Structural and magnetic properties of epitaxial Fe25Pt75


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 similar to 160 K and exhibit paramagnetism above that temperature. In sharp contrast, chemically disordered epitaxial films are ferromagnetic with a Curie temperature that is greater than 400 K. It is demonstrated that by varying the substrate temperature during growth, epitaxial films with varying degrees of chemical order can be produced and it is possible to produce an alloy with the same composition throughout the film with a modified magnetic structure. The authors used polarized neutron reflectivity to gauge the magnetism of a Fe25Pt75 sample produced with a periodic variation in the growth temperature and showed that the sample exhibits a reduced Curie temperature of approximately 300 K as compared to bulk Fe25Pt75.

antiferromagnetic materials, Curie temperature, epitaxial growth, ferromagnetic materials, iron alloys, magnetic epitaxial layers, magnetic hysteresis, magnetic structure, metallic epitaxial layers, paramagnetic materials, platinum alloys, reflectivity, EXCHANGE BIAS, ALLOYS, Materials Science, Coatings & Films, Physics, Applied, Materials Science, Physics
Lu, Z., Walock, M., LeClair, P., Mankey, G. (2009): Structural and Magnetic Properties of Epitaxial Fe₂₅Pt₇₅. Journal of Vacuum Science and Technology A, 27(4). DOI: