139 research outputs found
Weakly Coupled Motion of Individual Layers in Ferromagnetic Resonance
We demonstrate a layer- and time-resolved measurement of ferromagnetic
resonance (FMR) in a Ni81Fe19 / Cu / Co93Zr7 trilayer structure. Time-resolved
x-ray magnetic circular dichroism has been developed in transmission, with
resonant field excitation at a FMR frequency of 2.3 GHz. Small-angle (to 0.2
degree), time-domain magnetization precession could be observed directly, and
resolved to individual layers through elemental contrast at Ni, Fe, and Co
edges. The phase sensitivity allowed direct measurement of relative phase lags
in the precession oscillations of individual elements and layers. A weak
ferromagnetic coupling, difficult to ascertain in conventional FMR
measurements, is revealed in the phase and amplitude response of individual
layers across resonance.Comment: 22 pages, 6 figures submitted to Physical Review
Large magnetic circular dichroism in resonant inelastic x-ray scattering at the Mn L-edge of Mn-Zn ferrite
We report resonant inelastic x-ray scattering (RIXS) excited by circularly
polarized x-rays on Mn-Zn ferrite at the Mn L2,3-resonances. We demonstrate
that crystal field excitations, as expected for localized systems, dominate the
RIXS spectra and thus their dichroic asymmetry cannot be interpreted in terms
of spin-resolved partial density of states, which has been the standard
approach for RIXS dichroism. We observe large dichroic RIXS at the L2-resonance
which we attribute to the absence of metallic core hole screening in the
insulating Mn-ferrite. On the other hand, reduced L3-RIXS dichroism is
interpreted as an effect of longer scattering time that enables spin-lattice
core hole relaxation via magnons and phonons occurring on a femtosecond time
scale.Comment: 7 pages, 2 figures,
http://link.aps.org/doi/10.1103/PhysRevB.74.17240
Local structure and site occupancy of Cd and Hg substitutions in CeTIn5 (T=Co, Rh, Ir)
The CeTIn5 superconductors (T=Co, Rh, or Ir) have generated great interest
due to their relatively Tc's, NFL behavior, and their proximity to AF order and
quantum critical points. In contrast to small changes with the T-species,
electron doping in CeT(In{1-x}Mx)5 with M=Sn and hole doping with Cd or Hg have
a dramatic effect on the electronic properties at very low concentrations. The
present work reports EXAFS measurements that address the substituent atom
distribution as a function of T, M, and x, near the superconducting phase.
Together with previous measurements for M=Sn, the proportion of the M atom
residing on the In(1) site, f{In(1)}, increases in the order M=Cd, Sn, and Hg,
ranging from about 40% to 70%, showing a strong preference for these
substituents to occupy the In(1) site (random=20%). In addition, f{In(1)}
ranges from 70% to 100% for M=Hg in the order T=Co, Rh, and Ir. These fractions
track the changes in the atomic radii of the various species, and help explain
the sharp dependence of Tc on substituting into the In site. However, it is
difficult to reconcile the small concentrations of M with the dramatic changes
in the ground state in the hole-doped materials with only an impurity
scattering model. These results therefore indicate that while such
substitutions have interesting local atomic structures with important
electronic and magnetic consequences, other local changes in the electronic and
magnetic structure are equally important in determining the bulk properties of
these materials.Comment: 10 pages, 7 figures, to appear in PR
Evidence for short range orbital order in paramagnetic insulating (Al,V)_2O_3
The local structure of (Al_0.06V_0.94)_2O_3 in the paramagnetic insulating
(PI) and antiferromagnetically ordered insulating (AFI) phase has been
investigated using hard and soft x-ray absorption techniques. It is shown that:
1) on a local scale, the symmetry of the vanadium sites in both the PI and the
AFI phase is the same; and 2) the vanadium 3d - oxygen 2p hybridization, as
gauged by the oxygen 1s absorption edge, is the same for both phases, but
distinctly different from the paramagnetic metallic phase of pure V_2O_3. These
findings can be understood in the context of a recently proposed model which
relates the long range monoclinic distortion of the antiferromagnetically
ordered state to orbital ordering, if orbital short range order in the PI phase
is assumed. The measured anisotropy of the x-ray absorption spectra is
discussed in relation to spin-polarized density functional calculations.Comment: 8 pages, 5 figure
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