The Experts below are selected from a list of 249 Experts worldwide ranked by ideXlab platform

T C Chong - One of the best experts on this subject based on the ideXlab platform.

  • The role of slider/disk roughness in 1 Tb/In.2 magnetic recording
    Tribology Transactions, 2020
    Co-Authors: Hui Li, Jlanhua Li, T C Chong
    Abstract:

    To achieve 1 Tb/in.2 magnetic recording areal density, the head/disk spacing, or the flying height of the slider, has become so small that both the disk surface roughness and the slider air-bearing surface roughness need to be considered. In this region, the Intermolecular Force and the contact Force become more significant due to the roughness of the two surfaces. This article targets two points: 1) slider/disk roughness effects on Intermolecular Force and 2) slider/disk roughness requirement for 1 Tb/in.2 areal density. A probability model is built to simulate the Intermolecular Force and the contact Force, and these two Forces are introduced into the modified compressible Reynolds equation governing the air-bearing pressure of the slider. The equation is solved by the finite volume method based on an unstructured triangle-based mesh. The simulation results show that in 1 Tb/in.2 areal density magnetic recording the effects of slider/disk roughness on the Intermolecular Force are negligible. Smaller R a...

  • Intermolecular Force surface roughness and stability of head disk interface
    Journal of Applied Physics, 2005
    Co-Authors: Hui Li, T C Chong
    Abstract:

    To achieve 1-Tb∕in.2 magnetic recording areal density, the head/disk spacing, or the flying height (FH) of the slider has to be reduced to 2–3nm and the disk surface roughness and the slider air bearing surface (ABS) roughness need to be well considered when the flying height is in such a regime. This paper presents authors’ efforts in further study of the Intermolecular Force effects with the surface roughness in consideration and the investigation of the contact Force caused by the surface roughness effects. A probability model is built to simulate the Intermolecular Force and the contact Force, and these two Forces are introduced into the modified compressible Reynolds equation governing the air bearing pressure of the slider. The simulation results show that the effects of slider/disk roughness on the Intermolecular Force are negligible. On the other hand, surface roughness plays important roles in the contact Force and the contact vibration. Reducing the roughness of both the slider and the disk surf...

Weidong Zhou - One of the best experts on this subject based on the ideXlab platform.

  • Energy analysis on flying stability of sub-5-nm air bearing slider
    IEEE Transactions on Magnetics, 2009
    Co-Authors: Wei Hua, Bo Liu, Shengkai Yu, Weidong Zhou
    Abstract:

    This paper presents a new method to study the flying stabilities of air bearing sliders. Various Forces on the slider are analyzed, and their work on the slider is calculated quantitatively. The contributions of the Forces to the flying stabilities of the slider are evaluated according to their work on the slider. It is observed that the air bearing Force plays a dominant role on the flying stabilities of slider, while the friction Force and the Intermolecular Force do positive work, which destabilize the flying slider. In order to improve the flying stabilities of sub-5-nm air bearing slider, the friction Force and the Intermolecular Force should be reduced as much as possible.

  • Stabilities of sub-5 nm air bearing slider
    2009 Asia-Pacific Magnetic Recording Conference, 2009
    Co-Authors: Shengkai Yu, Weidong Zhou
    Abstract:

    The work done by various Forces acting on the air bearing slider are analyzed and calculated, and their contributions to the flying stabilities of a sub-5 nm air bearing slider are evaluated quantitatively. It is found that the air bearing Force plays an important role on the slider's flying stabilities, while the Intermolecular Force and the friction Force tend to excite the slider bouncing.

  • probability model for the Intermolecular Force with surface roughness considered
    Tribology International, 2007
    Co-Authors: Shengkai Yu, Weidong Zhou
    Abstract:

    Abstract This paper studies the Intermolecular Force considering both the roughness of the air-bearing surface and the disk surface by simulation. A model is developed to deal with the Intermolecular Force, the contact Force and the air-bearing Force based on the probability distributions of the roughness of the surfaces. The Intermolecular Force is linked with the contact Force when its repulsive term is stronger than its attractive term. In such a case, all the Intermolecular Force, the contact Force and the air-bearing Force can be extended to the various flying height regions. Some interesting results are observed and discussed. It is found that both the Hamaker constant and the surface roughness have significant influences on the Intermolecular pressure. Compared with the Intermolecular pressure with smooth surfaces, that with the surface roughness considered shows greater attractive pressure at the flying height higher than 0.7 nm approximately, but much smaller values between 0.26 and 0.7 nm approximately. A negative stiffness region exists when the minimum flying height is between −0.2 and 1.2 nm for the case studied in this paper. It shows that the Probability Model is suitable for the Intermolecular Force calculation with the surface roughness considered.

