Demonstrating multibit magnetic memory in the Fe8 high-spin molecule by muon spin rotation

We develop a method to detect the quantum nature of high-spin molecules using muon spin rotation and a three-step field cycle ending always with the same field. We use this method to demonstrate that the ${\mathrm{Fe}}_{8}$ molecule can remember six (possibly eight) different histories (bits). A wide range of fields can be used to write a particular bit, and the information is stored in discrete states. Therefore, ${\mathrm{Fe}}_{8}$ can be used as a model compound for multibit magnetic memory. Our experiment also paves the way for magnetic quantum tunneling detection in films.