Physics

I am an experimental condensed matter physicist. My research interests are nanotechnology, magnetism in thin films, magnetic vortices, exchange bias, superconductivity, and organic semiconductors.

Links

Publications
Dissertation

exchange bias

Here it refers to the interaction at the interface between a ferromagnet and an antiferromagnet. Through cooling such a bilayer in a magnetic field below the Neel temperature of the antiferromagnet (Curie temperature is assumed to be larger than the Neel temperature), a magnetic unidirectional anisotropy is induced. This anisotropy pins the ferromagnet in the cooling field direction, and breaks the symmetry of the magnetic hysteresis loop. I have studied the system of Co/CoO and you can read more in my dissertation with the title "Exchange Bias investigated with Anisotropic Magnetoresistance (AMR)". I have made contributions to the understanding of the magnetization reversal process in exchange biased system, the training effect, and the local pinning field strength.

superconductivity

We are interested in understanding the effect of white light illumination on the properties of high-Tc superconductors, particularly, we have compared oxygen deficient YBCO, LCMO, and bilayers of YBCO/LCMO.

magnetic vortices

Magnetic vortices can be nanodots larger than a single domain, but not large enough for a domain wall to form. We have made magnetic Co vortices that typically measure 400 to 500nm in diameter. We are interested in understanding the interactions of magnetic vortices with a superconductor.

organic semiconductor

Phthalocyanines belong to a diverse family of organic semiconductors. At the center of such a molecule is usually a metal ion, such as Cu, Fe, Co, or Zn, for example. Phthalocyanines are currently used as dyes, gas sensors, and photoconductors. We are interested in understanding the structural properties, and charge transport properties, as well as the magnetic properties of iron(II)-phthalocyanine.