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.

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

Sputter Deposition of Self-Organized Nanoclusters Through Porous Anodic Alumina Templates

2007 ◽  
Vol 7 (2) ◽  
pp. 641-646 ◽  
Author(s):  
Smita Gohil ◽  
Ramesh Chandra ◽  
Bhagyashree Chalke ◽  
Sangita Bose ◽  
Pushan Ayyub
Keyword(s):  
Ambient Pressure ◽  
Anodic Alumina ◽  
Porous Anodic Alumina ◽  
Average Pore ◽  
Self Organized ◽  
Atomic Force ◽  
Sputter Deposited ◽  
Anodic Alumina Templates ◽  
Hexagonally Ordered ◽  
Ordered Porous

Silver nanoparticles were sputter deposited through self organized hexagonally ordered porous anodic alumina templates that were fabricated using a two-step anodization process. The average pore diameter of the template was 90 nm and the interpore spacing was 120 nm. Atomic force microscope studies of the sputter-deposited silver nanoparticle array on a Si substrate indicate an approximate replication of the porous anodic alumina mask. The nature of the deposition depends strongly on the process parameters such as sputtering voltage, ambient pressure and substrate temperature. We report a detailed study of the sputtering conditions that lead to an optimal deposition through the template.

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