1. The Center for Materials for Information Technology, The University of Alabama, Tuscaloosa, AL 35487, USA
2. Materials Development Center, TDK Corporation, Narita, Chiba 286-0805, Japan
3. Department of Physics and Astronomy, The University of Alabama, Tuscaloosa, AL 35487, USA
4. Department of Metallurgical and Materials Engineering, The University of Alabama, Tuscaloosa, AL 35487, USA
5. Department of Electrical and Computer Engineering, The University of Alabama, Tuscaloosa, AL 35487, USA