Adding some new info, and bumping.
Copper, iron, aluminum and titanium are a few familiar examples of conventional metals that we interact with every day. In conventional metals, the
atoms that form the substance are arranged in a regular, repeating pattern called a crystal. This crystalline structure is not perfect, as it contains
numerous small defects. These imperfections actually serve to strengthen the metal. Of course, if the imperfections grow too large, the metal begins
to weaken, and eventually breaks.
"Amorphous" means "without shape". The atoms in an amorphous metal are arranged in a random, chaotic order. This lack of structure means that the
strength of small defects is present throughout the entire substance, creating an exceptionally strong material. With great strength comes exceptional
hardness, a property that is highly desirable for structural applications.
The objective of this project is to develop integrated magnetic sensors with thick layers (Ã… 20Âµm) of ferromagnetic amorphous metal, available in
tape form. The excellent magnetic characteristics of these amorphous metals should improve the present performance of magnetic sensors in the domain
of weak magnetic fields. The current work involves the development of a microtechnology process which allows the integration of this type of
ferromagnetic layer on silicon, the realization of some elementary structures to characterize these integrated layers and the development of
integrated magnetic sensors.
Project Description :
Currently, the ferromagnetic layers integrated in microsystems are deposited by standard technology processes like sputtering deposition, chemical
vapor deposition or electrochemical deposition. These processes are used in the microelectronic and microtechnology industries  . However, the
ferromagnetic characteristics obtained from these layers are considerably limited. There exists ferromagnetic amorphous metal ribbons manufactured by
injection and rapid cooling which demonstrate much better ferromagnetic characteristics . The use of such layers in integrated magnetic sensors
would greatly improve their performance. Furthermore, the choice of using amorphous metal ribbons as a material for integrated layers is justified by
the possibility of completly modifying their magnetic characteristics by heat treatment.
The first stages of the microtechnology process to integrate these ferromagnetic amorphous metal ribbons on silicon have been carried out. The process
of gluing and chemical etching of these layers have been studied and developed to realize some elementary toroidal or rectangular micro-structures
with three dimensional coils. Figure 1 shows the fabrication process of these structures
Still not sure how factfinder get credit for this thread.
[edit on 13-9-2005 by SpittinCobra]