Resonance-enhanced magnetic X-ray diffraction from a rare-earth alloy

Abstract

A single crystal of a r a r e 4 random-site alloy. Hoo.5Ero.5, bas been studied with x-ray diffraction. We have used the technique of resonance-enhanced scattering af the Ho and Er Lm absolption edges to study element-specific effecis in the temperature dependence of the magnetic SVUC~UIE below the N&l temperature. In the highest-temperature phase. a c-axis modulated suucture in which the Ho and Er moments take different tilt angles from the basal plane, mwurements at the hvo edges show identical satellite positions. The lowesttemperature phase, a conical spiral which locks to a s t " e with wavevector $=' below 20 K, is accompanied by a basal-plane lanice modulation that is related to the magnetic structure The modulation changes the symmehy of the crystal lattice; as a consequence we suggest that the magnetic st~clure locks to one with equidistant spin-slip dismmmensdons. In addition. WE fmd an unusual energy and polarization dependence in the satellite intensity in this phase that is not seen at higher temperatures. We present argumena to demonstrate that the unusual behaviour is not accounwl for by multiple-scattering events.

Incident photon energy dependence of the resonant x-ray magnetic scattering cross section of a samarium film

“…Several RXMS studies have taken advantage of the element selectivity to separate the contributions of different elements to the magnetism in compounds, 11 solid solutions, [12][13][14][15][16] or superlattices. 17 The present work aims at clarifying a less frequently addressed aspect of RXMS: the electronic shell selectivity.…”

Influence of perpendicular magnetic anisotropy on closure domains studied with x-ray resonant magnetic scattering

“…[11][12][13] The scattered intensity is proportional to the modulus square of the scattering amplitude times a phase factor, summed over the site r n of each resonant atom,…”

Resonant Magnetoelectric X-ray Scattering in GaFeO3: Observation of Ordering of Toroidal Moments

“…One can observe MEXS in materials with (anti-)ferroic ordering of , as the ordering of the spin or orbital has been sensitively observed by resonant X-ray scattering. 15,16) In this letter, we report the experimental observation of MEXS, in a polar ferrimagnet GaFeO 3 . 17) For the (020) and (040) Bragg reflections, we have observed a change in the scattering intensity near the Fe K pre-edge with reversal of the magnetization direction.…”