| AVS 55th International Symposium & Exhibition | |
| Magnetic Interfaces and Nanostructures | Thursday Sessions |
| Session MI-ThM |
| Session: | Magnetic Surfaces, Interfaces, Thin Films and Heterostructures |
| Presenter: | G.J. Mankey, University of Alabama |
| Authors: | G.J. Mankey, University of Alabama P. Mani, Western Digital D. Lott, GKSS Research Center F. Klose, Australian Nuclear Science and Technology Organisation H. Ambaye, Oak Ridge National Laboratory M. Wolff, Ruhr-University Bochum, Germany A. Schreyer, GKSS Research Center H.M. Christen, Oak Ridge National Laboratory B.C. Sales, Oak Ridge National Laboratory M.J. Walock, University of Alabama Z. Lu, University of Alabama P. LeClair, University of Alabama |
| Correspondent: | Click to Email |
Epitaxial films of Fe25Pt75 have a number of different magnetic phases as a function of temperature and chemical order. For example, chemically-ordered epitaxial films have two distinct antiferromagnetic phases at temperatures below ~160K, and exhibit paramagnetism above that temperature. In sharp contrast, chemically-disordered epitaxial films are ferromagnetic with a Curie temperature that is greater than 400K. Since both antiferromagnetic and ferromagnetic phases can exist in a partially-ordered film at temperatures below 160K, a magnetic exchange bias in the chemically-disordered ferromagnetic component can be induced through contact with the chemically-ordered antiferromagnetic component of the film. By varying the process conditions during growth, an alloy with the same composition throughout the film can exhibit a modulated magnetic structure. Using a combination of polarized neutron reflectivity and other magnetic characterization techniques, the observed exchange bias in such films is demonstrated to originate at the interfaces between the ferromagnetic and antiferromagnetic phases of Fe25Pt75.