By J.J.M. Franse, R. Gersdorf (auth.), H.P.J. Wijn (eds.)
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Landalt-Bbmstein New Series lll/l9a Stearns [Ref. p. l FL UT! 10-3 1 4 2 b Fig. 2a. Temperature dependence of the inverse paramagnetic mass susceptibility of fee Co [56N 11. r-r, 6 Ni r, 0 cm3 d 12 10 I 8 -i! ^^^ 10 K 20 Fig. 2b. 2K, in an applied magnetic field H npp,= 181Oe. Straight lines represent tits to the data of the form xg = K( T- T,)” for various n [65 C 21. c 8 - 1100 1200 1300 1LOO 1500K 1600 I- Fig. 3a. Tempcraturc dcpcndcncc of the inverse paramagnetic mass susceptibility of Ni. Samples 1 and 2: [63 A2],3: [I I W I], 4: [38 S 2], 5: [44 F I].
G,,, denotes the reciprocal lattice vector for the hkl reflection and V is the volume of the unit cell. F,,,, obtained from the Bragg scattering amplitude for the hkl reflection, coincides, for wavevectors Q=G,,,, with the nonnormalized elastic magnetic form factor of the unit cell, F(Q) = 5 d3xm(x) eiQ’*. F(Q) equals the Fourier transform M(Q) of the magnetization of the unit cell, see Fig. lb. Stearns Ref. p. 7 Fe, Co, Ni: Form factors, magnetic moment distribution The magnetic moment densities measuredby neutron scattering are the net spin polarizations in the direction of the applied field, averaged over the resolution function related to the finite number of Bragg reflexions being taken into account in evaluating the Fourier sum.
Herbis the field contribution from the dipolar interactions from any unquenched orbital momentum on the central atom. 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.