The magnetocrystalline anisotropy constants k
1, k
2 and k
3 of iron and of alloys of 1.75, 2.46, 3.56 and 4.59 weight per cent silicon in iron have been measured in the temperature range 4.2-295 K. The measurements have been performed on spherical samples. The field dependence of the anisotropy constants Kn
(n = 1,2,...) determined from torque curves is described by
K
n
= kn
- μ0
M
n
H
i,M, n = 1, 2 ....
where Mn
are the direction dependent parts of the magnetization, and H
i,M is the component of the field inside the sample along the direction of magnetization. The magnetocrystalline anisotropy constants kn
are obtained by extrapolation to zero internal field. The anisotropy of magnetization is reported with values of M
1 and M
2.
The conduction-electron Zeeman splitting on the X-pocket holes in platinum has been investigated, with the use of the de Haasvan Alphen technique. The amplitude for the fundamental and second harmonic has been studied in the (100) and (110) planes. Two spin-splitting-zero contours on the second harmonic have been mapped out. A complete picture of the variation of the g, factor over the X pocket has been achieved, and its absolute value was found to range from 0.5 to 3.5.
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