Diffusion in (00▪2)-oriented polycrystalline Co90Fe10/Ru multi-layers was measured and quantified by means of X-ray reflectivity at 450 to 540C. The bulk diffusion could be described by:
D (m2/s) = 6.43 x 10-9 exp[-4.95(eV)/kT]
No grain boundary diffusion was detected in the large-grain structure dominated by high-symmetry grain boundaries within the above temperature interval. It was noted that, for a spin-valve structure that contained Co90Fe10/Ru interfaces, it was clear that – in the absence of grain boundary diffusion and a very high activation energy for bulk diffusion - degradation would first take place at another interface, or via another phenomenon.
E.B.Svedberg, K.J.Howard, M.C.Bønsager, B.B.Pant, A.G.Roy, D.E.Laughlin: Journal of Applied Physics, 2003, 94[2], 993-1000
Table 70
Diffusivity of 57Co in CoAl
Al(at%) | Temperature(K) | D(m2/s) |
42 | 1630 | 1.48 x 10-14 |
42 | 1600 | 8.32 x 10-15 |
42 | 1570 | 4.49 x 10-15 |
42 | 1510 | 1.76 x 10-15 |
42 | 1476 | 2.80 x 10-16 |
42 | 1450 | 1.15 x 10-16 |
42 | 1380 | 5.91 x 10-17 |
42 | 1350 | 2.00 x 10-17 |
42 | 1317 | 1.42 x 10-17 |
42 | 1273 | 3.28 x 10-18 |
42 | 1250 | 2.30 x 10-18 |
46 | 1540 | 5.47 x 10-16 |
46 | 1510 | 3.95 x 10-16 |
46 | 1480 | 1.73 x 10-16 |
46 | 1430 | 9.43 x 10-17 |
46 | 1410 | 3.46 x 10-17 |
continued
Table 70 (continued)
Diffusivity of 57Co in CoAl
Al(at%) | Temperature(K) | D(m2/s) |
46 | 1380 | 1.33 x 10-17 |
50 | 1630 | 3.35 x 10-15 |
50 | 1600 | 2.16 x 10-15 |
50 | 1570 | 4.90 x 10-16 |
50 | 1540 | 3.26 x 10-16 |
50 | 1510 | 1.99 x 10-16 |
50 | 1480 | 7.80 x 10-17 |
50 | 1450 | 6.50 x 10-17 |
50 | 1380 | 8.20 x 10-18 |
50 | 1350 | 2.66 x 10-18 |
52 | 1600 | 7.19 x 10-16 |
52 | 1540 | 3.85 x 10-16 |
52 | 1480 | 6.64 x 10-17 |
52 | 1450 | 6.45 x 10-17 |