Magnetic field induced chirality in Ho/Y multilayers with gradually decreasing anisotropy

Tarnavich, V. V.; Tartakovskaya, E. V.; Chetverikov, Yu. O.; Golub, Vladimir; Lott, D.; Chernenkov, Yu. P.; Devishvili, Anton; Ukleev, Victor; Kapaklis, Vassilios; Oleshkevych, Аnna; Fedorov, V. I.; Bairamukov, V. Yu.; Vorobiev, Alexeï; Grigoriev, S. V.

doi:10.1103/physrevb.96.014415

Cited by 5 publications

(3 citation statements)

References 23 publications

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“…The periodicity of the magnetic structure in the Ho layers at zero H is found to be λ Ho = 25 Å with a coherence length ξ ∼ 510 Å. The value of ξ corresponds to about 5 periods of the SL, and is in excellent agreement with the SL structural coherence length of about 500 Å reported previously 26 . An additional peak that cannot be explained by the helical or structural order of SL appears at Q z = 0.39 Å−1 below T N .…”

Section: Methodssupporting

confidence: 88%

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Coherent charge and magnetic ordering in Ho/Y superlattice revealed by element-selective x-ray scattering

et al. 2019

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Magnetic rare-earth / non-magnetic metal superlattices are well-known to display chiral spin helices in the rare-earth layers that propagate coherently across the non-magnetic layers. However, the underlying mechanism that preserves the magnetic phase and chirality coherence across the non-magnetic layers has remained elusive. In this Letter, we use resonant and element-specific x-ray scattering to evidence directly the formation of two fundamentally different long-range modulations in a Holmium/Yttrium (Ho/Y) multilayer: the known Ho chiral spin helix with periodicity 25Å, and a newly observed charge density wave with periodicity 16Å that propagates through both the Ho and non-magnetic Y layer. With x-ray circular magnetic dichroism measurements ruling out the existence of a magnetic proximity effect induced moment in the non-magnetic Y layers, we propose that the charge density wave is also chiral, thus providing the means for the transmittance of magnetic chirality coherence between Ho layers. * victor.ukleev@psi.ch

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Section: Methodssupporting

confidence: 88%

“…[22][23][24][25] . Indeed, we have shown recently that the presence of terraces on the surface of a sapphire substrate underneath a Ho/Y SL is responsible for inducing an effective uniaxial magnetic anisotropy, that is inhomogeneously distributed along the growth direction, resulting in a preferred handedness of the spin spirals 26 .…”

Section: Introductionmentioning

confidence: 99%

Coherent charge and magnetic ordering in Ho/Y superlattice revealed by element-selective x-ray scattering

et al. 2019

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“…An interesting feature we observed in our experiment is non-equality of up-down and down-up scattering channels. Such an asymmetry of the spin-flip signal is rather exotic phenomenon taking place under certain conditions in elastic experiment on helimagnets [39][40][41][42][43][44] or inelastic experiments by magnons [45] in bulk systems. There is, however, a simpler explanation related to Zeeman splitting of the neutron energy with different polarization in a large external field [46][47][48][49][50][51].…”

Section: Discussionmentioning

confidence: 99%

Chirality of Bloch domain walls in exchange biased CoO/Co bilayer seen by waveguide-enhanced neutron spin-flip scattering

Khaydukov,

Lenk,

Zdravkov

et al. 2021

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Magnetic state of exchanged biased CoO(20nm)/Co(dF ) bilayer (dF =5-20nm) was studied by means of polarized neutron reflectometry. By spacing of CoO/Co bilayer and Al2O3 substrate with Nb(20nm) layer we created waveguide structure which allowed us to significantly enhance intensity of spin-flip (SF) scattering in the position of optical resonances. For the trained sample with thinnest Co(5nm) we detected strong SF scattering at the resonance position (up to 30% of incoming intensity) speaking about high non-collinearity of the system. As dF increases, the intensity of SF scattering linearly decreases. At the same time we observed asymmetry of up-down and down-up scattering channels at the resonance positions. We attribute this asymmetry to the Zeeman splitting of neutrons energies with different initial polarization taking place in high external field. Analysis, however, shows that the applied in the PNR experiment external field is not enough to quantitatively explain the observed asymmetry for the samples with dF > 5nm and we have to postulate presence of additional magnetic field produced by sample. We attribute this additional field to the stray field produced by chiral Bloch domain walls. The chirality of the domain walls can be explained by Dzyaloshinskii-Moriya interaction arising at the CoO/Co interface. Our results can be useful for designing of spintronic devices using exchange bias effect.

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Chirality of Bloch domain walls in exchange-biased CoO/Co bilayer studied by waveguide-enhanced neutron spin-flip scattering

et al. 2021

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Magnetic field induced chirality in Ho/Y multilayers with gradually decreasing anisotropy

Cited by 5 publications

References 23 publications

Coherent charge and magnetic ordering in Ho/Y superlattice revealed by element-selective x-ray scattering

Coherent charge and magnetic ordering in Ho/Y superlattice revealed by element-selective x-ray scattering

Chirality of Bloch domain walls in exchange biased CoO/Co bilayer seen by waveguide-enhanced neutron spin-flip scattering

Chirality of Bloch domain walls in exchange-biased CoO/Co bilayer studied by waveguide-enhanced neutron spin-flip scattering

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