Magnetic modulation

D. G. Rancoutt, H. H. A. Smith, and R. C. Thiel, Metastable compositionally and magnetically modulated state of Fe-Ni Invar and the associated super-mon nt dynamics from Mossbauer spectroscopy, J. Magn. Magn. Mat, 66 121 (1987). 

The essence of the DDIF method is to first establish a spin magnetization modulation that follows the spatial variation of the internal magnetic field within the individual pore. Such modulation is created by allowing spins to precess in the internal magnetic field. Then the diffusion-driven time-evolution (often decay) of such a modulation is monitored through a series of signal measurements at various evolution times tD. The time constant of this decay corresponds to the diffusion time of a molecule (or spin) across the pore and thus is a direct measure of the pore size. 

Anker JN, Kopelman R (2003) Magnetically modulated optical nanoprobes. Appl Phys Lett 82 1102-1104... 

The NOE is caused by dipole-dipole interaction (through-space) of two nuclear magnets, modulated by the tumbling of the molecule in solution. The NOE is an effect of mutual relaxation (or cross relaxation) of two nuclei. Mutual relaxation can occur in two ways zero-quantum (ZQ) relaxation involves a transition from the aft state (one spin up and one down) to the fta state (one spin down and one up) double-quantum (DQ) relaxation involves a transition from the ft ft state (both spins down) to the aa state (both spins up). These transitions are driven by a population difference out of... 

The 13C-NMR line-shape analysis at T < TN in (TMTTF)2Br has proved that the periodicity of the magnetic modulation is commensurate with the underlying lattice [52]. The spin lattice relaxation is activated in the SDW ground state since there exists a finite energy gap in the phason modes of this commensurate SDW phase (Fig. 8). 

The broken symmetry of the SDW ground state characterized by a magnetic modulation at wave vector Q in (TMTSF)2X, X = PF6, N03, and so on, is responsible for the activated behavior of the conductivity through the single-particle gap 2A. However, two kinds of collective excitations arise in the SDW condensate. They are, first, the magnon exci-... 

Hafeli, U.O. Magnetically modulated therapeutic systems. International Journal of Pharmaceutics 2004, 277, 19-24. 

Behrend CJ, Anker IN, McNaughtorr BH, Brasuel M, Philbert MA, Kopehnan R (2004) Metal-capped brownian and magnetically modulated optical nanoprobes (MOONs) micromechanics in chmnical and biological microenviromnents. J Phys Chem B 108 10408-10414... 

Most rare-earth superlattice samples studied to date have been grown along the (0001) direction, or c-axis (Flynn et al. 1989a, Falicov et al. 1990). While MBE growth is more straightforward in this orientation, it is also convenient to have the chemical and magnetic modulation in the same direction. 

Neutron diffraction data indicate magnetic modulated structures for the compounds. The magnetic structure of TbCoSn in the temperature range 1.4-5 K is described by the wave vector = (0,5,-j ). With an increase of the temperature, the wave vector changes at f k = 5 K to 2 = (0, 5,0). The R moments of other compounds form a square modulated magnetic structure along the V axis. The wave vector is k = (0,ky,0) with ky = j in DyCoSn, in HoCoSn and in ErCoSn. 

K L ko) Atomic absorption edge Atomic absorption edge Fourier transform of total atomic orbital angular momentum Magnetic modulation wave vector... 

Fig. 32. Temperature dependence of the magnetic modulation wave vector r in Tb. The open circle indicates the change in after quenching the sample from well into the paramagnetic state. Here lr.l.u. = 1.1036 A". ...

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