Abstract
L10 FePt films composed of separated island-like particles with a size distribution were epitaxially deposited on MgO (0 0 1) substrate at 780 °C. The most probable size of particle at nominal thickness t N=25 nm is 10 times as big as that at tN=5 nm.Most of the as-deposited particles are single-domain at tN=5 nm, and the majority are multi-domain at tN=25 nm.Out-of-plane coercivity is ∼50 kOe at tN=25 nm.A peculiar asymmetric initial magnetization process against the direction of applied perpendicular field was imaged by an in-field magnetic force microscope (MFM). At +6 kOe, a few particles were kept as multi-domain structures as long as the majority became saturated; however, they became saturated only at -1 kOe. High coercivity is attributed to a wide distribution of nucleation field HN ranging from 20 to 70 kOe.
Original language | English |
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Pages (from-to) | 219-223 |
Number of pages | 5 |
Journal | Journal of Magnetism and Magnetic Materials |
Volume | 287 |
Issue number | SPEC. ISS. |
DOIs | |
Publication status | Published - 2005 Feb |
Keywords
- Coercivity
- Domain structure
- L1 FePt film
- Magnetic force microscopy
- Magnetization process
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics