Roldán-Molina A, Nunez Alvaro S, Duine R A
Centro para el Desarrollo de la Nanociencia y la Nanotecnología, CEDENNA, Avenida Ecuador 3493, Santiago 9170124, Chile.
Departamento de Física, Facultad de Ciencias Físicas y Matemáticas, Universidad de Chile, Casilla 487-3, Santiago, Chile.
Phys Rev Lett. 2017 Feb 10;118(6):061301. doi: 10.1103/PhysRevLett.118.061301. Epub 2017 Feb 8.
We show that the interaction between the spin-polarized current and the magnetization dynamics can be used to implement black-hole and white-hole horizons for magnons-the quanta of oscillations in the magnetization direction in magnets. We consider three different systems: easy-plane ferromagnetic metals, isotropic antiferromagnetic metals, and easy-plane magnetic insulators. Based on available experimental data, we estimate that the Hawking temperature can be as large as 1 K. We comment on the implications of magnonic horizons for spin-wave scattering and transport experiments, and for magnon entanglement.