scholarly journals Nanofatigue studies of ultrathin hard carbon overcoats used in magnetic storage devices

2002 ◽  
Vol 91 (10) ◽  
pp. 8334 ◽  
Author(s):  
Xiaodong Li ◽  
Bharat Bhushan
Keyword(s):  
Magnetic Storage ◽  
Hard Carbon ◽  
Storage Devices ◽  
Carbon Overcoats ◽  
Magnetic Storage Devices

Wear Modeling of Nanometer Thick Protective Coatings

2016 ◽  
Vol 139 (2) ◽  
Author(s):  
Jungkyu Lee ◽  
Youfeng Zhang ◽  
Robert M. Crone ◽  
Narayanan Ramakrishnan ◽  
Andreas A. Polycarpou
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Protective Coatings ◽  
Element Model ◽  
Disk Surface ◽  
Magnetic Storage ◽  
Theoretical Frameworks ◽  
Storage Devices ◽  
Parametric Studies ◽  
Magnetic Storage Devices

Use of nanometer thin films has received significant attention in recent years because of their advantages in controlling friction and wear. There have been significant advances in applications such as magnetic storage devices, and there is a need to explore new materials and develop experimental and theoretical frameworks to better understand nanometer thick coating systems, especially wear characteristics. In this work, a finite element model is developed to simulate the sliding wear between the protruded pole tip in a recording head (modeled as submicrometer radius cylinder) and a rigid asperity on the disk surface. Wear is defined as plastically deformed asperity and material yielding. Parametric studies reveal the effect of the cylindrical asperity geometry, material properties, and contact severity on wear. An Archard-type wear model is proposed, where the wear coefficients are directly obtained through curve fitting of the finite element model, without the use of an empirical coefficient. Limitations of such a model are also discussed.

Nanotribological properties of ultra-thin carbon coatings for magnetic storage devices

2003 ◽  
Vol 174-175 ◽  
pp. 1126-1130 ◽  
Author(s):  
B. Jacoby ◽  
A. Wienss ◽  
R. Ohr ◽  
M. von Gradowski ◽  
H. Hilgers
Keyword(s):  
Magnetic Storage ◽  
Carbon Coatings ◽  
Storage Devices ◽  
Thin Carbon ◽  
Magnetic Storage Devices

scholarly journals Tribology and Mechanics of Magnetic Storage Devices

1991 ◽  
Vol 58 (2) ◽  
pp. 603-604 ◽  
Author(s):  
Bharat Bhushan ◽  
Y. W. Chung
Keyword(s):  
Magnetic Storage ◽  
Storage Devices ◽  
Magnetic Storage Devices

Nano-Imprinted Ultrahigh-Density Nanopore Arrays

2007 ◽  
Vol 124-126 ◽  
pp. 1269-1272 ◽  
Author(s):  
Kyung Hoon Kim ◽  
Min Jung Lee ◽  
Chul Kyu Kim ◽  
Eun Taek Woo ◽  
Mi Hee Kim ◽  
...  
Keyword(s):  
Anodic Alumina ◽  
Porous Anodic Alumina ◽  
Magnetic Storage ◽  
Display Devices ◽  
Storage Devices ◽  
Nanodot Arrays ◽  
Nanopore Arrays ◽  
Ultrahigh Density ◽  
Anodic Alumina Templates ◽  
Magnetic Storage Devices

Nano-structured polymer stamps were prepared from porous anodic alumina templates. Prepolymers were poured onto the highly ordered porous anodic alumina templates, and they were cured by UV-irradiation. Simple separation of the elastic stamp from the nanoporous aluminum oxide leads to well replicated nano-stamps. The nanopatterns on the stamp were transferred as ultrahigh-density nanopore arrays on various substrates which are potentially applicable to the fabrication of ultrahigh-density metallic or semiconductor nanodot arrays for magnetic storage devices or display devices.

Superparamagnetic regular nanopillar-like structures studied by grazing-incidence X-ray scattering: effect of vertical correlation

2014 ◽  
Vol 47 (3) ◽  
pp. 1065-1076 ◽  
Author(s):  
Amitesh Paul ◽  
Neelima Paul ◽  
Peter Müller-Buschbaum ◽  
Andreas Bauer ◽  
Peter Böni
Keyword(s):  
Three Dimensional ◽  
Perpendicular Magnetic Anisotropy ◽  
Grazing Incidence ◽  
Magnetic Storage ◽  
X Ray ◽  
Storage Devices ◽  
X Ray Scattering ◽  
Magnetic Storage Devices ◽  
Vertical Correlation ◽  
Ray Scattering

Grazing-incidence small-angle X-ray scattering is reported from nanoclusters in superparamagnetic (SPM) polycrystalline Co separated by Au. The self-organization of the Co nanoclusters is in the form of nanopillar-like structures with high perpendicular magnetic anisotropy. A distinct signature of regular near-neighbour ordering is observed, which is commonly observed in patterned nanostructures. The estimated cluster sizes corroborate with those estimated from their magnetic field response. Most significantly, the SPM limit for these clusters can be raised to above room temperature (∼325 K) with an increase in the vertical correlation of the nanopillars. The slow response time of these uniform nanomagnetic grains (with respect to a 10 kHz AC field) suggests their possible usage as potential magnetic storage devices in the form of three-dimensional nanopillars.

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