Embedded Fe Nanoparticles in the MgO Layer of CoFeB/MgO/CoFeB Perpendicular Magnetic Tunnel Junctions

Author

Lin-Xiu Ye ; Ching-Ming Lee ; Chui-Xiang Chiou ; Yang-Hua Chang ; Wen-Jauh Chen ; Te-Ho Wu

Author_Institution

Taiwan SPIN Res. Center, Nat. Yunlin Univ. of Sci. & Technol., Douliou, Taiwan

Volume

50

Issue

11

fYear

2014

fDate

Nov. 2014

Firstpage

1

Lastpage

3

Abstract

In this paper, we report the electric and magnetic effects after inserting Fe nanoparticles into the MgO layer of a Ta(25)/Co₂₀Fe₆₀B₂₀(1.3)/MgO(1)/Fe(x)/MgO(1)/Co₄₀Fe₄₀B₂₀(2.2)/Ta(5) structure. The samples were annealed at 300 °C without external magnetic field. Temperature dependence of resistivity and the anomalous Hall effect were used to infer the morphology of the Fe layer. With the addition of Fe nanoparticles, the optimal tunnel magnetoresistance ratio can be increased by up to 111.2%.

Keywords

Hall effect; annealing; boron alloys; cobalt alloys; iron alloys; magnesium compounds; nanoparticles; perpendicular magnetic anisotropy; tunnelling magnetoresistance; CoFeB-MgO-CoFeB; annealing; anomalous Hall effect; embedded iron nanoparticles; perpendicular magnetic anisotropy; perpendicular magnetic tunnel junctions; resistivity; temperature 300 degC; tunnel magnetoresistance ratio; Iron; Junctions; Magnetic tunneling; Nanoparticles; Perpendicular magnetic anisotropy; Temperature measurement; Tunneling magnetoresistance; Magnetic tunnel junctions (MTJs); perpendicular magnetic anisotropy (PMA);

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2014.2325399

Filename

6971305