Perpendicular Magnetic Anisotropy in CoFeB/Pd Bilayers

Author

Fowley, Ciarán ; Decorde, Nicolas ; Oguz, Kaan ; Rode, Karsten ; Kurt, Huseyin ; Coey, J.M.D.

Author_Institution

Sch. of Phys., Trinity Coll., Dublin, Ireland

Volume

46

Issue

6

fYear

2010

fDate

6/1/2010 12:00:00 AM

Firstpage

2116

Lastpage

2118

Abstract

Perpendicular magnetic anisotropy is observed in ultrathin (~ 0.6 nm) amorphous Co₄₀Fe₄₀B₂₀ when sputtered on an MgO (001) buffer layer and capped with Pd. The layers are superparamagnetic with a blocking temperature of ~ 230 K, below which they show an exponential temperature dependence of coercivity. Perpendicular magnetic anisotropy is observed in the as-deposited state and the mechanism is different from that of CoFeB/Pt, which requires postannealing. These ultrathin layers could be a model system for studies of electric field effects on magnetic anisotropy.

Keywords

cobalt compounds; coercive force; iron compounds; magnesium compounds; magnetic multilayers; palladium; perpendicular magnetic anisotropy; sputter deposition; superparamagnetism; Si-SiO-MgO-Co₄₀Fe₄₀B₂₀-Pd; as-deposited state; bilayers; blocking temperature; coercivity; electric field effects; exponential temperature dependence; perpendicular magnetic anisotropy; post annealing; sputtering; superparamagnetic layers; ultrathin layers; Anisotropic magnetoresistance; Annealing; Buffer layers; Capacitors; Coercive force; Magnetic anisotropy; Magnetic films; Perpendicular magnetic anisotropy; Temperature dependence; Torque; Perpendicular magnetic anisotropy (PMA); thin-film capacitors;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2010.2044374

Filename

5467429