Magnetic Bragg peak enhancement under ultrasound injection

Ultrasound injection effect on a magnetic Bragg peak of yttrium iron garnet has been studied by quasielastic neutron scattering. The is vastly enhanced with decreasing temperature. energy width increases proportionally to the square root sample temperature increase induced ultrasound injection. Based liquid model, estimated effective mass becomes light when domain walls are removed under field. Because lattice vibration, enhancement expected closely relate spin-lattice coupling. sharp drop observed above 100 K for longitudinal mode, indicating degradation It consistent suppression spin Seebeck rises K, demonstrating coupling as mechanism.