Title :
CoFeB Thickness Dependence of Thermal Stability Factor in CoFeB/MgO Perpendicular Magnetic Tunnel Junctions
Author :
Sato, H. ; Yamanouchi, M. ; Miura, K. ; Ikeda, S. ; Koizumi, R. ; Matsukura, F. ; Ohno, H.
Author_Institution :
Center for Spintronics Integrated Syst., Tohoku Univ., Sendai, Japan
fDate :
7/4/1905 12:00:00 AM
Abstract :
Thermal stability factor Δ of the recording layer was studied in perpendicular anisotropy CoFeB/MgO magnetic tunnel junctions (p-MTJs) with various CoFeB recording layer thicknesses and junction sizes. In all series of p-MTJs with different thicknesses, Δ is virtually independent of the junction sizes of 48-81 nm in diameter. The values of Δ increase linearly as the recording layer thickness increases. The slope of the linear fit is explained well by a model based on nucleation-type magnetization reversal.
Keywords :
cobalt compounds; iron compounds; magnesium compounds; magnetic tunnelling; magnetisation reversal; perpendicular magnetic anisotropy; CoFeB recording layer thickness; CoFeB-MgO; junction sizes; nucleation-type magnetization reversal; perpendicular anisotropy; perpendicular magnetic tunnel junctions; thermal stability factor; thickness dependence; Junctions; Magnetic recording; Magnetic tunneling; Perpendicular magnetic anisotropy; Switches; Thermal stability; Spin electronics; magnetic random access memory; magnetic tunnel junctions (MTJs);
Journal_Title :
Magnetics Letters, IEEE
DOI :
10.1109/LMAG.2012.2190722
