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.

引用

页数：3

共 50 条

[31] Soft X-ray magnetic circular dichroism study of uranium monochalcogenides at uranium N4,5 absorption edges
Okane, Tetsuo
Takeda, Yukiharu
Okamoto, Jun
Mamiya, Kazutoshi
Ohkchi, Takuo
Fujimori, Shin-ichi
Saitoh, Yuji
Yamagami, Hiroshi
Fujimori, Atsushi
Ochiai, Akira
Tanaka, Arata
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 2008, 77 (02)
[32] X-ray magnetic circular dichroism - a universal tool for magnetic investigations
Goering, E
Will, J
Geissler, J
Justen, M
Weigand, F
Schuetz, G
JOURNAL OF ALLOYS AND COMPOUNDS, 2001, 328 (1-2) : 14 - 19
[33] Observation of magnetic moments at the interface region in magnetic tunnel junctions using depth-resolved x-ray magnetic circular dichroism
Tsunegi, S.
Sakuraba, Y.
Amemiya, K.
Sakamaki, M.
Ozawa, E.
Sakuma, A.
Takanashi, K.
Ando, Y.
PHYSICAL REVIEW B, 2012, 85 (18)
[34] X-ray magnetic circular dichroism studies in Ce(Fe1-xCox)2
Mizumaki, M
Yoshii, K
Watanabe, Y
Nanao, S
JOURNAL OF ALLOYS AND COMPOUNDS, 2006, 408 : 737 - 740
[35] X-Ray Absorption and Magnetic Circular Dichroism Studies of Co2 FeAl in Magnetic Tunnel Junctions
Ebke, Daniel
Kugler, Zoe
Thomas, Patrick
Schebaum, Oliver
Schaefers, Markus
Nissen, Dennis
Schmalhorst, Jan
Huetten, Andreas
Arenholz, Elke
Thomas, Andy
IEEE TRANSACTIONS ON MAGNETICS, 2010, 46 (06) : 1925 - 1928
[36] X-ray magnetic circular dichroism in iron chalcogenides Fe1-xS: First-principles calculations
Antonov, V. N.
Bekenov, L. V.
Shpak, A. P.
Germash, L. P.
Yaresko, A. N.
Jepsen, O.
JOURNAL OF APPLIED PHYSICS, 2009, 106 (12)
[37] MAGNETIC CIRCULAR-DICHROISM IN CORE X-RAY ABSORPTION-SPECTRA OF RARE-EARTHS
IMADA, S
JO, T
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 1990, 59 (09) : 3358 - 3373
[38] X-ray magnetic circular dichroism at the K-edge and proximity effects in Fe/Cu multilayers
Hirai, K
PHYSICA B-CONDENSED MATTER, 2004, 345 (1-4) : 209 - 212
[39] Cerium oxidation state in ceria nanoparticles studied with X-ray photoelectron spectroscopy and absorption near edge spectroscopy
Zhang, F
Wang, P
Koberstein, J
Khalid, S
Chan, SW
SURFACE SCIENCE, 2004, 563 (1-3) : 74 - 82
[40] A compact molecular-beam epitaxy apparatus for in situ soft X-ray magnetic circular dichroism experiments
Koide, T
Shidara, T
Nakajima, N
Miyauchi, H
Fukutani, H
JOURNAL OF SYNCHROTRON RADIATION, 1998, 5 : 1038 - 1040

← 1 2 3 4 5 →