Perpendicular Anisotropy and Damping of MBE-grown MgO/Fe/Au(001) and Au/Fe/Au(001) Trilayers

Abstract

MgO/Fe/Au(001) and Au/Fe/Au(001) trilayers with Fe layer thickness from 0.4 to 1.2 nm were grown by the molecular beam epitaxy (MBE) method, and the perpendicular magnetic anisotropy (PMA) and magnetization dynamics of the trilayers were studied. The MgO/Fe/Au trilayer exhibited a slightly larger interface anisotropy than the Au/Fe/Au trilayer, and the effective anisotropy of both trilayers decreased with increasing Fe thickness due to the shape anisotropy. The g-factor of both trilayers decreased from the bulk value with decreasing Fe thickness, and MgO/Fe/Au showed a slightly lower g-factor than Au/Fe/Au. The effective damping constant a of both trilayers increased with decreasing Fe thickness due to the effect of spin pumping, and interestingly the MgO/Fe/Au trilayers showed large damping compared with the Au/Fe/Au ones. These results suggest that the broken inversion symmetry in MgO/Fe/Au leads to a large PMA and damping through Rashba spin-orbit coupling.

Enhancing the magnetic response on polycrystalline nanoframes through mechanical deformation

“…The magnetic material used to simulate the magnetic frame correspond to Fe. In this case, the magnetic parameters are the magnetization saturation and the exchange stiffness 49 . Also, a Gilbert damping factor of 0.5 was considered.…”

Laser Induced Spin Current in GdFeCo/Cu/FeCo Trilayers Triggered by Ultrashort Pulsed Laser

“…Thus, we have measured w of the GdFeCo under the applied field Hext of 4-14 kOe along q H = 40˚. The Hext dependence of w was fitted with Shul's equation 28) , and the detail of the fitting was described in our previous paper 29) . Table A1 summarizes Hkeff and g-factor of the GdFeCo for GdFeCo / Cu / FeCo trilayers.…”

Generation and routing of nanoscale droplet solitons without compensation of magnetic damping

“…The lattice strains induced in the Fe layer by a thick MgO substrate are set equal to u xx = u yy = 3.9% [23]. In the numerical calculations, we also use the exchange constant A ex = 20 pJ m −1 [22], Gilbert damping parameter α = 0.0025 [27], anisotropy coefficients K 1 = 48 kJ m −3 [22] and [28], and elastic stiffnesses c 11 = 2.42 × 10 11 N m −2 and c 12 = 1.465 × 10 11 N m −2 [30]. The MgO thickness is set equal to the value of 2 nm, at which the influence of the voltage-induced tunnel current through MgO on the magnetization dynamics can be neglected.…”