Subterahertz spin pumping from an insulating antiferromagnet

Abstract

Spin-transfer torque and spin Hall effects combined with their reciprocal phenomena, spin pumping and inverse spin Hall effects (ISHEs), enable the reading and control of magnetic moments in spintronics. The direct observation of these effects remains elusive in antiferromagnetic-based devices. We report subterahertz spin pumping at the interface of the uniaxial insulating antiferromagnet manganese difluoride and platinum. The measured ISHE voltage arising from spin-charge conversion in the platinum layer depends on the chirality of the dynamical modes of the antiferromagnet, which is selectively excited and modulated by the handedness of the circularly polarized subterahertz irradiation. Our results open the door to the controlled generation of coherent, pure spin currents at terahertz frequencies.

Spin-orbit coupling and linear crossings of dipolar magnons in van der Waals antiferromagnets

“…Due to their low energy, these magnon states would have a large thermal population and are relevant even at low temperature. The sub-THz range of their frequencies, although much higher than the usual ferromagnetic resonance, is already achievable by current techniques [10,11,14,15], which supports their observation and potential applications in magnonics. In the K and K valleys, four nodal points are found in each valley.…”

“…The dynamics and transport properties of magnons, quanta of collective spin waves, have recently received intensive investigations in traditional bulk antiferromagnets [7][8][9][10][11]. One outstanding property of the magnons in antiferromagnets is the coexistence of different spin-polarized modes, which supplies more interesting physics due to the additional spin degrees of freedom [12,13], compared to magnons in ferromagnets.…”

Spin Dynamics in Antiferromagnets with Domain Walls and Disclinations

“…The effects of the direction switching of the vector L under the spincurrent action [47,48] were observed. The resonant spin pumping using an AFM as an active element was performed at frequencies up to 200 GHz [49] and up to 450 GHz [50].…”

“…Because of the condition p ‖ e, the EA AFM must lie in the film plane in this case. This geometry was used in works [49,50] while studying the spin pumping with the help of AFM. Assuming e ‖ e , we obtain that e 1 ‖ e , e 2 ‖ e , j sp ∝ e sin cos cos , and the alternating electric current, which is directed perpendicularly to j sp , flows in the direction of the -axis, i.e.…”

Детектирование Терагерцевых Электромагнитных Волн С Помощью Проводящих Антиферромагнетиков

“…Чувствительность к переменному ТHz-сигналу предложенной структуры детектора сравнима с чувствительностью современных детекторов, в частности, на основе графена [18]. Эксперименты [19,20] по спиновой накачке антиферромагнетиков, выполненные за последние годы, подтверждают резонансный характер детек-тирования ТHz-сигналов за счет обратного спинового эффекта Холла в структурах, содержащих АФМ.…”