Phys.org July 19, 2024 Rare-earth elements with strong magneto-crystalline anisotropy (MCA) are important ingredients for magnetic devices. Control of their localized 4f magnetic moments and anisotropy is one major challenge in ultrafast spin physics. An international team of researchers (Germany, Czech Republic, France, Sweden) used time-resolved x-ray absorption and resonant inelastic scattering experiments to show that for terbium that 4f-electronic excitations out of the ground-state multiplet occurred after optical pumping. These excitations were driven by inelastic 5d-4f-electron scattering, altering the 4f-orbital state and consequently the MCA with important implications for magnetization dynamics in 4f-metals and more general for the excitation […]
Tag Archives: Magnetic devices
From a five-layer graphene sandwich, a rare electronic state emerges
Science Daily October 18, 2023 Multiferroics have multifunctional electrical and magnetic device applications. Two-dimensional materials with honeycomb lattices offer opportunities to engineer unconventional multiferroicity. Orbital multiferroics could offer strong valley–magnetic couplings and large responses to external fields—enabling device applications such as multiple-state memory elements and electric control of the valley and magnetic states. An international team of researchers (USA – MIT, Harvard University, Japan) has shown orbital multiferroicity in Penta layer rhombohedral graphene. They observed anomalous Hall signals Rxy with an exceptionally large Hall angle and orbital magnetic hysteresis at hole doping. There were four such states with different valley […]