The duality between electric and magnetic dipoles inspires recent comparisons between ferronics and magnonics.Here we predict surface polarization waves or“ferrons”in ferroelectric insulators,taking the long-range d...The duality between electric and magnetic dipoles inspires recent comparisons between ferronics and magnonics.Here we predict surface polarization waves or“ferrons”in ferroelectric insulators,taking the long-range dipolar interaction into account.We predict properties that are strikingly different from the magnetic counterpart,i.e.the surface Damon-Eshbach magnons in ferromagnets.The dipolar interaction pushes the ferron branch with locked circular polarization and momentum to the ionic plasma frequency.The low-frequency modes are on the other hand in-plane polarized normal to their wave vectors.The strong anisotropy of the lower branch renders directional emissions of electric polarization and chiral near fields when activated by a focused laser beam,allowing optical routing in ferroelectric devices.展开更多
We report a theory of thermal spin pumping into proximity magnets under a transverse-bias-driven heat flow of magnons in magnetic films when the dipolar coupling to the magnetic gate is tuned to be “chiral”. While t...We report a theory of thermal spin pumping into proximity magnets under a transverse-bias-driven heat flow of magnons in magnetic films when the dipolar coupling to the magnetic gate is tuned to be “chiral”. While there is no rectification of the magnon current in the film, we predict that chirality diverts a large percentage(50% for perfect chirality) of it into the gate. This transverse thermal spin pumping effect can be controlled by rotating the film magnetization and may help manage the heat flow in future magnonic circuits.展开更多
基金financially supported by the National Natural Science Foundation of China(Grant No.0214012051)the startup grant of Huazhong University of Science and Technology(Grants Nos.3004012185,3004012198)+5 种基金the financial support by JSPS KAKENHI(Grant Nos.19H00645,22H04965)financially supported in Brazil by Conselho Nacional de Desenvolvimento Científico e Tecnológico(CNPq)Coordenac ao de Aperfeicoamento de Pessoal de Nível Superior(CAPES)Financiadora de Estudos e Projetos(FINEP)Fundac ao de AmparoáCiencia e Tecnologia do Estado de Pernambuco(FACEPE)in Chile by Fondo Nacional de Desarrollo Científico y Tecnológico(FONDECYT)(Grant No.1210641)。
文摘The duality between electric and magnetic dipoles inspires recent comparisons between ferronics and magnonics.Here we predict surface polarization waves or“ferrons”in ferroelectric insulators,taking the long-range dipolar interaction into account.We predict properties that are strikingly different from the magnetic counterpart,i.e.the surface Damon-Eshbach magnons in ferromagnets.The dipolar interaction pushes the ferron branch with locked circular polarization and momentum to the ionic plasma frequency.The low-frequency modes are on the other hand in-plane polarized normal to their wave vectors.The strong anisotropy of the lower branch renders directional emissions of electric polarization and chiral near fields when activated by a focused laser beam,allowing optical routing in ferroelectric devices.
基金supported by the National Key Research and Development Program of China (Grant No. 2023YFA1406600)the National Natural Science Foundation of China (Grant No. 12374109)the startup grant of Huazhong University of Science and Technology, as well as JSPS KAKENHI (Grant Nos. 19H00645, and 22H04965)
文摘We report a theory of thermal spin pumping into proximity magnets under a transverse-bias-driven heat flow of magnons in magnetic films when the dipolar coupling to the magnetic gate is tuned to be “chiral”. While there is no rectification of the magnon current in the film, we predict that chirality diverts a large percentage(50% for perfect chirality) of it into the gate. This transverse thermal spin pumping effect can be controlled by rotating the film magnetization and may help manage the heat flow in future magnonic circuits.
