| Autor: |
O’Shea, M. J., Jiang, H., Perera, P., Hamdeh, H. H. |
| Předmět: |
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| Zdroj: |
Journal of Applied Physics; 5/1/2000, Vol. 87 Issue 9, p6137, 3p |
| Abstrakt: |
Thin amorphous Dy[sub 50]Fe[sub 50]/A layers are prepared by sputtering to understand the influence of the spacer layer A on magnetic properties in the DyFe thickness regime where size effects are also important. The spacer layer A in this work is either Ti or Ca and we compare to our earlier work involving a spacer layer of Mo. The Dy[sub 50]Fe[sub 50] layer is amorphous and Mo¨ssbauer spectroscopy indicates that two types of Fe site are present. Finite size effects manifest themselves below a size of 10 nm in a reduction of magnetic ordering temperature T[sub C] and coercivity H[sub C]. For equal values of d, the reduction of T[sub C] and H[sub C] is larger for the system with a Ti or Mo spacer layer as compared to the Ca spacer layer. We argue that both size and the structure of the interface are important in lowering H[sub C] and T[sub C]. The temperature dependence of coercivity is also studied and suggests that magnetic reversal via domain wall movement occurs in our thinnest films. © 2000 American Institute of Physics. [ABSTRACT FROM AUTHOR] |
| Databáze: |
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