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Published on: March 24, 2019
Probing Nonlinear Spin Dynamics in Canted Easy-Plane Antiferromagnets Using Spin-Rectification Effects
A El Kanj1, S Mantion1, I Boventer1
1Université Paris-Saclay, Laboratoire Albert Fert, CNRS, Thales, 91767 Palaiseau, France.
Abstract:
We investigate spin-rectification phenomena in canted antiferromagnets, closely connected to the family of altermagnetic materials. Our results show that excitation efficiency is significantly enhanced by the Dzyaloshinskii-Moriya interaction. Antiferromagnetic dynamics can be detected through spin-Hall magnetoresistance and bolometric effects, with an efficiency reaching up to mV/W. The rectified voltage is influenced by the symmetry of the exciting torques, detection mechanisms (continuous spin-pumping and spin-Hall magnetoresistance), and the antiferromagnetic crystalline axis. Under high pumping power, we observe a saturation effect related to Suhl-like spin-wave instabilities and a nonlinear redshift of the antiferromagnetic resonance. These findings open new avenues for studying nonlinear dynamics in antiferromagnetic and altermagnetic spintronic devices.
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