Magnetic remanence in single atoms
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A permanent magnet retains a substantial fraction of its saturation magnetization in the absence of an external magnetic field. Realizing magnetic remanence in a single atom allows for storing and processing information in the smallest unit of matter. We show that individual holmium (Ho) atoms adsorbed on ultrathin MgO(100) layers on Ag(100) exhibit magnetic remanence up to a temperature of 30 kelvin and a relaxation time of 1500 seconds at 10 kelvin. This extraordinary stability is achieved by the realization of a symmetry-protected magnetic ground state and by decoupling the Ho spin from the underlying metal by a tunnel barrier.
Source:Science, 2016, 352, 6283, 318-321
- Electronic, transport and optical properties of nanostructured materials (RS-171033)
- Modeling and Numerical Simulations of Complex Many-Body Systems (RS-171017)
- Swiss National Science Foundation [200021-153404, 200020-157081, 200021-146715, PZ00P2 142474, IZ73Z0-152406], Swiss Competence Centre for Materials Science and Technology (CCMX), ETH Postdoctoral Fellowship [FEL-42 13-2], EPFL Fellows fellowship program - Marie Curie, FP7 grant