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RESEARCH PRODUCT
Spin transport across antiferromagnets induced by the spin Seebeck effect
Eiji SaitohMathias KläuiBo-wen DongBo-wen DongJoel CramerZhiyong QiuUlrike RitzmannUlrike RitzmannUlrich NowakSamridh JaiswalSamridh Jaiswalsubject
Phase transitionAngular momentumAcoustics and UltrasonicsMagnetoresistance530 PhysicsFOS: Physical sciencesantiferromagnetic spintroncis02 engineering and technology01 natural sciencesCondensed Matter::Materials Science0103 physical sciencesAntiferromagnetismddc:530010306 general physicsGeneralLiterature_REFERENCE(e.g.dictionariesencyclopediasglossaries)Spin-½PhysicsCondensed Matter - Materials ScienceSpintronicsCondensed matter physicsMagnonMaterials Science (cond-mat.mtrl-sci)021001 nanoscience & nanotechnology530 PhysikCondensed Matter::Mesoscopic Systems and Quantum Hall EffectCondensed Matter PhysicsSurfaces Coatings and FilmsElectronic Optical and Magnetic MaterialsFerromagnetismspin Seebeck effectmagnon spin currentsCondensed Matter::Strongly Correlated Electrons0210 nano-technologyDen kondenserade materiens fysikdescription
For prospective spintronics devices based on the propagation of pure spin currents, antiferromagnets are an interesting class of materials that potentially entail a number of advantages as compared to ferromagnets. Here, we present a detailed theoretical study of magnonic spin current transport in ferromagnetic-antiferromagnetic multilayers by using atomistic spin dynamics simulations. The relevant length scales of magnonic spin transport in antiferromagnets are determined. We demonstrate the transfer of angular momentum from a ferromagnet into an antiferromagnet due to the excitation of only one magnon branch in the antiferromagnet. As an experimental system, we ascertain the transport across an antiferromagnet in YIG$|$Ir$_{20}$Mn$_{80}|$Pt heterostructures. We determine the spin transport signals for spin currents generated in the YIG by the spin Seebeck effect and compare to measurements of the spin Hall magnetoresistance in the heterostructure stack. By means of temperature-dependent and thickness-dependent measurements, we deduce conclusions on the spin transport mechanism across IrMn and furthermore correlate it to its paramagnetic-antiferromagnetic phase transition.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2018-03-09 |