Title :
Mechanism of higher order contributions in interface anisotropy of thin films: FeCo/MgO case
Author :
Barker, J. ; Kalitsov, A. ; Singh, A. ; Mryasov, O.N. ; Okatov, S.
Author_Institution :
Inst. for Mater. Res., Tohoku Univ., Sendai, Japan
Abstract :
Current state of the art perpendicular magnetic tunnel junctions (pMTJs) rely upon a large uniaxial interface anisotropy to overcome the demagnetizing field. Experimental measurements have found that as well as the expected K1sin2(θ) anisotropy energy, a higher order K2sin4(θ) contribution is present. In thin films with bulk anisotropies K2 can arise from a distribution of the anisotropy axes. In the course of constructing a model of FeCo/MgO we unexpectedly found a K2sin4(θ) dependence in the free energy, even without any disorder in the anisotropy axes or higher order magneto-crystalline anisotropy.
Keywords :
cobalt alloys; interface magnetism; iron alloys; magnesium compounds; magnetic anisotropy; magnetic thin films; FeCo-MgO; free energy; perpendicular magnetic tunnel junctions; thin films; uniaxial interface anisotropy; Anisotropic magnetoresistance; Films; Magnetic tunneling; Magnetization; Monte Carlo methods; Perpendicular magnetic anisotropy;
Conference_Titel :
Magnetics Conference (INTERMAG), 2015 IEEE
Conference_Location :
Beijing
Print_ISBN :
978-1-4799-7321-7
DOI :
10.1109/INTMAG.2015.7157633
