Giant Magnetoresistance Behavior of an Iron/Carbonized Polyurethane Nanocomposite
Abstract
This letter describes the magnetoresistance (MR) behavior of the heat-treated polyurethane composites reinforced with iron nanoparticles. The flexible nanocomposites were fabricated by the surface-initiated-polymerization method. The uniformly distributed nanoparticles within the polymer matrix, well characterized by field emission scanning electron microscopy, favor a continuous carbon matrix formation, rendering the transition from insulating to conductive composites. The coercive forces reflect strong particle loading and matrix dependent magnetic properties. By simply annealing in a reducing environment, the obtained nanocomposites possess a MR of 7.3 % at room temperature and 14 % at 130 K occurring at a field of 90 kOe.
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 01, 2006
- Accession Number
- ADA507214
Entities
People
- Amar B. Karki
- David P. Young
- H. T. Hahn
- Monica Moldovan
- Sung Park
- Suying Wei
- Zhanhu Guo
Organizations
- University of California, Los Angeles