-bearing force (N/m)

k efm :

Effective mean stiffness of contact slider (N/m)

k s :

Stiffness of head suspension (N/m)

m ef :

Effective mass of single-degree-of-freedom model of contact head slider (kg)

p 1 :

Position of the first-pitch mode node point of head slider (m)

p 2 :

Position of the second-pitch mode node point of head slider (m)

p max :

Maximum contact pressure of mean height surface calculated from Hertzian contact theory (Pa)

z :

Position of apex of spherical contact head normal to disk surface (m)

z d :

Height of disk waviness from mean height of disk surface (m)

z 0 :

Atomic equilibrium distance (m)

β :

Roll-off factor for frequency characteristics of disk waviness

δ :

Head-penetration depth of contact slider (m)

ζ :

Effective damping ratio of contactslider

Δγ :

Reduction in surface energy when two mating surfaces come in contact (N/m)

μ :

Tabor parameter (μ = (RΔγ 2/E *2 z 3 0 )1/3)

σ a :

Rms value of roughness asperity height (m)

σ d :

Rms value of disk waviness amplitude (m)

σ h :

Rms value of head–disk spacing (m)

σ r :

Rms value of surface roughness height (m)

References

  • Canchi SV, Bogy DB (2010) Slider dynamics in the lubricant-contact regime. IEEE Trans Magn 46(3):764–769

    Article  Google Scholar 

  • Canchi SV, and Bogy DB (2011) Thermal fly-height control slider instability and dynamics at touchdown: explanations using nonlinear system theory. ASME J Tribol 133(23):021902(1–13)

    Google Scholar 

  • Canchi SV, Bogy DB (2012) Experiments on slider-lubricant interactions and lubricant transfer using TFC sliders. Microsyst Technol 18(9–10):1517–1523

    Article  Google Scholar 

  • Iida K, Ono K (2003) Design consideration of contact/near-contact sliders based on a rough surface contact model. ASME J Tribol 125(3):562–570

    Google Scholar 

  • Itoh J, Tanimoto K, Ohtsubo Y (1997) Development of contact recording head for HDD. IEEE Trans Magn 33(5):3139–3141

    Article  Google Scholar 

  • Johnson KL, Kendall K, Roberts AD (1971) Surface energy and the contact of elastic solids. Proc Royal Soc London Ser A 324:301–313

    Article  Google Scholar 

  • Juang J-Y, Nakamura T, Knigge B, Luo Y, Hsiao W-C, Kuroki K, Huang F-Y, Baumgart P (2008) Numerical and experimental analyses of nanometer-scale flying height control of magnetic head with heating element. IEEE Trans Mag 44(11):3679–3682

    Article  Google Scholar 

  • Kurita T, Shiramatsu K, Miyake A, Kato M, Soga H, Tanaka S, Saegusa S, Suk M (2006) Active flying-height control slider using MEMS thermal actuator. Microsyst Technol 12(4):369–375

    Article  Google Scholar 

  • Liu B, Zhang MS, Yu SK, Hua W, Wong CH, Zhou WD, Man YJ, Ma YS (2008) Towards fly- and lubricant contact recording. J Magn Magn Mater 320:3183–3188

    Article  Google Scholar 

  • Liu B, Zhang MS, Yu SK, Hua W, Ma YS, Zhou WD, Gonzaga L, Man YJ (2009) Lube-surfing recording and its feasibility exploration. IEEE Trans Magn 45(2):899–904

    Article  Google Scholar 

  • Ma Y, Liu B (2011) Experimental study of slider-disk interaction process with thermal-flying-height controlled slider. Microsyst Technol 17(5–7):965–969

    Article  Google Scholar 

  • Mate CM (2008) Tribology in Small Scale, Oxford University Press, p 260

  • Ono K (2004) Design considerations of a contact slider and bouncing vibration in near-contact regime. IEEE Trans Magn 40(4):3136–3141

    Article  Google Scholar 

  • Ono K (2008) Effect of van der Waals forces in a near contact head-disk interface. IEEE Trans Magn 44(11):3675–3678

    Article  Google Scholar 

  • Ono K (2011) Numerical analysis of contact characteristics of spherically protruded head and magnetic disk. ITC2011 Hiroshima, Extended Abstract B1-02 (USB Memory)

  • Ono K (2012) Numerical method of analyzing contact mechanics between a sphere and a flat considering Lennard–Jones surface forces of contacting asperities and non contacting rough surfaces. ASME J Tribol 134(1):011402

    Article  Google Scholar 

  • Ono K, Iida K (2000) Statistical analysis of perfect contact and wear durability conditions of a single-degree-of-freedom contact slider. ASME J Tribol 122(2):238–245

    Article  Google Scholar 

  • Ono K, Maruyama H (1998) An experimental study about the bouncing vibration of a contact slider. Adv Inf Storage Sys 8:33–48

    Article  Google Scholar 

  • Ono K, Takahashi K (1999) Analysis of bouncing vibrations of a 2-DOF Tripad contact slider model with air bearing pads over a harmonic wavy disk surface. ASME J Tribol 121(4):939–947

    Article  Google Scholar 

  • Ono K, Yamane M (2007) Experimental and theoretical investigation of bouncing vibrations of a flying head slider in the near-contact region. ASME J Tribol 129(2):246–255

    Article  Google Scholar 

  • Ono K, and Yamane M (2009a) Erratum: experimental and theoretical investigation of bouncing vibrations of a flying head slider in the near-contact region ASME J Tribol 129(2):246–255

    Google Scholar 

  • Ono K, and Yamane M (2009b) Erratum: experimental and theoretical investigation of bouncing vibrations of a flying head slider in the near-contact region. ASME J Tribol 131(3):037002(1)

    Google Scholar 

  • Ono K, Takahashi K, Iida K (1999a) Computer analysis of bouncing vibration and tracking characteristics of a point contact slider model over random disk surface. ASME J Tribol 121(3):587–595

    Article  Google Scholar 

  • Ono K, Iida K, Takahashi K (1999b) Effects of design parameters on bouncing vibrations of a Single-DOF contact slider and necessary design conditions for perfect contact sliding. ASME J Tribol 121(3):596–603

    Article  Google Scholar 

  • Sato A, Ajiki K, Yanagisawa M, Tsukamoto Y (1997) Head-disk interface design for in-contact recording using wet systems. IEEE Trans Magn 33(5):3163–3165

    Article  Google Scholar 

  • Shimizu Y, Xu J, Kohira H, Kuroki K, Ono K (2011a) Experimental study on slider dynamics during touchdown by using thermal flying-height control. Microsyst Technol 17(5–7):897–902

    Article  Google Scholar 

  • Shimizu Y, Xu J, Kohira H, Kurita M, Shiramatsu T, Furukawa M (2011b) Nano-Scale defect mapping on a magnetic disk surface using a contact sensor. IEEE Trans Magn 47(10):3426–3432

    Article  Google Scholar 

  • Tabor D (1977) Surface forces and surface interactions. J Colloid Interface Sci 58(1):2–13

    Article  Google Scholar 

  • Tani H, Yamaguchi T, Tagawa H (2011) Experimental study of head-disk interface instability on light contact recording using dynamic flying height control. IEEE Trans Magn 47(1):117–123

    Article  Google Scholar 

  • Vakis AI, Lee S-C, Polycarpou AA (2009) Dynamic head-disk interface instabilities with friction for light contact (surfing) recording. IEEE Trans Magn 45(11):4966–4971

    Article  Google Scholar 

  • Yamane M, Ono K (2003) Analysis of tracking characteristics and optimum design of tri-pad slider to micro-waviness. ASME J Tribol 125(1):152–161

    Article  Google Scholar 

  • Yu SK, Liu B, Zhou WD, Hua W, Gonzaga L (2009) Dynamic Stability Analysis for Surfing Head-Disk Interface. IEEE Trans Magn 45(11):4979–4983

    Article  Google Scholar 

  • Zheng J, Bogy DB (2010) Investigation of flying-height stability of thermal fly-height control sliders in lubricant or solid contact with roughness. Tribol Lett 38:283–289

    Article  Google Scholar 

  • Zheng J, Bogy DB (2012) Dynamic instability of thermal-flying-height control sliders at touchdown. Microsyst Technol 18(9–10):1319–1322

    Article  Google Scholar 

Download references

Acknowledgments

This work was supported by JSPS Grant-in-Aid for Scientific Research (C)No. 24560154.

Author information

Authors and Affiliations

  1. 2-27-4 Nanyodai, Hachioji-shi, Tokyo, 192-0371, Japan

    Kyosuke Ono

Authors
  1. Kyosuke Ono
    View author publications

    You can also search for this author in PubMed Google Scholar

Corresponding author

Correspondence to Kyosuke Ono.

Rights and permissions

Reprints and permissions

About this article

Cite this article

Ono, K. Design theory and vibration characteristics of a contact head slider. Microsyst Technol 19, 1275–1287 (2013). https://doi.org/10.1007/s00542-013-1744-9

Download citation

  • Received:

  • Accepted:

  • Published:

  • Issue Date:

  • DOI: https://doi.org/10.1007/s00542-013-1744-9

Keywords

Search

Navigation