1. |
|
|
2. |
|
|
3. |
|
|
4. |
|
|
5. |
|
|
6. |
- Reichel, L., et al.
(author)
-
From soft to hard magnetic Fe-Co-B by spontaneous strain : a combined first principles and thin film study
- 2015
-
In: Journal of Physics. - : IOP Publishing. - 0953-8984 .- 1361-648X. ; 27:47
-
Journal article (peer-reviewed)abstract
- In order to convert the well-known Fe-Co-B alloy from a soft to a hard magnet, we propose tetragonal strain by interstitial boron. Density functional theory reveals that when B atoms occupy octahedral interstitial sites, the bcc Fe-Co lattice is strained spontaneously. Such highly distorted Fe-Co is predicted to reach a strong magnetocrystalline anisotropy which may compete with shape anisotropy. To probe this theoretical suggestion experimentally, epitaxial films are examined. A spontaneous strain up to 5% lattice distortion is obtained for B content up to 4 at%, which leads to uniaxial anisotropy constants exceeding 0.5 MJ m(-3). However, a further addition of B results in a partial amorphisation, which degrades both anisotropy and magnetisation.
|
|
7. |
|
|
8. |
|
|
9. |
|
|
10. |
|
|