Patterned Magnetic Media Made by Self-Assembled Block-Copolymer Lithography

MRS Bulletin ◽  
2008 ◽  
Vol 33 (9) ◽  
pp. 838-845 ◽  
Author(s):  
C.A. Ross ◽  
J.Y. Cheng
Keyword(s):  
Magnetic Particles ◽  
The Self ◽  
Recording Media ◽  
Magnetic Media ◽  
Magnetic Recording Media ◽  
Large Area ◽  
Nanoscale Structures ◽  
Lithography Process ◽  
Self Assembled ◽  
Block Copolymer Lithography

AbstractPatterned magnetic recording media, in which data bits are stored in discrete single-domain magnetic particles, have been proposed for the next generation of recording media. To achieve high densities, features with periodicities on the order of 25 nm and below are required over large areas, which is a challenging task for any lithography process. Block copolymers (BCPs), which phase-separate into ordered periodic nanoscale structures, might provide a path to accomplish such patterning. In this article, we describe BCP lithography and show how the self-assembled patterns can be templated to make large-area arrays of nanoscale structures with long-range order.

Preparation and Properties of Well-Defined Magnetic Particles

MRS Bulletin ◽  
1989 ◽  
Vol 14 (12) ◽  
pp. 35-40 ◽  
Author(s):  
Masataka Ozaki
Keyword(s):  
Drug Delivery Systems ◽  
Magnetic Particles ◽  
Magnetic Interactions ◽  
Recording Media ◽  
Magnetic Media ◽  
Magnetic Recording Media ◽  
Scientific Interest ◽  
Small Particles ◽  
Magnetic Dispersions ◽  
Geomagnetic Fields

Magnetic particles are important not only in the technology, but also in the function of some biosystems. In addition, they are of great scientific interest in developing a better understanding of magnetic phenomena. Ever since magnetic recording media were first prepared, extensive efforts have been made to produce improved magnetic dispersions. The particle s for magnetic media must be of single domain, high saturation magnetization, and proper coercive force. However, the magnetic interactions between such particles are very strong, and stable dispersions are difficult to obtain. Originally, their use was limited to audio tapes, but presently they are employed in a variety of applications. Thus, small particles of different magnetic properties are constituents of magnetic fluids.In 1975, magnetic particles were identified in the bodies of some bacteria, which can navigate along geomagnetic fields. It is also believed that certain animais have the ability to detect a magnetic field due to the presence of magnetic particles in their cells.Techniques are being developed to introduce new functions to materials by incorporating magnetic particles. For example, magnetic particles that are encapsulated by nonmagnetic compounds (e.g. polymers) or particles are used for binding and separating enzymes from reactant mixtures. Efforts are under way to use magnetic particles in drug delivery Systems and for diagnosis.

Block copolymer self-assembly assisted fabrication of laterally organized- and stacked- nanoarrays

2021 ◽  
Author(s):  
Vignesh Suresh ◽  
Ah Bian Chew ◽  
Christina Yuan Ling Tan ◽  
Hui Ru Tan
Keyword(s):  
Block Copolymer ◽  
Self Assembly ◽  
The Self ◽  
Functional Surfaces ◽  
Self Assembled ◽  
Block Copolymer Lithography ◽  
Unique Surface ◽  
Copolymer Lithography

Abstract Block copolymer (BCP) self-assembly processes are often seen as reliable techniques for advanced nanopatterning to achieve functional surfaces and create templates for nanofabrication. By taking advantage of the tunability in pitch, diameter and feature-to-feature separation of the self-assembled BCP features, complex, laterally organized- and stacked- multicomponent nanoarrays comprising of gold and polymer have been fabricated. The approaches not only demonstrate nanopatterning of up to two levels of hierarchy but also investigate how a variation in the feature-to-feature gap at the first hierarchy affects the self-assembly of polymer features at the second. Such BCP self-assembly enabled multicomponent nanoarray configurations are rarely achieved by other nanofabrication approaches and are particularly promising for pushing the boundaries of block copolymer lithography and in creating unique surface architectures and complex morphologies at the nanoscale.

scholarly journals Self-assembled nano-size FePt islands for ultra-high density magnetic recording media