Hui Li - One of the best experts on this subject based on the ideXlab platform.

  • The role of slider/disk roughness in 1 Tb/In.2 magnetic recording
    Tribology Transactions, 2020
    Co-Authors: Hui Li, Jlanhua Li, T C Chong
    Abstract:

    To achieve 1 Tb/in.2 magnetic recording areal density, the head/disk spacing, or the flying height of the slider, has become so small that both the disk surface roughness and the slider air-bearing surface roughness need to be considered. In this region, the Intermolecular Force and the contact Force become more significant due to the roughness of the two surfaces. This article targets two points: 1) slider/disk roughness effects on Intermolecular Force and 2) slider/disk roughness requirement for 1 Tb/in.2 areal density. A probability model is built to simulate the Intermolecular Force and the contact Force, and these two Forces are introduced into the modified compressible Reynolds equation governing the air-bearing pressure of the slider. The equation is solved by the finite volume method based on an unstructured triangle-based mesh. The simulation results show that in 1 Tb/in.2 areal density magnetic recording the effects of slider/disk roughness on the Intermolecular Force are negligible. Smaller R a...

  • Intermolecular Force surface roughness and stability of head disk interface
    Journal of Applied Physics, 2005
    Co-Authors: Hui Li, T C Chong
    Abstract:

    To achieve 1-Tb∕in.2 magnetic recording areal density, the head/disk spacing, or the flying height (FH) of the slider has to be reduced to 2–3nm and the disk surface roughness and the slider air bearing surface (ABS) roughness need to be well considered when the flying height is in such a regime. This paper presents authors’ efforts in further study of the Intermolecular Force effects with the surface roughness in consideration and the investigation of the contact Force caused by the surface roughness effects. A probability model is built to simulate the Intermolecular Force and the contact Force, and these two Forces are introduced into the modified compressible Reynolds equation governing the air bearing pressure of the slider. The simulation results show that the effects of slider/disk roughness on the Intermolecular Force are negligible. On the other hand, surface roughness plays important roles in the contact Force and the contact vibration. Reducing the roughness of both the slider and the disk surf...

Shengkai Yu - One of the best experts on this subject based on the ideXlab platform.

  • Influences of Surface Topography on the Flying Performances of a Sub-3 nm Air Bearing Slider
    Japanese Journal of Applied Physics, 2010
    Co-Authors: Shengkai Yu
    Abstract:

    This paper studies the influences of the surface roughness and waviness on the static and dynamic flying performances of a thermal protrusion slider with flying height under 3 nm. Simulations show that the air bearing Force and the contact Force are proportional to the average roughness values of the surfaces, while the Intermolecular Force or the electrostatic Force are the smallest for the smoothest surfaces when the minimum flying height is above a certain value. As a result, the total Force on the slider is the largest on the smoothest surfaces in a certain minimum flying height region. When the minimum flying height is designed in this region, the flying ability of the slider is maximized. The energy analysis method is introduced to study the influences of the surface waviness on the dynamic performances of the slider. It is observed that the surface waviness may excite the slider to the bouncing state. The kinetic energy for maintaining the slider in the bouncing state comes mainly from the Intermolecular Force, while the air bearing Force plays an important role in stabilizing the slider. The contributions of other Forces, such as the friction Force and the contact Force, are also evaluated quantitatively. In order to improve the flying stabilities of the slider, the Intermolecular Force, the friction Force and the electrostatic Force should be reduced as much as possible.

