Magnetic phase diagram for spin-density waves in thin epitaxial Cr(001) films

Sonntag, Philippe; Bödeker, P.; Schreyer, A.; Zabel, H.; Hamacher, K.; Kaiser, H.

doi:10.1016/s0304-8853(97)01056-1

Cited by 32 publications

(22 citation statements)

References 32 publications

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“…5(c), we see also two peaks, of inequivalent intensities, which is an artefact due to impurities within the substrate. We thus observe one single propagation vector, oriented along the film normal as already reported by other studies on Cr thin films [7], and as expected from the strain state measured by XRD [25]. The magnetic structure stays essentially the same in the whole temperature range we studied.…”

Section: B Spin Density Waves In Cr/mgo/cr Trilayerssupporting

confidence: 69%

“…4(c)]: Using d ln Q/dp = 5.5.10 −12 Pa −1 , observed both for thin films and bulk samples [7], the observed value of δ should correspond to a stress of 2.3 GPa, more than one order of magnitude larger than the value we actually measured. Another possible explanation for the value of δ , indirectly linked to strain, could be the presence of a lattice of misfit dislocations.…”

Section: A Strain and Magnetic Properties Of Cr/mgo/cr Trilayerscontrasting

confidence: 41%

“…These would be the signature of a magnetic coupling in our systems, and would be localized near the Cr/MgO interfaces. For Cr(1 1 0) and Cr(0 0 1) surfaces, the magnetic ordering of Cr (anisotropy and phase) can indeed be modified on a significant thickness through interface effects [7,9,36,37]. In our case, the modification of the local magnetic order is more subtle as the incommensurability parameter has an intermediate value δ ≈ δ ≈ 0.035 between that of the top δ = 0 and the bottom δ ≈ 0.047 layer.…”

Section: B Electronic Structure Of Cr/mgo/cr Trilayersmentioning

confidence: 83%

“…The discovery of giant magnetoresistance in Fe/Cr superlattices [5] triggered an intense research effort on the magnetic properties of Cr thin films [6,7] and multilayers [8][9][10][11][12]. In all these examples, the magnetism remains purely itinerant since all layers are metallic.…”

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confidence: 99%

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Tunnel-mediated coupling between antiferromagnetic thin films

et al. 2014

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International audienceThe study, tailoring, and control of the coupling between magnetic layers triggered the development of spintronics and has been up to now focused on systems comprising at least one ferromagnetic layer. Here we present a system where two antiferromagnetic layers separated by an ultrathin tunnel barrier interact with each other. We have studied with neutron and x-ray diffraction two sets of Cr/MgO/Cr trilayers, with either thin (five monolayers or less) or thick (eight monolayers or more) MgO layers, along with isolated Cr layers used as references. While the behavior of the trilayers with thick MgO layers can be explained by the strain state of each layer, that of trilayers with thin barriers cannot be related to the well known behavior of isolated chromium layers. We indeed report in these samples the presence of anomalous magnetic phases (modified propagation vector, direction of spins and propagation vectors inconsistent with the strain state of the sample) that we ascribe to the existence of a tunnel magnetic coupling between the AF layers through the insulating barrier. This unexpected finding opens opportunities for spintronics using solely antiferromagnets

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Section: B Spin Density Waves In Cr/mgo/cr Trilayerssupporting

confidence: 69%

Section: A Strain and Magnetic Properties Of Cr/mgo/cr Trilayerscontrasting

confidence: 41%

Section: B Electronic Structure Of Cr/mgo/cr Trilayersmentioning

confidence: 83%

mentioning

confidence: 99%

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Tunnel-mediated coupling between antiferromagnetic thin films

et al. 2014

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“…However, it has been shown that in thin films the SDW confinement leads to the quantization of the wave vector Q N , N being an integer, which orients perpendicular to the film surfaces. [5,6] This quantization is due to the boundary conditions imposed by the film surfaces or interfaces. Rich hysteretic phenomena in the electronic transport properties [7,8] have been ascribed to the development of domains with different Q N corresponding to a different number of nodes of the SDW.…”

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confidence: 99%

Barkhausen-type noise in the resistance of antiferromagnetic Cr thin films

Tosi¹,

Osquiguil²,

Kaul³

et al. 2012

EPL

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-We present an experimental study of the changes generated on the electrical resistance R(T ) of epitaxial Cr thin films by the transformation of quantized spin density wave domains as the temperature is changed. A characteristic resistance noise appears only within the same temperature region where a cooling-warming cycle in R(T ) displays hysteretic behavior. We propose an analysis based on an analogy with the Barkhausen noise seen in ferromagnets. There fluctuations in the magnetization M (H) occur when the magnetic field H is swept. By mapping M → Ψ0 and H → T , where Ψ0 corresponds to the order parameter of the spin density wave, we generalize the Preisach model in terms of a random distribution of resistive hysterons to explain our results. These hysterons are related to distributions of quantized spin density wave domains with different sizes, local energies and number of nodes.

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