Coherent ac spin current transmission across an antiferromagnetic CoO insulator

Abstract

The recent discovery of spin-current transmission through antiferromagnetic (AFM) insulating materials opens up unprecedented opportunities for fundamental physics and spintronics applications. The great mystery currently surrounding this topic is: how could THz AFM magnons mediate a GHz spin current? This mis-match of frequencies becomes particularly critical for the case of coherent ac spin-current, raising the fundamental question of whether a GHz ac spin-current can ever keep its coherence inside an AFM insulator and so drive the spin precession of another FM layer coherently? Utilizing element- and time-resolved x-ray pump-probe measurements on Py/Ag/CoO/Ag/Fe75Co25/MgO(001) heterostructures, we demonstrate that a coherent GHz ac spin current pumped by the permalloy (Py) ferromagnetic resonance (FMR) can transmit coherently across an antiferromagnetic CoO insulating layer to drive a coherent spin precession of the FM Fe75Co25 layer. Further measurement results favor thermal magnons rather than evanescent spin waves as the mediator of the coherent ac spin current in CoO.

References in corpus (15)

• Antiferromagnetic spintronics
• Antiferromagnetic spintronics
• Electrical switching of an antiferromagnet
• Electrically controlled long-distance spin transport through an antiferromagnetic insulator
• Spin pumping and spin-transfer torques in antiferromagnets
• Antiferromagnonic Spin Transport from Y${}_3$Fe${}_5$O${}_{12}$ into NiO
• Enhancement of Thermally Injected Spin Current through an Antiferromagnetic Insulator
• Spin-current probe for phase transition in an insulator
• Enhanced spin pumping efficiency in antiferromagnetic IrMn thin films around the magnetic phase transition
• Conduction of spin currents through insulating oxides
• Spin colossal magnetoresistance in an antiferromagnetic insulator
• Transformation of spin current by antiferromagnetic insulators
• Direct detection of pure spin-current by x-ray pump-probe measurements
• Temperature Dependence of Angular Momentum Transport Across Interfaces
• Interlayer Couplings Mediated by Antiferromagnetic Magnons

Cited by in corpus (12)

• Room temperature antiferromagnetic resonance and inverse spin-Hall voltage in canted antiferromagnets
• Coherent transfer of spin angular momentum by evanescent spin waves within antiferromagnetic NiO
• Manipulation of coupling and magnon transport in magnetic metal-insulator hybrid structures
• Local and nonlocal spin Seebeck effect in lateral Pt-$\mathrm{C}{\mathrm{r}}_2{\mathrm{O}}_3$-Pt devices at low temperatures
• Role of NiO in the nonlocal spin transport through thin NiO films on Y${}_3$Fe${}_5$O${}_{12}$
• Absorption of Transverse Spin Current in Ferromagnetic NiCu: Dominance of Bulk Dephasing over Spin-Flip Scattering
• Sub-Nanosecond Spin-Transfer Torque in an Ensemble of Superparamagnetic-Like Nanomagnets
• Observation of Coherently Coupled Cation Spin Dynamics in an Insulating Ferrimagnetic Oxide
• Electron-magnon spin conversion and magnonic spin pumping in antiferromagnet/heavy metal heterostructure
• Suppression of Spin Pumping at Metal Interfaces
• Absence of magnetic order in epitaxial RuO2 revealed by X-ray linear dichroism
• Ginzburg-Landau theory of spin pumping through an antiferromagnetic layer near the Néel temperature