International
Tables for
Crystallography
Volume C
Mathematical, physical and chemical tables
Edited by E. Prince

© International Union of Crystallography 2006
International Tables for Crystallography (2006). Vol. C. ch. 4.4, p. 441

Table 4.4.2.5 

I. S. Andersona and O. Schärpff

Table 4.4.2.5 | top | pdf |
Scattering-length densities for some typical materials used for polarizing multilayers

Magnetic layer N(b + p) (10−6 Å−2) N(b − p) (10−6 Å−2) Nb (10−6 Å−2) Nonmagnetic layer
Fe 13.04 3.08 3.64 Ge
3.50 Ag
3.02 W
2.08 Si
2.08 Al
Fe:Co (50:50) 10.98 −0.52 −0.27 V
−1.95 Ti
Ni 10.86 7.94    
Fe:Co:V (49:49:2) 10.75 −0.63 −0.27 V
−1.95 Ti
Fe:Co:V (50:48:2) 10.66 −0.64 −0.27 V
−1.95 Ti
Fe:Ni (50:50) 10.53 6.65    
Co 6.65 −2.00 −1.95 Ti
Fe:Co:V (52:38:10) 6.27 2.12 2.08 Si
2.08 Al

For the non-magnetic layer we have only listed the simple elements that give a close match to the N(b − p) value of the corresponding magnetic layer. In practice excellent matching can be achieved by using alloys (e.g. TixZry alloys allow Nb values between −1.95 and 3.03 × 10−6 Å−2 to be selected) or reactive sputtering (e.g. TiNx)