  • Energy analysis on flying stability of sub-5-nm air bearing slider
    IEEE Transactions on Magnetics, 2009
    Co-Authors: Wei Hua, Bo Liu, Shengkai Yu, Weidong Zhou
    Abstract:

    This paper presents a new method to study the flying stabilities of air bearing sliders. Various Forces on the slider are analyzed, and their work on the slider is calculated quantitatively. The contributions of the Forces to the flying stabilities of the slider are evaluated according to their work on the slider. It is observed that the air bearing Force plays a dominant role on the flying stabilities of slider, while the friction Force and the Intermolecular Force do positive work, which destabilize the flying slider. In order to improve the flying stabilities of sub-5-nm air bearing slider, the friction Force and the Intermolecular Force should be reduced as much as possible.

  • Stabilities of sub-5 nm air bearing slider
    2009 Asia-Pacific Magnetic Recording Conference, 2009
    Co-Authors: Shengkai Yu, Weidong Zhou
    Abstract:

    The work done by various Forces acting on the air bearing slider are analyzed and calculated, and their contributions to the flying stabilities of a sub-5 nm air bearing slider are evaluated quantitatively. It is found that the air bearing Force plays an important role on the slider's flying stabilities, while the Intermolecular Force and the friction Force tend to excite the slider bouncing.

  • probability model for the Intermolecular Force with surface roughness considered
    Tribology International, 2007
    Co-Authors: Shengkai Yu, Weidong Zhou
    Abstract:

    Abstract This paper studies the Intermolecular Force considering both the roughness of the air-bearing surface and the disk surface by simulation. A model is developed to deal with the Intermolecular Force, the contact Force and the air-bearing Force based on the probability distributions of the roughness of the surfaces. The Intermolecular Force is linked with the contact Force when its repulsive term is stronger than its attractive term. In such a case, all the Intermolecular Force, the contact Force and the air-bearing Force can be extended to the various flying height regions. Some interesting results are observed and discussed. It is found that both the Hamaker constant and the surface roughness have significant influences on the Intermolecular pressure. Compared with the Intermolecular pressure with smooth surfaces, that with the surface roughness considered shows greater attractive pressure at the flying height higher than 0.7 nm approximately, but much smaller values between 0.26 and 0.7 nm approximately. A negative stiffness region exists when the minimum flying height is between −0.2 and 1.2 nm for the case studied in this paper. It shows that the Probability Model is suitable for the Intermolecular Force calculation with the surface roughness considered.

Yuki Shimizu - One of the best experts on this subject based on the ideXlab platform.

  • numerical simulation of effect of roughness texture of slider surface on Intermolecular Force
    Microsystem Technologies-micro-and Nanosystems-information Storage and Processing Systems, 2007
    Co-Authors: Jianhua Li, Junguo Xu, Yuki Shimizu
    Abstract:

    We investigated that what influence surface roughness had on the Intermolecular Forces acting at the head/disk interface. A model was developed based on a probabilistic description of the slider and disk surfaces. The results obtained from our research indicated that a rougher surface for the slider increased the Intermolecular Force slightely more than a smooth surface did. The Intermolecular Force on the slider was decreased by shifting the slider’s mean plane. We concluded that it was possible in practice to design an air bearing surface with a lower Intermolecular Force using a smooth but narrower trailing-edge-pad, a textured/rough trailing pad with at least a 2-nm mean plane shift and a pitch angle designed larger than 100 μrad.

  • Numerical simulation of effect of roughness/texture of slider surface on Intermolecular Force
    Microsystem Technologies-micro-and Nanosystems-information Storage and Processing Systems, 2007
    Co-Authors: Jianhua Li, Junguo Xu, Yuki Shimizu
    Abstract:

    We investigated that what influence surface roughness had on the Intermolecular Forces acting at the head/disk interface. A model was developed based on a probabilistic description of the slider and disk surfaces. The results obtained from our research indicated that a rougher surface for the slider increased the Intermolecular Force slightely more than a smooth surface did. The Intermolecular Force on the slider was decreased by shifting the slider’s mean plane. We concluded that it was possible in practice to design an air bearing surface with a lower Intermolecular Force using a smooth but narrower trailing-edge-pad, a textured/rough trailing pad with at least a 2-nm mean plane shift and a pitch angle designed larger than 100 μrad.