MgO thickness-induced spin reorientation transition in Co0.9Fe0.1/MgO/Co0.9Fe0.1 structure

[摘要] The magnetic anisotropy (MA) of Mo/Au/Co0.9Fe0.1/Au/MgO(0.7-3 nm)/Au/Co0.9Fe0.1/Au heterostructure has been investigated at room temperature as a function of MgO layer thickness (t(MgO)). Our studies show that while the MA of the top layer does not change its character upon variation of t(MgO), the uniaxial out-of-plane MA of the bottom one undergoes a spin reorientation transition at t(MgO) of about 0.8 nm, switching to the regime where the coexistence of in-and out-of-plane magnetization alignments is observed. The magnitudes of the magnetic anisotropy constants have been determined from ferromagnetic resonance and dc-magnetometry measurements. The origin of MA evolution has been attributed to a presence of an interlayer exchange coupling (IEC) between Co0.9Fe0.1 layers through the thin MgO film. (C) 2017 Elsevier B.V. All rights reserved.

[发布日期] 2017-12-15

[关键词] Spin reorientation transition;Perpendicular magnetic anisotropy;Ferromagnetic resonance;Magnetic tunnel junctions