Spin transport across antiferromagnets induced by the spin Seebeck effect

Abstract

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.

arXiv comment10 pages, 6 figures

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• Antiferromagnetic spintronics
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• Spin Seebeck effect through antiferromagnetic NiO
• Propagation of Thermally Induced Magnonic Spin Currents
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• Magnetic field control of the spin Seebeck effect
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Cited by in corpus (14)

• Electrically controlled long-distance spin transport through an antiferromagnetic insulator
• Propagation length of antiferromagnetic magnons governed by domain configurations
• Antiferromagnetic magnon spintronic based on non-reciprocal and non-degenerated ultra-fast spin-waves in the canted antiferromagnet α-Fe2O3
• Structural sensitivity of the spin Hall magnetoresistance in antiferromagnetic thin films
• Unveiling domain wall dynamics of ferrimagnets in thermal magnon currents: competition of angular momentum transfer and entropic torque
• Exceptional sign changes of the non-local spin Seebeck effect in antiferromagnetic hematite
• Spin correlation function theory of spin-charge conversion effects
• Spin-dependent (inverse) spin Hall effect in Co${}_{60}$Fe${}_{20}$B${}_{20}$
• Role of spin mixing conductance in determining thermal spin pumping near the ferromagnetic phase transition in EuO_{1-x} and La2NiMnO6
• Theory of spin transport through antiferromagnetic insulator
• Spin decoherence independent of antiferromagnetic order in IrMn
• Thermal effects in spintronic materials and devices: an experimentalist's guide
• Magnon dispersion and spin transport in CrCl${}_3$ bilayers under different strain-induced magnetic states
• Magnonic Proximity Effect in Insulating Ferro- and Antiferromagnetic Trilayers