| Autor: |
Takao Suzuki, Jiangwei Cao, Nguyen T. Nam, Yoshihiko Hirotsu, Hnin Yu Yu Ko, Nguyen N. Phuoc |
| Rok vydání: |
2008 |
| Předmět: |
|
| Zdroj: |
Journal of Magnetism and Magnetic Materials. 320:3120-3123 |
| ISSN: |
0304-8853 |
| DOI: |
10.1016/j.jmmm.2008.08.089 |
| Popis: |
The various compositions of FePt and FeRh nanoparticles, and their composite particles have been fabricated by the solution-phase chemical method and their magnetic properties characterized. High-resolution transmission electron microscopic observations indicate that mono-dispersed FeRh and FePt/FeRh nanoparticles are fabricated with the average size of 3–5 nm. However, larger size particles are distributed in the annealed state. From X-ray diffraction results, the as-deposited FeRh nanoparticles reveal a chemically disordered fcc structure which can be transformed into CsCl-type structure through thermal annealing. Similarly, the annealed FePt nanoparticles show the L10-phase fct structure although the fcc structure is apparent in the as-deposited state. It is also found that the first time in the exchange bias effect in the composite of ferromagnetic (FePt) and anti-ferromagnetic (FeRh) nanoparticles; result in a shift of the hysteresis loop after field cooling process. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect