By J.J.M. Franse, R. Gersdorf (auth.), H.P.J. Wijn (eds.)
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Extra resources for 3d, 4d and 5d Elements, Alloys and Compounds
37(4)pa was found for Fe [71 M 21. Table 1. Contributions in pn per atom to the atomic moments of Fe, Co, and Ni as obtained from two different analyses of room-temperature coherent polarized neutron scattering data: (i) form factor analysis assuming a magnetization distribution based on free-atom wave functions and (ii) Fourier analysis assuming a periodic localized and a constant average magnetization. The total magnetic moment is simply related to the forward magnetic scattering amplitude. 589(6).
104ergcm-3. May be less than the actual moment. 5 Magnetocrystalline anisotropy constants The anisotropy constants K,, K,, . . are defined for cubic lattices such as Fe and Ni by expressing the free energy of the crystal anisotropy per unit volume by E,=Ko+K,S+K2P+K3S2+K4SP+... g;+ c&; and P = ct2c12u2 1 2 3r where cli, clj, elkare the direction cosines of the angle between the magnetization vector and the crystallographic axes. For hexagonal lattices, such as Co, it is more convenient to use the definition where 4 is the angle between the magnetization and the c axis, and 0 is the angle in the basal plane.
H,,, is due to external influences such as applied fields. demagnetizing tields and Lorentz fields. This contribution is zero in cubic Fe, Co or Ni when there are no applied or demagnetizing fields, such as in domain walls for NMR experiments or in thin films magnetized in the plane of the films for Miissbauer effect measurements. Enhancement factor E An applied rf field causesthe electron moments to oscillate, the much smaller nuclear moments will then follow the motion of the electron moments.