Resonant magnetic scattering

X-ray resonant magnetic scattering measurements of the Ni and F signals have verified that the coupled CuNi and Py layers switch in tandem and that the switching of the pinned and free CuNi/Py layers are well separated J. W. Freeland (unpublished). 

To re-cast this in a form that is useful for the interpretation of data, and following Blume and Gibbs (1988), we express all of the vectors appearing in eq. (5) in terms of the orthonormal basis vectors Ui, Ui, and Uy defined in fig. 2. Thus, the amplitude for pure non-resonant magnetic scattering may be written in matrix form as... 

Fig. 3. Schematic, one-electron view of resonant magnetic scattering at the Ljjj absorption edge. The linearly polarised incident photon promotes a Ipj/j core electron into an empty state above the Fermi level. In the lanthanides there are 5d states available in the dipole approximation, and unfilled 4f states available through a quadrupole transition. Magnetic scattering results when the virtually excited electron decays, thereby filling the core hole and coherently emitting an elastically scattered photon.

It is clear from eq. (13) that for non-resonant magnetic scattering the different polarization states of the scattered beam contains information on the spin- and orbital-magnetization densities. To develop this further, and to derive useful expressions that may allow us to separate these components experimentally, requires a description of the polarization characteristics of the incident and scattered beams. The detailed analysis required to do this has been developed elsewhere (see, for example, Blume and Gibbs (1988) and references therein), and here we make use of only those steps that are needed for our example of the scattering from a helix. 

Skinner, J. L. and Trommsdorf, H. P. Proton transfer in benzoic acid crystals A chemical spin-boson problem. Theoretical analysis of nuclear magnetic resonance, neutron scattering, and optical experiments, J.Chem.Phys., 89 (1988), 897-907... 

Probing Metalloproteins Electronic absorption spectroscopy of copper proteins, 226, 1 electronic absorption spectroscopy of nonheme iron proteins, 226, 33 cobalt as probe and label of proteins, 226, 52 biochemical and spectroscopic probes of mercury(ii) coordination environments in proteins, 226, 71 low-temperature optical spectroscopy metalloprotein structure and dynamics, 226, 97 nanosecond transient absorption spectroscopy, 226, 119 nanosecond time-resolved absorption and polarization dichroism spectroscopies, 226, 147 real-time spectroscopic techniques for probing conformational dynamics of heme proteins, 226, 177 variable-temperature magnetic circular dichroism, 226, 199 linear dichroism, 226, 232 infrared spectroscopy, 226, 259 Fourier transform infrared spectroscopy, 226, 289 infrared circular dichroism, 226, 306 Raman and resonance Raman spectroscopy, 226, 319 protein structure from ultraviolet resonance Raman spectroscopy, 226, 374 single-crystal micro-Raman spectroscopy, 226, 397 nanosecond time-resolved resonance Raman spectroscopy, 226, 409 techniques for obtaining resonance Raman spectra of metalloproteins, 226, 431 Raman optical activity, 226, 470 surface-enhanced resonance Raman scattering, 226, 482 luminescence... 

Kubayashi, K., Kawata, H., and Mori, K. (1998). Site specification on normal and magnetic XANES of ferrimagnetic Fc304 by means of resonant magnetic Bragg scattering. J. Synch. Rad. 5, 972-4. 

Fig. 32. The integrated intensity of magnetic reflections of x-ray resonant exchange scattering measured for NdNi2BjC and SmNi2B2C. Dashed line and full line model calculations for a magnetic moment parallel to the tetragonal a-axis and c-axis, respectively (after Detlefs et al. 1997b).

C. A. Herb, I. D. Morrison and E. F. Grabowskl, In "Magnetic Resonance and Scattering In Surfactant Systems", L. Magld, ed., Plenum Press, to be published. 

Lovesey (1). We are interested in elastic scattering from spin-only systems where, for discussing magnetic scattering at low x at least, residual orbital effects introduced via spin-orbit coupling may be accounted for by a factor g/2 associated with the form factor, where the g-factor may be determined by magnetic resonance measurements. 

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