The magnon of SrRuO3 single crystal film by Neutron Inelastic Scattering*

Low energy excitations such as magnon, plaron and phonon are primary properties tightly associated with unique physical phenomena of materials and can be probed by powerful inelastic neutron scattering usually in bulk crystal. In this study, we have used an inelastic neutron scattering on SrRuO3 thin films to investigate the magnon dispersion curve in this ferromagnetic system to better understand the underlying mechanisms. Inelastic scattering experiments were carried out in ANSTO SIKA and NIST SPINS. This is the first report to prove the existence of magnons in SrRuO2 system using an inelastic neutron scattering experiment on a thin film systems. We found that two magnon dispersion curves propagates along the [00l] direction and follows the quadratic (E ∝ Q2) relations which may be attributed to the tetragonal crystal structure of the films. One magnon has no gap and the other has a gap of 0.56meV at the zone center which correspond to J =1.55 and 1.76meV, respectively.