Bose-Einstein condensation of magnons under incoherent pumping

Probing of a parametrically pumped magnon gas with a non-resonant packet of traveling spin waves

The magnon gas created by spatially localized longitudinal parametric pumping in an yttrium-iron-garnet film is probed by a traveling packet of spin waves non-resonant with the pumping field. The analysis of the influence of the magnon gas on the amplitude and phase of the propagating spin waves allows to determine characteristic properties of the parametrically pumped magnon gas. A simple theoretical model is proposed from which the magnon density in the pumping region is calculated.

Spin pumping by parametrically excited exchange magnons

We experimentally show that exchange magnons can be detected using a combination of spin pumping and inverse spin-Hall effect (iSHE) proving its wavelength integrating capability down to the sub-micrometer scale. The magnons were injected in a ferrimagnetic yttrium iron garnet film by parametric pumping and the iSHE-induced voltage was detected in an attached Pt layer. The role of the density, wavelength, and spatial localization of the magnons for the spin pumping efficiency is revealed. This study opens the field of the magnon-based information processing to magnons with nano-scale wavelengt…

铁磁体–共面超导谐振器杂化系统中由磁振子–极化激元驱动的自旋泵浦

Spin pumping driven by magnon-polaritons in a ferromagnet-coplanar superconducting resonator hybrid system

该研究在1.4 K的铁磁体–共面超导谐振器杂化系统中，利用逆自旋霍尔效应电学探测磁振子–光子强耦合驱动的自旋泵浦，并揭示耦合强度随微波功率增强而降低及超导谐振器的阈值非线性。

Cross-sublattice Spin Pumping and Magnon Level Attraction in van der Waals Antiferromagnets

We theoretically study spin pumping from a layered van der Waals antiferromagnet in its canted ground state into an adjacent normal metal. We find that the resulting dc spin pumping current bears contributions along all spin directions. Our analysis allows for detecting intra- and cross-sublattice spin-mixing conductances via measuring the two in-plane spin current components. We further show that sublattice symmetry-breaking Gilbert damping can be realized via interface engineering and induces a dissipative coupling between the optical and acoustic magnon modes. This realizes magnon level att…

Magnons Parametric Pumping in Bulk Acoustic Waves Resonator

We report on the experimental observation of excitation and detection of parametric spin waves and spin currents in the bulk acoustic wave resonator. The hybrid resonator consists of ZnO piezoelectric film, yttrium iron garnet (YIG) films on gallium gadolinium garnet substrate, and a heavy metal Pt layer. Shear bulk acoustic waves are electrically excited in the ZnO layer due to piezoeffect at the resonant frequencies of the resonator. The magnetoelastic interaction in the YIG film emerges magnons (spin waves) excitation by acoustic waves either on resonator's eigenfrequencies or the half-valu…

通过驱动磁振子系统中的低频泵浦实现共振激发

Resonant excitations via low frequency pumping in driven magnon systems

该研究利用弗洛凯理论，通过微波泵浦分析铁磁磁振子的共振激发，关注低于磁振子能量的驱动频率，建立理论框架预测共振区域等，与模拟比较，还能估计阈值振幅，实现低频驱动下的有针对性激发。