Phys.org April 23, 2024 An international team of researchers (Japan, Australia) examined magnon spin currents in the ferrimagnetic garnet Tb3Fe5O12 with 4f electrons through the spin-Seebeck effect and neutron scattering measurements. The compound showed a magnetic compensation, where the spin-Seebeck signal reversed above and below K. Unpolarized neutron scattering unveiled two major magnon branches with finite energy gaps which were well explained in the framework of spin-wave theory. Their temperature dependencies and the direction of the precession motion of magnetic moments defined using polarized neutrons explained the reversal at and decay of the spin-Seebeck signals at low temperatures. According to […]
Tag Archives: Spin-current
Study unveils dependence of spin memory loss in a variety of interfaces
Phys.org March 24, 2020 The discontinuity of a spin-current through an interface caused by spin-orbit coupling is characterized by the spin memory loss (SML). An international team of researchers (the Netherlands, Germany, UK, China) used first-principles scattering theory and a recently developed local current scheme to study the SML for Au/Pt, Au/Pd, Py/Pt and Co/Pt interfaces. They found a minimal temperature dependence for nonmagnetic interfaces and a strong dependence for interfaces involving ferromagnets that they attributed to the spin disorder. The SML is larger for Co/Pt than Py/Pt because the interface is more abrupt. Lattice mismatch and interface alloying strongly […]