Enhancement of Thermally Injected Spin Current through an Antiferromagnetic Insulator.

@article{Lin2016EnhancementOT,
  title={Enhancement of Thermally Injected Spin Current through an Antiferromagnetic Insulator.},
  author={Weiwei Lin and Kai Chen and Shufeng Zhang and C. L. Chien},
  journal={Physical review letters},
  year={2016},
  volume={116 18},
  pages={
          186601
        }
}
We report a large enhancement of thermally injected spin current in normal metal (NM)/antiferromagnet (AF)/yttrium iron garnet (YIG), where a thin AF insulating layer of NiO or CoO can enhance the spin current from YIG to a NM by up to a factor of 10. The spin current enhancement in NM/AF/YIG, with a pronounced maximum near the Néel temperature of the thin AF layer, has been found to scale linearly with the spin-mixing conductance at the NM/YIG interface for NM=3d, 4d, and 5d metals… 

Figures from this paper

Probe of antiferromagnetic transition via thermal-excited incoherent spin current
Spin Seebeck effect (SSE) for an yttrium iron garnet (YIG)/nickel oxide (NiO)/platinum (Pt) trilayer device was studied in a wide temperature range. It is found that the SSE signal is nonmonotonic in
Antiferromagnet-based magnonic spin-transfer torque
In an antiferromagnet (AF) with uniaxial anisotropy, spin-up and spin-down magnon excitations coexist and form an internal degree of freedom. A magnon spin current can be thermally generated near an
Theory of spin transport through an antiferromagnetic insulator
A theoretical formulation for spin transport through an antiferromagnetic (AF) insulator is presented in the case driven/detected by direct/inverse spin Hall effect in two heavy metal contacts. The
Strong modification of intrinsic spin Hall effect in FeMn with antiferromagnetic order formation
FeMn films with and without a Cu seed layer were deposited on Y3Fe5O12 (YIG) substrates, and their inverse spin Hall effect (ISHE) was examined through both spin Seebeck effect and spin pumping. From
Anomalous Hall-like effect probe of antiferromagnetic domain wall
TLDR
This work will help to clarify the mechanism of the spin current propagation in AF materials and fully understand the physics behind exchange bias.
Coherent Transfer of Spin Angular Momentum by Evanescent Spin Waves within Antiferromagnetic NiO.
TLDR
The spin current is found to be mediated by coherent evanescent spin waves of GHz frequency, rather than propagating magnons of THz frequency, paving the way towards coherent control of the phase and amplitude of spin currents within an antiferromagnetic insulator at room temperature.
Enhanced room-temperature spin Seebeck effect in a YIG/C60/Pt layered heterostructure
We report on large enhancement of the longitudinal spin Seebeck effect (LSSE) in the Y3Fe5O12 (YIG)/Pt system at room temperature due to the addition of a thin layer of organic semiconductor (C60) in
Paramagnon-Enhanced Spin Currents in a Lattice near the Curie Point
TLDR
It is shown that pure spin currents carried by conduction electrons injected into a paramagnetic lattice of mutually interacting localized magnetic moments can be enhanced close to the Curie temperature by the exchange interaction between the lattice sites and the non vanishing spin density associated with the spin current.
Electron-magnon spin conversion and magnonic spin pumping in an antiferromagnet/heavy metal heterostructure
We study the exchange between electron and magnon spins at the interface of an antiferromagnet and a heavy metal at finite temperatures. The underlying physical mechanism is based on spin torque
...
...

References

SHOWING 1-10 OF 38 REFERENCES
Anti-damping spin transfer torque through epitaxial Nickel oxide
We prepare the high quality epitaxial MgO(001)[100]/Pt(001)[100]/NiO(001)[100]/FeNi/SiO2 films to investigate the spin transport in the NiO antiferromagnetic insulator. The ferromagnetic resonance
Antiferromagnonic spin transport from Y3Fe5O12 into NiO.
We observe highly efficient dynamic spin injection from Y3Fe5O12 (YIG) into NiO, an antiferromagnetic (AF) insulator, via strong coupling, and robust spin propagation in NiO up to 100-nm thickness
Enhanced Spin Pumping Efficiency in Antiferromagnetic IrMn Thin Films around the Magnetic Phase Transition.
TLDR
By spotting the spin pumping peak, the thickness dependence of the IrMn critical temperature could be determined and the characteristic length for the spin-spin interactions was deduced.
Observation of longitudinal spin-Seebeck effect in magnetic insulators
We propose a longitudinal spin-Seebeck effect (SSE), in which a magnon-induced spin current is injected parallel to a temperature gradient from a ferromagnet into an attached paramagnetic metal. The
Antiferromagnetic phase transition and spin correlations in NiO
We have investigated the antiferromagnetic AF phase transition and spin correlations in NiO by hightemperature neutron diffraction below and above TN. We show that AF phase transition is a continuous
Antiferromagnet-Mediated Spin Transfer Between Metal and Ferromagnet
We develop a theory for spin transported by coherent Neel dynamics through an antiferromagnetic insulator coupled to a ferromagnetic insulator on one side and a current-carrying normal metal with
Conduction of spin currents through insulating antiferromagnetic oxides
Damping processes, associated to magnetization dynamics, allow to generate spin currents from precessing ferromagnets. These can be transmitted into adjacent conducting layers through an interface
Theory of magnon-driven spin Seebeck effect
The spin Seebeck effect is a spin-motive force generated by a temperature gradient in a ferromagnet that can be detected via normal metal contacts through the inverse spin Hall effect [K. Uchida et
Enhanced dc spin pumping into a fluctuating ferromagnet near T C
A linear-response formulation of the dc spin pumping, i.e., a spin injection from a precessing ferromagnet into an adjacent spin sink, is developed in view of describing many-body effects caused by
Enhancement of Pure Spin Currents in Spin Pumping Y 3 Fe 5 O 12 / Cu / Metal Trilayers through Spin Conductance Matching
Spin transport efficiency in heterostructures depends on the spin conductances of each constituent and their interfaces. We report a comparative study of spin pumping in Y3Fe5O12/Cu/Pt and
...
...