Abstract
The effect of a Ti underlayer on the magnetic properties of Co-Cr films was investigated. Although the existence of a Ti underlayer does not improve the crystallographic orientation of Co-Cr films, it increases their perpendicular coercive force. In order to clarify the cause of this phenomenon, the film thickness dependence of the magnetic properties of Co-Cr films was investigated. As a result, it was revealed that the coercive force of a Co-Cr fails deposited directly on a polyimide substrate decreases drastically when it becomes thinner than 50nm, whereas in the case of Co-Cr film on a Ti underlayer, a high coercive force is maintained even when it becomes as thin as 20nm. According to our observation of cross-sectional structures, the Co-Cr film with the Ti underlayer has a distinct uniform columnar structure, whereas the Co-Cr film without the Ti underlayer has a 50nm thick initial growth layer which has no clear structure. Moreover, according to the measurements of temperature-dependence of magneticproperties and observations of segregated microstructures in Co-Cr films, it was found that the improvement of magneticproperties by the insertion of the Ti underlayer was mainly due to the improvement of shape anisotropy which was caused by forming a distinctly segregated microstructure.
| Original language | English |
|---|---|
| Pages (from-to) | 2353-2355 |
| Number of pages | 3 |
| Journal | IEEE Transactions on Magnetics |
| Volume | 24 |
| Issue number | 6 |
| DOIs | |
| Publication status | Published - 1988 Nov |
| Externally published | Yes |
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Electrical and Electronic Engineering