The domain structure was observed by naked eyes and microphotography after the crystal was etched with acid.

The experimental results indicate that the angle between twins, which forms line like domains, is always 0.

The microdomain-macrodomain transition of relaxor ferroelectrics was investigated by conven- tional method deeply by using amending local freezing glass-model.

A new stable ruler of jump frequency was raised during microdomain macrodomain transition.

Recent progress on observations of domain and domain switchings in ferroelectric ceramics;

In-situ Investigation of Domain Switching in PLZT Ferroelectric Ceramics during an Electric Fatigue Process and the Study of Electric Fatigue Mechanism in Ceramics;

The residual stress of the unloaded indentation crack can induce crack delayed propagation and domain switching in humid air and water.

Effect of film thickness on the magnetic domain of Co_(60)Fe_(20)B_(20) films by MFM;

We reported the investigation results of the magnetic domains in a Co_(50)Ni_(20)Ga_(30) shape memory alloy with applying a magnetic field by objective lens with the out-of-focus methods of Lorentz microscopy.

The range of magnetic domain size is 200～500 nm,and the magnetic domain length scale is much larger than the grain size.

It is very important in practice to study the susceptibility spectrum of the system consisting of the ferromagnetic particles with single domain.

Although large single domain YBCO superconducting bulk can be produced by using the top-seeded melt process, it takes a quite long period for the grain growth because of an extremely low growth rate of YBCO-123 phase.

The single domain YBCO superconducting disks up to 30mm in diameter have been prepared by the top seeded melting texture growth method in batch process.