Abstract
Various films of magnetic semiconductors EuO, EuS, EuSe, and EuTe have been studied by low-energy muon spin relaxation $(\text{LE-}\ensuremath{\mu}\text{SR})$ as well as by magnetization measurement techniques. $\text{LE-}\ensuremath{\mu}\text{SR}$ allows measurements of the distribution of magnetic field on the subnanometer scale unaccessible to traditional macroscopic techniques. A bound state of an electron around a positive muon---a magnetic polaron---is formed in the paramagnetic phase of Eu-based films up to room temperature. The local environment around the muon in the magnetic polaron is shown to be ferromagnetic.
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