Fe diffusion, oxidation, and reduction at the CoFeB/MgO interface studied by soft x-ray absorption spectroscopy and magnetic circular dichroism

被引：38
|
作者：
Hindmarch, A. T. [1 ]
Dempsey, K. J. [1 ]
Ciudad, D. [1 ]
Negusse, E. [2 ]
Arena, D. A. [3 ]
Marrows, C. H. [1 ]
机构：
[1] Univ Leeds, Sch Phys & Astron, Leeds LS2 9JT, W Yorkshire, England
[2] Montana State Univ, Dept Phys, Bozeman, MT 59717 USA
[3] Brookhaven Natl Lab, Natl Synchrotron Light Source, Upton, NY 11973 USA
来源：
APPLIED PHYSICS LETTERS | 2010年 / 96卷 / 09期
基金：
英国工程与自然科学研究理事会;
关键词：
cobalt compounds; diffusion; ferromagnetic materials; interface magnetism; iron compounds; magnesium compounds; magnetic annealing; magnetic circular dichroism; magnetic tunnelling; magnetisation; oxidation; reduction (chemical); X-ray absorption spectra; ROOM-TEMPERATURE; TUNNEL-JUNCTIONS; MAGNETORESISTANCE; BARRIERS;
D O I：
10.1063/1.3332576
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
We have studied the effect of annealing on the interface magnetization in a CoFeB/MgO structure which models the lower electrode in a magnetic tunnel junction device. We find that MgO deposition causes Fe to diffuse toward the CoFeB/MgO interface, where it preferentially bonds with oxygen to form a Fe-O-rich interfacial region with reduced magnetization. After annealing at 375 degrees C the compositional inhomogeneity remains; Fe is reduced back to a ferromagnetic metallic state and the full interfacial magnetization is regained.
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页数：3
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