  The spin Hall magnetoresistance (SMR) allows to investigate the magnetic
textures of magnetically ordered insulators in heterostructures with normal
metals by magnetotransport experiments. We here report the observation of the
SMR in in-situ prepared ferromagnetic EuO/W thin film bilayers with
magnetically and chemically well-defined interfaces. We characterize the
magnetoresistance effects utilizing angle-dependent and field-dependent
magnetotransport measurements as a function of temperature. Applying the
established SMR model, we derive and quantify the real and imaginary parts of
the complex spin mixing interface conductance. We find that the imaginary part
is by one order of magnitude larger than the real part. Both decrease with
increasing temperature. This reduction is in agreement with thermal
fluctuations in the ferromagnet.
