Spin Seebeck mechanical force

Abstract

Electric current has been used to send electricity to far distant places. On the other hand, spin current, a flow of electron spin, can in principle also send angular momentum to distant places. In a magnet, there is a universal spin carrier called a spin wave, a wave-type excitation of magnetization. Since spin waves exhibit a long propagation length, it should be able to send angular momentum that can generate torque and force at a distant place: a new function of magnets. Here we observe mechanical angular momentum transmission and force generation due to spin waves injected into Y 3 Fe 5 O 12 by the spin-Seebeck effect. The spin-wave current, transmitted through a Y 3 Fe 5 O 12 micro cantilever, was found to create a mechanical force on the cantilever as a non-local reaction of the spin-Seebeck effect. Spin-wave current can be generated remotely even in open circuits, and it can be used to drive micro mechanical devices.

Angular momentum conservation and phonon spin in magnetic insulators

“…Depending on the driving protocol, the transient Einstein-de Haas dynamics can involve a change in the sense of rotation. When the system is not levitated but fixed, e.g., on a substrate, the torques exerted by the magnon and phonon spins on the sample are in principle measurable [51][52][53]. Brillouin light scattering [16] can resolve the phonon spin; our prediction of a momentum imbalance between the two circularly polarized phonon modes should therefore also be experimentally accessible.…”

“…Our treatment of angular momentum transfer in spinlattice interactions should be useful in the study of a variety of problems. Of particular interest would be the application to the magnetic nanosystems like cantilevers [51][52][53] and nanoparticles in polymer cavities [54] or levitated in traps [22][23][24][25]. It could also be extended to study the role of the phonon spin in transport phenomena like the spin Seebeck effect [1].…”

Electrical generation and detection of spin waves in polycrystalline YIG/Pt grown on silicon wafers

“…Since the spin mixing conductance  g eff governs various spin-dependent phenomena such as spin pumping, SMR and spin Seebeck effect [30][31][32], it is essential to experimentally determine  g eff of polycrystalline YIG/Pt films grown on the silicon substrate. For our Si/SiO 2 /YIG/Pt samples, the Pt layer was finally deposited at room temperature after the post-annealing of polycrystalline YIG film.…”

Yttrium Iron Garnet Thickness Influence on the Spin Pumping in the Bulk Acoustic Wave Resonator

“…With the development of new materials and structures, as well as the development of experimental techniques, various aspects of the magnon-phonon interaction acquired a new sense and are currently being actively explored in microwave spintronics, streintronics, spincaloritronics and magnonics [1][2][3][4][5][6][7][8]. The piezoelectric generation of acoustically driven spin waves (ADSW) in piezoelectric /magnetoelastic structures is promising for use in low power consumption devices free from ohmic losses [7][8][9][10][11][12].…”