2010 ◽  
Vol 518 (8) ◽  
pp. 2167-2170 ◽  
Author(s):  
G.P. Lin ◽  
P.C. Kuo ◽  
K.T. Huang ◽  
C.L. Shen ◽  
T.L. Tsai ◽  
...  
Keyword(s):  
Magnetic Recording ◽  
High Density ◽  
Recording Media ◽  
Magnetic Recording Media ◽  
Self Assembled ◽  
High Density Magnetic Recording ◽  
Nano Size

Fabrication and Properties of Self-Assembled Nanosized Magnetic Particles

2001 ◽  
Vol 707 ◽  
Author(s):  
G. Salazar-Alvarez ◽  
M. Mikhailova ◽  
M. Toprak ◽  
Y. Zhang ◽  
M. Muhammed
Keyword(s):  
Self Assembly ◽  
Magnetic Particles ◽  
Average Particle Size ◽  
The Self ◽  
Average Particle ◽  
Shell Nanoparticles ◽  
Force Microscopy ◽  
Transmission Electron ◽  
Self Assembled ◽  
Core Shell Nanoparticles

ABSTRACTThe synthesis and characterisation of gold-coated cobalt nanoparticles, as well as their chemically- and magnetically-induced self-organisation have been studied. Metallic core-shell nanoparticles were prepared using two different experimental techniques: bulk reductive precipitation, with average particles size ∼15 nm, and microemulsion confining method, with average particle size of ∼6 nm. The self-assembly of prepared nanoparticles on flat substrates was achieved by derivatising the substrate and particle surfaces with bifunctional organic molecules that attaches to both particles and substrates. Examination of the self-assembled systems was carried out by a number of characterisation techniques including transmission electron microscopy (TEM), UV-visible spectrophotometry (UV-VIS), and atomic force microscopy (AFM).

Self-Assembled Ferrimagnet−Polymer Composites for Magnetic Recording Media

Nano Letters ◽  
2010 ◽  
Vol 10 (8) ◽  
pp. 3216-3221 ◽  
Author(s):  
Qiu Dai ◽  
David Berman ◽  
Kumar Virwani ◽  
Jane Frommer ◽  
Pierre-Olivier Jubert ◽  
...  
Keyword(s):  
Polymer Composites ◽  
Magnetic Recording ◽  
Recording Media ◽  
Magnetic Recording Media ◽  
Self Assembled

scholarly journals Full parameter space exploration of microphase separation of block copolymer brushes within a single simulation framework

2021 ◽  
Author(s):  
Tae-Yi Kim ◽  
Ga Ryang Kang ◽  
Myungwoong Kim ◽  
Vikram Thapar ◽  
Su-Mi Hur
Keyword(s):  
Block Copolymer ◽  
Parameter Space ◽  
Special Interest ◽  
Microphase Separation ◽  
Space Exploration ◽  
The Self ◽  
Simulation Framework ◽  
Nanoscale Structures ◽  
Self Assembled ◽  
Copolymer Brushes

Block copolymer brushes where chains are grafted onto the substrate have been of special interest due to their capability to form various self-assembled nanoscale structures. The self-assembled structures depend on...

Fabrication and Properties of Self-Assembled Nanosized Magnetic Particles

2001 ◽  
Vol 704 ◽  
Author(s):  
G. Salazar-Alvarez ◽  
M. Mikhailova ◽  
M. Toprak ◽  
Y. Zhang ◽  
M. Muhammed
Keyword(s):  
Self Assembly ◽  
Magnetic Particles ◽  
Average Particle Size ◽  
The Self ◽  
Average Particle ◽  
Shell Nanoparticles ◽  
Force Microscopy ◽  
Transmission Electron ◽  
Self Assembled ◽  
Core Shell Nanoparticles

AbstractThe synthesis and characterisation of gold-coated cobalt nanoparticles, as well as their chemically- and magnetically-induced self-organisation have been studied. Metallic core-shell nanoparticles were prepared using two different experimental techniques: bulk reductive precipitation, with average particles size ∼15 nm, and microemulsion confining method, with average particle size of ∼6 nm. The self-assembly of prepared nanoparticles on flat substrates was achieved by derivatising the substrate and particle surfaces with bifunctional organic molecules that attaches to both particles and substrates.Examination of the self-assembled systems was carried out by a number of characterisation techniques including transmission electron microscopy (TEM), UV-visible spectrophotometry (UV-VIS), and atomic force microscopy (AFM).

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