An insulating doped antiferromagnet with low magnetic symmetry as a room temperature spin conduit

We report room temperature long-distance spin transport of magnons in antiferromagnetic thin film hematite doped with Zn. The additional dopants significantly alter the magnetic anisotropies, resulting in a complex equilibrium spin structure that is capable of efficiently transporting spin angular m...

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Vydáno v:arXiv.org
Hlavní autoři: Ross, Andrew, Lebrun, Romain, Baldrati, Lorenzo, Kamra, Akashdeep, Gomonay, Olena, Ding, Shilei, Schreiber, Felix, Backes, Dirk, Maccherozzi, Francesco, Grave, Daniel A, Rothschild, Avner, Sinova, Jairo, Kläui, Mathias
Médium: Paper
Jazyk:angličtina
Vydáno: Ithaca Cornell University Library, arXiv.org 19.11.2020
Témata:
Angular momentum
Anisotropy
Antiferromagnetism
Dopants
Ellipticity
Hematite
Magnetic damping
Magnetic domains
Magnetoresistance
Magnetoresistivity
Magnons
Room temperature
Spin structure
Thin films
ISSN:2331-8422
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Abstract We report room temperature long-distance spin transport of magnons in antiferromagnetic thin film hematite doped with Zn. The additional dopants significantly alter the magnetic anisotropies, resulting in a complex equilibrium spin structure that is capable of efficiently transporting spin angular momentum at room temperature without the need for a well-defined, pure easy-axis or easy-plane anisotropy. We find intrinsic magnon spin-diffusion lengths of up to 1.5 {\mu}m, and magnetic domain governed decay lengths of 175 nm for the low frequency magnons, through electrical transport measurements demonstrating that the introduction of non-magnetic dopants does not strongly reduce the transport length scale showing that the magnetic damping of hematite is not significantly increased. We observe a complex field dependence of the non-local signal independent of the magnetic state visible in the local magnetoresistance and direct magnetic imaging of the antiferromagnetic domain structure. We explain our results in terms of a varying and applied-field-dependent ellipticity of the magnon modes reaching the detector electrode allowing us to tune the spin transport.
AbstractList We report room temperature long-distance spin transport of magnons in antiferromagnetic thin film hematite doped with Zn. The additional dopants significantly alter the magnetic anisotropies, resulting in a complex equilibrium spin structure that is capable of efficiently transporting spin angular momentum at room temperature without the need for a well-defined, pure easy-axis or easy-plane anisotropy. We find intrinsic magnon spin-diffusion lengths of up to 1.5 {\mu}m, and magnetic domain governed decay lengths of 175 nm for the low frequency magnons, through electrical transport measurements demonstrating that the introduction of non-magnetic dopants does not strongly reduce the transport length scale showing that the magnetic damping of hematite is not significantly increased. We observe a complex field dependence of the non-local signal independent of the magnetic state visible in the local magnetoresistance and direct magnetic imaging of the antiferromagnetic domain structure. We explain our results in terms of a varying and applied-field-dependent ellipticity of the magnon modes reaching the detector electrode allowing us to tune the spin transport.
Author Maccherozzi, Francesco
Schreiber, Felix
Sinova, Jairo
Gomonay, Olena
Rothschild, Avner
Kamra, Akashdeep
Ross, Andrew
Baldrati, Lorenzo
Ding, Shilei
Backes, Dirk
Kläui, Mathias
Lebrun, Romain
Grave, Daniel A
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Snippet We report room temperature long-distance spin transport of magnons in antiferromagnetic thin film hematite doped with Zn. The additional dopants significantly...
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SubjectTerms Angular momentum
Anisotropy
Antiferromagnetism
Dopants
Ellipticity
Hematite
Magnetic damping
Magnetic domains
Magnetoresistance
Magnetoresistivity
Magnons
Room temperature
Spin structure
Thin films
Title An insulating doped antiferromagnet with low magnetic symmetry as a room temperature spin conduit
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