Title:
Modification of magnetic properties in micro-nanostructured materials and applications

Speaker:
Pham Duc Thang
VNU University of Engineering and Technology,
144 Xuan Thuy, Cau Giay, Hanoi, Vietnam

Abstract:
Functional metal oxide materials are of particular attraction as exhibiting a variety of interesting physical properties, for examples conducting/non-conducting behaviours at different ranges of frequency, tunnelling of the magnetization at nano-scaled structures as well as their applications in a wide variety of emerging technological fields such as microelectronics, ceramics, catalysts, energy conversion and storage. etc.

Developing new properties for well-known micro and nano-based materials is always an interesting challenging area. In this talk, some micro-nanostructured ferromagnetic and ferroelectric bulk and films, based on oxides consisting of magnetic or non-magnetic elements, have been prepared by different chemical and physical techniques. By varying processing parameters such as annealing/substrate temperature, ambient pressure, starting composition as well as by doping some metallic elements, one can be able to tune crystallographic structure, microstructure and specially magnetic properties of the materials. The role of grain size, the exchange of ion valences and their crystallographic sites, the stress-induced effect, etc. on the change in magnetic properties will be discussed in details. Some applications related to the studied materials will be also presented.