Induced magnetism at the interfaces of a Fe/V superlattice investigated by resonant magnetic x-ray scattering (original) (raw)
Related papers
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.
Stability of the induced magnetic V moment in Fe/V superlattices upon Hydrogen loading
Superlattices and Microstructures, 2007
We report on the stability of the V magnetic moment within Fe/V superlattices upon H-uptake. At the Fe/V interface V atoms acquire a magnetic moment, antiparallel aligned to the Fe moments. Upon hydrogen loading the saturation magnetization was found to increase. We utilized element specific X-ray resonant magnetic scattering to address the response of the induced V moments. An epitaxial [Fe(5ML)/V(16ML)] × 30 superlattice was employed. The soft x-ray measurements were carried out using the ALICE diffractometer at BESSY II in Berlin, Germany. The data clearly show the stability of the V moment upon H-loading. No change of the magnetic asymmetry at the V edge could be recognized. Our measurements confirm ab-initio calculations predicting a stable V moment and an increase of the Fe moment in H loaded Fe/V superlattices.
Hydrogen induced changes of the interlayer coupling in Fe(3)/V(x) superlattices (x=11–16)
Journal of Magnetism and Magnetic Materials, 1999
The effect of hydrogen on the magnetic exchange coupling between iron layers through vanadium spacer layers has been studied with magneto-optical Kerr effect experiments in Fe /V V superlattices. Here x refers to the number of V monolayers varying from 11 to 16 and the Fe layer thickness is fixed at three monolayers. Without hydrogen the superlattice is antiferromagnetic (AFM) for x between 12 and 14 and ferromagnetic (FM) in all other cases. With hydrogen loading the coupling can be switched from AFM to FM and vice versa. As previously observed with neutron reflectivity measurements (Hjo¨rvarsson et al., Phys. Rev. Lett. 79 (1997) 901) the change of the interlayer coupling upon hydrogen uptake is not simply due to the expansion of the non-magnetic vanadium spacer layer but more likely to the distortion of the Fermi surface. Bilinear and biquadratic exchange couplings can be recognized by the magnetic hysteresis loops and their coupling energies have been extracted by fits to the curves. For all samples the easy axis of the magnetization is in the plane without any preferred in-plane direction. Hydrogen loading does not affect the magnetic anisotropy of these samples. . 0304-8853/99/$ -see front matter 1999 Elsevier Science B.V. All rights reserved. PII: S 0 3 0 4 -8 8 5 3 ( 9 8 ) 0 0 5 4 6 -0
X-ray resonant magnetic scattering by Fe/Cr superlattices
Superlattices and Microstructures, 2005
We have studied the structural and magnetic properties of an antiferromagnetically (AF) coupled Fe/Cr superlattice by means of soft x-ray resonant magnetic scattering. Strong and purely magnetic Bragg peaks are observed at the half-order positions in reciprocal space parallel to the [001] growth direction and in between the structural Bragg reflections from the superlattice periodicity. The magnetic hysteresis loops measured at the first-order and at the half-order Bragg peaks clearly demonstrate the strong AF coupling of the Fe/Cr multilayer. Transverse scans and off-specular reflectivity measurements confirm an AF domain structure of the superlattice in remanence with large perpendicular correlation. In addition, the transverse scan of the half-order Bragg peak exhibits a Lorentzian line shape at zero field, which diminishes in higher fields, indicative of a remanent multidomain state approaching a single-domain state towards saturation.
Influence of boundaries on magnetic ordering in Fe/V superlattices
Physical Review B, 2010
We study the role of surface boundaries on the magnetic properties of ͓Fe/ V͔ n superlattice structures, with n = 2 -10. Using the magneto-optical Kerr effect and polarized neutron reflectivity measurements, we examine the evolution of both the total and the layer-resolved magnetizations as a function of temperature. By varying n, we observe a large shift in the transition temperatures T c and a substantial change in the total magnetization critical exponent . In particular, the thicker samples exhibit nonuniversal exponent values. By resolving the magnetization as a function of position within the superlattice, we show that this behavior arises from contributions of the surfaces. Furthermore, we attribute the large shift in T c to long-ranged interactions present in the superlattice.
The effect of strain and interfaces on the orbital moment in Fe/V superlattices
Journal of Magnetism and Magnetic Materials, 2007
The dependence of the Fe orbital moment on strain and interfaces in Fe/V superlattices has been investigated by X-ray magnetic circular dichroism (XMCD). The orbital moment was determined to be lower at the interfaces than in the bulk, which we attribute to Fe–V hybridization. An enhancement of the orbital moment with increasing strain in the Fe layers was observed. This
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
Physical Review B, 2005
The magnetism of the ferromagnetic half-metallic Heusler compounds at the interface with other metals, insulators, and semiconductors is a critical issue when judging the prospects for these materials to be used in future spintronic devices. We study the interface magnetism of the ferromagnetic half metal Co 2 MnGe in a high-quality ͓Co 2 MnGe/ Au͔ 50 multilayer by x-ray resonant magnetic reflectivity using circularly polarized x-ray radiation in the energy range of the Co and Mn L 2,3 edges. An analysis of the magnetic part of the reflectivity at the superlattice Bragg peaks allows a precise determination of the magnetization profile within the Co 2 MnGe layers. We find that the profile is definitely different for Mn and Co spins and asymmetric with respect to the growth direction. At room temperature nonferromagnetic interface layers exist with a thickness of about 0.45 nm at the bottom and 0.3 nm at the top of the Co 2 MnGe layers. Additionally, the comparison of the nonresonant and resonant magnetic diffuse scattering reveals that the correlated structural and magnetic roughness are almost identical, the corresponding length scale being the in-plane crystallite size.
Investigating phase transitions in a model Fe/V magnetic superlattice
Bulletin of the Russian Academy of Sciences: Physics
We propose a model of an iron vanadium superlattice for investigating phase transitions in multi layers. Several basic types of temperature dependences of spontaneous (resultant) magnetization in a mag netic superlattice model are revealed for the first time for various values of an interlayer exchange interaction.