Title :
Perpendicular magnetic anisotropy for CoFeBZr/MgO
Author :
Kil, J. ; Suh, D. ; Park, W. ; Bae, G. ; Kim, G. ; Noh, S. ; Choi, W.
Author_Institution :
Hanyang Univ., Seoul, South Korea
Abstract :
This study investigates the effects of Zr insertion in CoFeB alloy on the perpendicular magnetic anisotropy of a magnetic tunnel junction composed of Ta/CoFeBZr/MgO. A perpendicular magnetic anisotropy with sharp switching characteristics is observed with magnetic field annealing at 250°C and 3 T for 30 min. Useful coefficients representing magnetic properties are extracted from the magnetization hysteresis loop. Ferromagnetic resonance measurements are also performed at 9.43 GHz to evaluate the damping constant. It is shown that Zr insertion expands the magnetic volume for surface perpendicular magnetic anisotropy according to the large thickness margin of CoFeBZr.
Keywords :
alloying additions; boron alloys; cobalt alloys; ferromagnetic materials; ferromagnetic resonance; iron alloys; magnesium compounds; magnetic annealing; magnetic hysteresis; magnetic multilayers; magnetic switching; magnetic tunnelling; perpendicular magnetic anisotropy; surface magnetism; tantalum; zirconium alloys; Ta-CoFeBZr-MgO; damping constant; ferromagnetic resonance; frequency 9.43 GHz; magnetic field annealing; magnetic flux density 3 T; magnetic tunnel junction; magnetic volume; magnetization hysteresis loop; surface perpendicular magnetic anisotropy; switching characteristics; temperature 250 degC; time 30 min; Anisotropic magnetoresistance; Damping; Magnetic resonance; Magnetic tunneling; Magnetization; Perpendicular magnetic anisotropy; Zirconium;
Conference_Titel :
Magnetics Conference (INTERMAG), 2015 IEEE
Conference_Location :
Beijing
Print_ISBN :
978-1-4799-7321-7
DOI :
10.1109/INTMAG.2015.7156730
