Biomedical Engineering Reference
In-Depth Information
2
Magnetic properties of ceramic
nanocomposites
D.D.MAJUMDER,D.D.MAJUMDERand
S. KARAN, Institute of Cybernetic Systems and Information
Technology, Kolkata, India
Abstract: Nanocomposites are often found in nature, as a multiphase
solid material where one of the phases has one, two or three dimensions
of less than 100 nm, or structures having nano-scale repeat distances
between the different phases that make up the material. In this chapter
the magnetic properties of ceramic nanocomposites are presented, along
with structures which differ markedly from that of the component
materials. It is emphasized that, in the case of nanocomposites, where the
main part of the volume is occupied by ceramics (i.e. a chemical
compound from the group of oxides, nitrides, borides or silicates, among
others), further systematic study will be necessary to improve their
optical, electrical and magnetic properties, as well as their tri-biological,
corrosion resistance and other protective properties.
Key words: nanocomposites, nano fabricated films, electron tunnelling,
magnetic data storage, colossal magnetoresistance, double quantum dots
(DQD), soft magnetic materials.
2.1
Introduction
Molecular nanotechnology [1-3] involves developing structures at the
molecular scale, designed and built atom by atom. The purpose of this
chapter is to provide a technical overview of magnetic nanocomposites [4-
26] and to detail current trends in their development and application. The
science and technology relating to nanostructures is an interdisciplinary area
of research and development that has been growing in past decades. Among
these nanoscale materials are nanocomposites. These often have properties
