ABSTRACT
It is well known that the discovery of a new material opens the
way to new fields in science and in technological applications.
The discovery of graphene is surely not an exception. From
around 1980 many discoveries of new materials have been
reported: quasi-crystals with five-rotational symmetry, high-Curie-
temperature superconductivity in cuprates such as (La-Sr)2CoO4,
superconductors made of Fe and As elements, magnetic multilayers
that resulted in the discovery of giant magnetoresistance (GMR)
and tunnel magnetoresistance (TMR), magnetic semiconductors
such as (Ga-Mn)As, C60, carbon nanotubes, and the new permanent
magnet Nd2Fe14B called Neomax. The establishment of fabrication
techniques of Ga-N should also be highly approved.
