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Thomas Gredig

Thomas Gredig

Assistant Professor, Condensed Matter Experiment

Ph.D. Physics, University of Minnesota, Twin Cities, 2002
M.S. Physics, University of Minnesota, Twin Cities, 1998

Location:
Office: Peterson Hall 1 (PH1), Room 203

California State University, Long Beach
Department of Physics Astronomy
1250 Bellflower Blvd.
Long Beach, CA 90840-3901

Phone: (562) 985-4922
Fax: (562) 985-7924
Email: tgredig@csulb.edu

Webpage :
http://www.csulb.edu/~tgredig/

Research Interests:
Condensed Matter Experiment, Thin Films, Nanomagnetism, Organic Semiconductors, Organic Field-Effect Transistors, Thin Film Crystallography, Exchange Bias
Organic Semiconductors - 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 (jeans, CD-R), gas sensors ("noses"), and photoconductors in copy machines. I am interested in understanding the structural properties, charge transport properties, magnetic properties of iron-phthalocyanine (FeC 32 N 8 H 16 ), and the design of novel gas sensors.

Exchange Bias - it refers to the interaction at the interface between a ferromagnet and an antiferromagnet of a thin film. Applications include magnetic read-heads of commercial hard disc drives. Through cooling such a bilayer in a magnetic field below the Néel temperature of the antiferromagnet, 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 made contributions to the understanding of the magnetization reversal process in exchange biased system, the training effect, and the local pinning field strength in Co/CoO bilayers.

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

Superconductivity - I am interested in understanding the effect of white light illumination on the properties of high-T c superconductors. In the past, I have compared oxygen deficient YBCO, LCMO, and bilayers of YBCO/LCMO and studied the effect of light on the superconductor transition temperature.

Last update: 4/10/08

Colloquium:

Proximity Effect in Superconductor/Ferromagnet Hybrid Systems,

J. Gu, CSU Long Beach.

Monday, November 23, 2009, 11am, PH2-110.

TRIUMF cyclotron in Vancouvers: site of the muSR experiments.


Welcome to our two new faculty:

Prashanth Jaikumar

 Prashanth Jaikumar: New faculty member at the department of Physics & Astronomy

Dr. Jaikumar is a nuclear astrophysicist who graduated from SUNY at Stony Brooks. His interests are in high-density matter and its relation to astrophysical phenomena in neutron stars.

Yohannes Abate

Yohannes Abate: new faculty member of the department of Physics and Astronomy

Dr. Abate is a condensed matter experimentalist, who graduated from the University of Iowa. His interests are in near-field microscopy and spectroscopy imaging in metals and semiconductors, plasmonics in nanoparticles and the physics of metamaterials.


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