Interlayer exchange coupling in Er|Tb superlattices mediated by short range incommensurate Er order

Pfuhl, E; Voigt, Jörg; Mattauch, Stefan; Korolkov, Denis; Brückel, Thomas

doi:10.1088/1742-6596/211/1/012019

Cited by 1 publication

(3 citation statements)

References 14 publications

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“…In Ref. 21 , the neutron data shown was for the superlattice. Here, we focus on the off-specular neutron scattering measurements from the superlattice.…”

Section: Resultsmentioning

confidence: 99%

“…9 and references therein). In superlattices, for example, the Tb layers order ferromagnetically at K and couple antiferromagnetically with the next layer of the superlattice 21 . The Er layers show short range incommensurable magnetic structures (IMS) below 100 K. Apparently, different anisotropies of the constituent layers prevent the formation of a long range order for the incommensurable structures.…”

Section: Discussionmentioning

confidence: 99%

“…Note that Er has undergone a transition from a predominant basal plane helix—type structure to a cone—like structure at 20 K. In bulk Er, a sinusoidal longitudinal phase with an ordering vector , corresponding to a period of approximately 7 layers (here the reciprocal lattice vector along the c-axis is ) at 84 K, changes to below 52 K. Below 20 K, there is a first order transition to a cone phase which has a ferromagnetic moment along the c-axis and a helical order in the basal-plane component at 25 . It is interesting to note that the turn angle accumulated across 21 atomic layers of Er makes it commensurate with the superlattice periodicity 21 .…”

Section: Discussionmentioning

confidence: 99%

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Stiffness in vortex—like structures due to chirality-domains within a coupled helical rare-earth superlattice

Paul

2016

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Vortex domain walls poses chirality or ‘handedness’ which can be exploited to act as memory units by changing their polarity with electric field or driving/manupulating the vortex itself by electric currents in multiferroics. Recently, domain walls formed by one dimensional array of vortex—like structures have been theoretically predicted to exist in disordered rare-earth helical magnets with topological defects. Here, in this report, we have used a combination of two rare-earth metals, e.g. superlattice that leads to long range magnetic order despite their competing anisotropies along the out-of-plane (Er) and in-plane (Tb) directions. Probing the vertically correlated magnetic structures by off-specular polarized neutron scattering we confirm the existence of such magnetic vortex—like domains associated with magnetic helical ordering within the Er layers. The vortex—like structures are predicted to have opposite chirality, side—by—side, and are fairly unaffected by the introduction of magnetic ordering between the interfacial Tb layers and also with the increase in magnetic field which is a direct consequence of screening of the vorticity in the system due to a helical background. Overall, the stability of these vortices over a wide range of temperatures, fields and interfacial coupling, opens up the opportunity for fundamental chiral spintronics in unconventional systems.

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“…In Ref. 21 , the neutron data shown was for the superlattice. Here, we focus on the off-specular neutron scattering measurements from the superlattice.…”

Section: Resultsmentioning

confidence: 99%