By J.J.M. Franse, R. Gersdorf (auth.), H.P.J. Wijn (eds.)
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Extra info for 3d, 4d and 5d Elements, Alloys and Compounds
Q) is a fluctuation term which has been extensively discussedby Moriya et al. [73 M 3, 79 M 21. In general the itinerant part of the magnetic moment is more polarizable in an applied field than the local part so that the moment obtained by applying eq. (I) in the paramagnetic region results in the paramagnetic moment being larger than the moment obtained from magnetization measurementsin the ferromagnetic region. The susceptibility has been determined by magnetization measurements and neutron scattering, the magnetization measurementscorresponding to Q =O.
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. The measurementsare usually made on single-crystal spheresin a field large enough to remove the domain walls (called technical saturation).
L. All 26 crystal reflections out to the 622 reflection corresponding to a maximum sin0/l. 157 A- ’ have been studied. The solid and dashed curves are the calculated spherical free-atom form factors for the two electron configurations 3ds and 3dh4s2, rcspcctivcly, [6l W 23. 0 0 (reciprocal lattice units I- Fig. lb. Fourier transform of the magnetic moment density as measured by inelastic neutron scattering from phonons along different crystallographic directions in Fe4 at% Si. The smooth curves arc interpolations of the expcrimcntal elastic form factors.
3d, 4d and 5d Elements, Alloys and Compounds by J.J.M. Franse, R. Gersdorf (auth.), H.P.J. Wijn (eds.)