Ferromagnetism of FePt<sub>3sub> films induced by ion-beam irradiation
- 作者：Maat ; S. ; Kellock ; A.J. ; Weller ; D. ; Baglin ; J.E.E. ; Fullerton ; Eric E.
- 关键词：Patterned media ; Ion-beam irradiation ; Magnetic phase transition ; FePt3 ; Epitaxial growth ; Antiferromagnet
- 刊名：Journal of Magnetism and Magnetic Materials
- 出版年：2003
- 期刊代码：31_03048853
- 类别：ph
- 出版时间：September, 2003
- 卷：265
- 期：1
- 页码：1-6
- 文件大小：133 K
摘要
We demonstrate that chemically ordered FePt<sub>3sub> films can be altered from non-magnetic to ferromagnetic at room temperature by ion-beam irradiation. Both epitaxial and polycrystalline films were grown in the chemically ordered L1<sub>2sub> phase and are non-magnetic at room temperature. Upon irradiation with 700keV N<sup>+sup> ions at a dose of 1×10<sup>16sup> ions/cm<sup>2sup> the chemical order is destroyed and ferromagnetism is induced. The magnetism of the irradiated film is compared to an as-deposited chemically disordered ferromagnetic FePt<sub>3sub> film by hysteresis, torque, and moment vs. temperature curves. The present results share a common origin to the ferrimagnetic-to-non-magnetic transition observed in CrPt<sub>3sub> films and may have potential application for patterned ferromagnetic structures and for studying exchange biasing of laterally patterned ferromagnetic/antiferromagnetic structures.