Laser-induced ripple structures on Ni-P substrates

J. J. Yu, Y. F. Lu

Research output: Contribution to journalArticle

28 Citations (Scopus)

Abstract

The ripple structures induced in Ni-P disks by 248 nm excimer laser pulses are experimentally investigated by varying laser fluence (175-270 mJ/cm2 for 150 pulses) and pulse number (400-1000 pulses for 118 mJ/cm2). A quantity [Ra/(Λ/2)] is proposed to characterize the real contact area at the head-disk interface. This quantity is defined as the ratio of roughness height Ra to half ripple period (Λ/2). The maximum shear stress and the plasticity index have been derived to analyze the ability for ripple structures to withstand stress and the head-ripple contact mode, respectively. Increasing fluence and pulse number may lead to an increase in ripple periodicity, and on the contrary, decreases in corresponding maximum shear stress, real contact area [Ra/(Λ/2)] and plasticity index. The laser parameters (fluence and pulse number) represent effective approaches to improve the tribology of the head-disk interface by controlling the laser-induced ripple pattern such as periodicity and roughness height. The laser irradiation with lower fluence and fewer pulses is helpful in producing the required ripple structure for laser texturing in magnetic media. This structure can meet the requirements of elastic contacts between head and disk, and less deformation under stress, although with a slight sacrifice in contact-area reduction.

Original languageEnglish (US)
Pages (from-to)248-252
Number of pages5
JournalApplied Surface Science
Volume148
Issue number3
DOIs
StatePublished - Jul 1999

Fingerprint

ripples
Laser pulses
Lasers
Substrates
pulses
fluence
lasers
Plasticity
Shear stress
Surface roughness
Texturing
Tribology
plastic properties
Excimer lasers
Laser beam effects
shear stress
periodic variations
roughness
tribology
excimer lasers

ASJC Scopus subject areas

  • Chemistry(all)
  • Condensed Matter Physics
  • Physics and Astronomy(all)
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films

Cite this

Laser-induced ripple structures on Ni-P substrates. / Yu, J. J.; Lu, Y. F.

In: Applied Surface Science, Vol. 148, No. 3, 07.1999, p. 248-252.

Research output: Contribution to journalArticle

@article{f52273c251e242e0ae6f509f7761d91c,
title = "Laser-induced ripple structures on Ni-P substrates",
abstract = "The ripple structures induced in Ni-P disks by 248 nm excimer laser pulses are experimentally investigated by varying laser fluence (175-270 mJ/cm2 for 150 pulses) and pulse number (400-1000 pulses for 118 mJ/cm2). A quantity [Ra/(Λ/2)] is proposed to characterize the real contact area at the head-disk interface. This quantity is defined as the ratio of roughness height Ra to half ripple period (Λ/2). The maximum shear stress and the plasticity index have been derived to analyze the ability for ripple structures to withstand stress and the head-ripple contact mode, respectively. Increasing fluence and pulse number may lead to an increase in ripple periodicity, and on the contrary, decreases in corresponding maximum shear stress, real contact area [Ra/(Λ/2)] and plasticity index. The laser parameters (fluence and pulse number) represent effective approaches to improve the tribology of the head-disk interface by controlling the laser-induced ripple pattern such as periodicity and roughness height. The laser irradiation with lower fluence and fewer pulses is helpful in producing the required ripple structure for laser texturing in magnetic media. This structure can meet the requirements of elastic contacts between head and disk, and less deformation under stress, although with a slight sacrifice in contact-area reduction.",
author = "Yu, {J. J.} and Lu, {Y. F.}",
year = "1999",
month = "7",
doi = "10.1016/S0169-4332(98)00900-3",
language = "English (US)",
volume = "148",
pages = "248--252",
journal = "Applied Surface Science",
issn = "0169-4332",
publisher = "Elsevier",
number = "3",

}

TY - JOUR

T1 - Laser-induced ripple structures on Ni-P substrates

AU - Yu, J. J.

AU - Lu, Y. F.

PY - 1999/7

Y1 - 1999/7

N2 - The ripple structures induced in Ni-P disks by 248 nm excimer laser pulses are experimentally investigated by varying laser fluence (175-270 mJ/cm2 for 150 pulses) and pulse number (400-1000 pulses for 118 mJ/cm2). A quantity [Ra/(Λ/2)] is proposed to characterize the real contact area at the head-disk interface. This quantity is defined as the ratio of roughness height Ra to half ripple period (Λ/2). The maximum shear stress and the plasticity index have been derived to analyze the ability for ripple structures to withstand stress and the head-ripple contact mode, respectively. Increasing fluence and pulse number may lead to an increase in ripple periodicity, and on the contrary, decreases in corresponding maximum shear stress, real contact area [Ra/(Λ/2)] and plasticity index. The laser parameters (fluence and pulse number) represent effective approaches to improve the tribology of the head-disk interface by controlling the laser-induced ripple pattern such as periodicity and roughness height. The laser irradiation with lower fluence and fewer pulses is helpful in producing the required ripple structure for laser texturing in magnetic media. This structure can meet the requirements of elastic contacts between head and disk, and less deformation under stress, although with a slight sacrifice in contact-area reduction.

AB - The ripple structures induced in Ni-P disks by 248 nm excimer laser pulses are experimentally investigated by varying laser fluence (175-270 mJ/cm2 for 150 pulses) and pulse number (400-1000 pulses for 118 mJ/cm2). A quantity [Ra/(Λ/2)] is proposed to characterize the real contact area at the head-disk interface. This quantity is defined as the ratio of roughness height Ra to half ripple period (Λ/2). The maximum shear stress and the plasticity index have been derived to analyze the ability for ripple structures to withstand stress and the head-ripple contact mode, respectively. Increasing fluence and pulse number may lead to an increase in ripple periodicity, and on the contrary, decreases in corresponding maximum shear stress, real contact area [Ra/(Λ/2)] and plasticity index. The laser parameters (fluence and pulse number) represent effective approaches to improve the tribology of the head-disk interface by controlling the laser-induced ripple pattern such as periodicity and roughness height. The laser irradiation with lower fluence and fewer pulses is helpful in producing the required ripple structure for laser texturing in magnetic media. This structure can meet the requirements of elastic contacts between head and disk, and less deformation under stress, although with a slight sacrifice in contact-area reduction.

UR - http://www.scopus.com/inward/record.url?scp=0032673307&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0032673307&partnerID=8YFLogxK

U2 - 10.1016/S0169-4332(98)00900-3

DO - 10.1016/S0169-4332(98)00900-3

M3 - Article

AN - SCOPUS:0032673307

VL - 148

SP - 248

EP - 252

JO - Applied Surface Science

JF - Applied Surface Science

SN - 0169-4332

IS - 3

ER -