X-ray resonant magnetic scattering by Fe/Cr superlattices (original) (raw)
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X-ray resonant magnetic scattering on noncollinearly coupled Fe/Cr superlattices
2005
We have studied in detail the structural and magnetic properties of an antiferromagnetically (AF) coupled Cr(25.6 Å )/Fe(15.2 Å ) superlattice by soft X-ray resonant magnetic scattering. Using the resonance condition close to the Fe L 3 edge, magnetic peaks are observed at the half-orders Bragg peaks positions. The magnetic hysteresis loops measured at the even-order and at the half-order Bragg peaks demonstrate the biquadratic type of AF coupling for Fe/ Cr multilayer. Experimental data were simulated using the matrix formalizm in order to go away from macroscopic magnetic properties of such superlattices and to understand their layer-by-layer magnetic structure. r
The induced magnetic moments in the V 3d electronic states of interface atomic layers in a Fe(6ML)/V (7ML) superlattice was investigated by x-ray resonant magnetic scattering. The first V atomic layer next to Fe was found to be strongly antiferromagnetically polarized relatively to Fe and the magnetic moments of the next few atomic layers in the interior V region decay exponentially with increasing distance from the interface, while the magnetic moments of the Fe atomic layers largely remain bulk-like. The induced V moments decay more rapidly as observed by x-ray magnetic scattering than in standard x-ray magnetic circular dichroism. The theoretical description of the induced magnetic atomic layer profile in V was found to strongly rely on the interface roughness within the superlattice period. These results provide new insight into interface magnetism by taking advantage of the enhanced depth sensitivity to the magnetic profile over a certain resonant energy bandwidth in the vicinity of the Bragg angles.
Soft-x-ray resonant scattering from V/Fe (001) magnetic superlattices
Physical Review B, 1999
The magnetic properties of Fe and V in (n ML V / 5 ML Fe͒ ͑001͒ superlattices (nϭ1, 2, and 5 ML͒ have been investigated by measuring the magnetization dependent scattering of elliptically polarized soft x rays at various scattering angles and for photon energies across the 2p x-ray-absorption edges of both Fe and V. A quantitative estimate of the magnetic moment induced on vanadium is obtained from the analysis of the resonant scattering data. ͓S0163-1829͑99͒50842-4͔ RAPID COMMUNICATIONS R12 572 PRB 60 MAURIZIO SACCHI et al.
Applied Surface Science, 2007
Soft X-ray resonant magnetic scattering (SXRMS) has been used to investigate the microscopic magnetization reversal behavior of complex magnetic systems. SXRMS is a unique technique, providing chemical, spatial and magnetic sensitivity, which is not affected by external magnetic fields. The study of two selected thin magnetic heterostructures is presented, amorphous rare-earth transition metal alloys and perpendicular exchange coupled antiferromagnetic/ferromagnetic films. In the first system, the internal structure of magnetic stripe domains on nanometer length scales is obtained by measuring bi-dimensional (2D) scattering images. In the second system, the element specificity is exploited to identify the role of the uncompensated spins in the antiferromagnetic layer on the exchange coupling phenomena. Future trends are also discussed. # 2007 Published by Elsevier B.V.
Transverse and Lateral Structure of the Spin-Flop Phase in Fe/Cr Antiferromagnetic Superlattices
Physical Review Letters, 2002
Direct evidence of the nonuniformly canted state of the spin-flop phase induced by a magnetic field applied to Fe=Cr100 superlattices is obtained by polarized neutron reflectometry. It is unambiguously demonstrated that the magnetization of the alternating Fe layers is twisted through the multilayer stack proving a stable noncollinear configuration. The maximal tilt at the end layers progressively reduces towards the center of the multilayer. The set of tilt angles is deduced from a model-free data evaluation employing the supermatrix routine. Spin-flip off-specular scattering is determined by the in-plane magnetization fluctuations and is fitted by a theoretical model of domains.
Applied Physics Letters, 2011
We investigate the macroscopic and microscopic magnetic reversal in perpendicular anisotropy antiferromagnetically ͑AF͒ coupled ͓Co/ Pt͔ N−1 / Co-Ru-͓Co/ Ni͔ M−1 / Co-Ru-͓Co/ Pt͔ N−1 / Co multilayers ͑ML͒ using soft x-ray spectroholography and local, as well as area-integrated, soft x-ray hysteresis loop techniques. For N = 25ӷ M = 3 we find ferrimagnetic stripe domains in remanence due to the combination of strong dipolar fields from the thick Co/Pt MLs with a strong AF-interlayer exchange coupling of the thin Co/Ni ML in the center, which reverses its polarity three times during a magnetic field reversal. Furthermore, local hysteresis loops reveal distinct random spin-flip avalanches, thus indicating the existence of local magnetic pinning sites due to the insertion of the center Co/Ni stack.