  We have investigated the magnetic transition and magnetic structure of
triple-layered ruthenate Sr4Ru3O10 directly using neutron scattering
techniques. Only one ferromagnetic phase is observed, and previously proposed
antiferromagnetic phase transitions are ruled out. The complex anisotropic
magnetotransport, magnetization and in-plane metamagnetic behaviors of this
quasi two-dimensional (2D) material are most likely due to magnetic domain
processes with strong magnetocrystalline anisotropy and a strongly anisotropic
demagnetization factor.
