Nanotechnology advances and applications in information storage

Abstract

A brief review of some applications of nanotechnology to information storage is given with the focus on self-assembled nanoporous alumina templates for patterned media.Ordered nanoporous alumina templates were fabricated by self-assembly technology. A two-step anodization process was also carried out to obtain templates with pores perpendicular to the substrate without removing the aluminum and barrier layer. Polycrystalline structure was observed with a grain size of about 2 lm in which the pores were almost perfect hexagonally ordered. The pore arrays exhibit different orientation along the boundaries of neighboring grains. Nanopatterning implemented by electron-beam lithography demonstrates the ability to write pores forming concentric circles with pore diameter as small as 50 nm.

Novel structure formation at the bottom surface of porous anodic alumina fabricated by single step anodization process

“…In contrast, we did not observe such kind of disadvantages in the bottom side of the PAA film as shown in the HRSTEM image. Many researchers (Masuda and Fukuda, 1995; Masuda et al, 1997b;Juang and Bogy, 2005;Zhang et al, 1998) reported that growth rate of pores, pore density, pore ordering and pore clarity increase with increase in anodizing time. It has also been reported that there is no effect on growth rate of pores and pore density decrease with increase in anodizing time after critical anodizing time (Feiyue et al, 1998).…”

In vitro and in vivo evaluations of three‐dimensional hydroxyapatite/silk fibroin nanocomposite scaffolds

“…Tissue engineering has emerged as a potential alternative to tissue transplantations and aims to develop biological substitutes to repair damaged tissues and restore their functionality using a triad of cells (usually stem cells), biomaterial scaffolds, and soluble factors . Every year, world's population is remarkably increasing.…”

Highly Ordered Anodic Porous Alumina Formation by Self‐Organized Anodizing

“…Currently, there is a great demand in the microelectronics industry for the ideal magnetic medium consisting of a 2D array of ordered islands with nanometer dimensions. Patterned magnetic media fabricated directly by various lithography techniques and regular arrays of magnetic dots and wires obtained by a template synthesis approach have been one of the more widely discussed possibilities for useful devices to extend the density of recording and information storage [21][22][23][24][25][26]. Magnetic structures have been also used for the fabrication of a nanoscale single domain magnetoresistive bridge sensor, and for a new ultra-high-resolution tip of the magnetic force microscope [27].…”