Fabrication and magnetic properties of nanopatterned FePt media
- Authors
- Tang, Yun-Jun; Aubuchon, Joseph F; Chen, Lihan; Jin, Sungho; Kim, Ji-won; Kim, Young-ho; Yoon, Chong Seung
- Issue Date
- Apr-2006
- Publisher
- AMER INST PHYSICS
- Citation
- JOURNAL OF APPLIED PHYSICS, v.99, no.8
- Indexed
- SCIE
SCOPUS
- Journal Title
- JOURNAL OF APPLIED PHYSICS
- Volume
- 99
- Number
- 8
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/181636
- DOI
- 10.1063/1.2166599
- ISSN
- 0021-8979
- Abstract
- A method for fabricating nanopatterned media has been investigated. A monolayer of regularly distributed Ni nanoparticles of uniform diameter (similar to 5 nm) fabricated on the surface of a polyimide-coated Si substrate using metal film-polyamic acid interactions was utilized as a protruding template to deposit an array of FePt phase. A FePt film (5 nm thick) was sputtered onto this template with or without an underlayer of either 5-nm-thick MgO or CoO and analyzed before and after annealing. It was observed that while the FePt films sputtered on flat Si substrates with underlayers exhibited low H-c of only about 1 kOe after the L1(0) conversion, the FePt samples deposited onto protruding Ni nanoparticle templates showed a significant increase in H-c to similar to 8.1 kOe. The FePt sample with CoO underlayer exhibited a possibly strong perpendicular magnetic anisotropy. The intergranular exchange coupling of the samples was also investigated by using Delta M method.
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