Electric field effects on magnetocrystalline anisotropy in ferromagnetic Fe monolayers

Strong perpendicular magnetic anisotropy energy density at Fe alloy/HfO2 interfaces

“…[5][6][7][8] At present, the only viable FM/oxide combination that yields the strong PMA and low damping required for practical devices is Fe 80-x Co x B 20 (FeCoB)/MgO where the PMA originates from the strong spin-orbit interaction in the hybridized 3d Fe-2p O bonding at the FeCoB/MgO interface. 9,10 However, obtaining significant PMA in the previous work requires an annealing step [1][2][3][4] that can compromise the layers in the magnetic heterostructure due, for example, to materials intermixing at the interface or to longer distance diffusion.…”

Atomic-Layer Alignment Tuning for Giant Perpendicular Magnetocrystalline Anisotropy of3dTransition-Metal Thin Films

“…However, at surfaces and interfaces, the MA energy reaches as much as 10 −1 meV, induced by symmetry lowering and orbital localization at surfaces/interfaces. Remarkably, recent findings of the PMA in Fe/MgO(001) [16,17] Calculations were performed based on generalized gradient approximation (GGA) [22] by using the FLAPW method with a single slab geometry, in which the core states are treated fully relativistically and the valence states are treated semi-relativistically (SRA),…”

Growth and Properties of Magnetic Thin Films using Magnetron Sputtering Deposition

“…5.5. The PMA energy density K at t MgO = 2.0 nm is calculated to be 2 × 10 6 erg/cm 3 , comparable to that of other PMA systems such as CoFeB/MgO [84] and Co/Pd perpendicular multilayers [85], and can satisfy the high thermal stability for devices with lower than 50 nm dimension. In order to determine the Gilbert damping constant in the films ferromagnetic resonance (FMR) spectra were recorded using a broadband coplanar waveguide field-swept FMR setup, with an upper frequency limit of about 50 GHz.…”