Daniel C. Ralph

Jul 15, 2024 | nature.com | Yongjian Tang |Yuejie Zhang |Wanjun Jiang |Qinghua Zhang |Lin Gu |Pu Yu | +5 more

AbstractMagnons, bosonic quasiparticles carrying angular momentum, can flow through insulators for information transmission with minimal power dissipation. However, it remains challenging to develop a magnon-based logic due to the lack of efficient electrical manipulation of magnon transport. Here we show the electric excitation and control of multiferroic magnon modes in a spin-source/multiferroic/ferromagnet structure.

Apr 26, 2023 | nature.com | Hai Zhong |Di Yi |Yuri Suzuki |Daniel C. Ralph |Yuejie Zhang |Jiamian Hu

AbstractWe present room-temperature measurements of magnon spin diffusion in epitaxial ferrimagnetic insulator MgAl0.5Fe1.5O4 (MAFO) thin films near zero applied magnetic field where the sample forms a multi-domain state. Due to a weak uniaxial magnetic anisotropy, the domains are separated primarily by 180° domain walls.

Mar 30, 2023 | nature.com | Lijun Zhu |Daniel C. Ralph

AbstractSpin-orbit torques (SOTs) have been widely understood as an interfacial transfer of spin that is independent of the bulk properties of the magnetic layer. Here, we report that SOTs acting on ferrimagnetic FexTb1-x layers decrease and vanish upon approaching the magnetic compensation point because the rate of spin transfer to the magnetization becomes much slower than the rate of spin relaxation into the crystal lattice due to spin-orbit scattering.