TITLE

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

AUTHOR(S)
Hindmarch, A. T.; Dempsey, K. J.; Ciudad, D.; Negusse, E.; Arena, D. A.; Marrows, C. H.
PUB. DATE
March 2010
SOURCE
Applied Physics Letters;3/1/2010, Vol. 96 Issue 9, p092501
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
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 °C the compositional inhomogeneity remains; Fe is reduced back to a ferromagnetic metallic state and the full interfacial magnetization is regained.
ACCESSION #
48429021

 

Related Articles

  • Element Specific Magnetometry Combining X-ray Circular with Linear Dichroism: Fundamentals and Applications. KOWALIK, I. A. // Acta Physica Polonica, A.;2015, Vol. 127 Issue 3, p831 

    This article gives an overview of the use of X-ray absorption spectroscopy to characterize the magnetic properties for technologically important, low dimensional magnetic materials. An overview is given both for the experimental hardware, the measurements and the analysis of the spectra. The...

  • X-ray absorption and x-ray magnetic circular dichroism studies on a monatomic bcc-Co(001) layer facing an amorphous Al–O tunnel barrier. Katayama, Toshikazu; Yuasa, Shinji; Saito, Shinji; Kurosaki, Yoshinari; Saito, Toshiaki; Kamino, Tomoyuki; Kobayashi, Kie; Suzuki, Yoshishige; Manaka, Hirotaka; Koide, Tsuneharu // Journal of Applied Physics;7/15/2006, Vol. 100 Issue 2, p023912 

    We studied the electronic states and magnetic moments of a bcc-Co(001) monatomic layer facing an amorphous Al–O tunneling barrier using x-ray absorption spectroscopy (XAS) and x-ray magnetic circular dichroism (XMCD) at the L2,3 core edges of Co. Both the XAS and XMCD measurements...

  • Mn L3,2 X-ray Absorption Spectroscopy And Magnetic Circular Dichroism In Ferromagnetic Ga1-xMnxP. Stone, P. R.; Scarpulla, M. A.; Farshchi, R.; Sharp, I. D.; Beeman, J. W.; Yu, K. M.; Arenholz, E.; Denlinger, J.; Haller, E. E.; Dubon, O. D. // AIP Conference Proceedings;2007, Vol. 893 Issue 1, p1177 

    We have measured the X-ray absorption (XAS) and X-ray magnetic circular dichroism (XMCD) at the Mn L3,2 edges in ferromagnetic Ga1-xMnxP films for 0.018<=x<=0.042. Large XMCD asymmetries at the L3 edge indicate significant spin-polarization of the density of states at the Fermi energy. The...

  • Magnetic circular dichroism of ferromagnetic Co2+-doped ZnO. Kittilstved, Kevin R.; Jialong Zhao; Liu, William K.; Bryan, J. Daniel; Schwartz, Dana A.; Gamelin, Daniel R. // Applied Physics Letters;8/7/2006, Vol. 89 Issue 6, p062510 

    Cobalt-doped ZnO (Co2+:ZnO) films were studied by magnetic circular dichroism (MCD) spectroscopy. A broad 300 K ferromagnetic MCD signal was observed between 1.4 and 4.0 eV after exposure of paramagnetic Co2+:ZnO films to zinc metal vapor, attributed to low-energy photoionization transitions...

  • Soft x-ray magnetic circular dichroism study of Cr tellurides. Yaji, Koichiro; Kimura, Akio; Koyama, Michie; Hirai, Chiyuki; Sato, Hitoshi; Shimada, Kenya; Tanaka, Arata; Taniguchi, Masaki // Journal of Applied Physics;5/15/2005, Vol. 97 Issue 10, p10N505 

    Ferromagnetic chromium tellurides Cr5Te6 (δ=0.17) and Cr2Te3 (δ=0.33) have been investigated by Cr 2p x-ray absorption spectroscopy and x-ray magnetic circular dichroism (XMCD). The observed XMCD spectra have been analyzed by means of a configuration-interaction cluster model calculation....

  • Mn K-Edge XMCD Study of the Mixed-Valence State of Mn-Based Molecular Nanomagnets. Subías, G.; García, J.; Sánchez, M. C. // AIP Conference Proceedings;2007, Vol. 882 Issue 1, p783 

    X-ray Magnetic Circular Dichroism (XMCD) measurements of the Mn12Ac and Mn4OAc molecular magnets compared with several manganites, such as LaMn0.5Ga0.5O3 (Mn3+ reference), LaMn0.5Ni0.5O3 (Mn4+ reference) and the magnetoresistive La0.67Ca0.33MnO3 are reported. The Mn K edge XAS and XMCD spectra...

  • Element Specific Versus Integral Structural and Magnetic Properties of Co:ZnO and Gd:GaN Probed with Hard X-ray Absorption Spectrocopy. Ney, Andreas // Materials (1996-1944);Jun2010, Vol. 3 Issue 6, p3565 

    Dilute magnetic semiconductors (DMS) are envisioned as sources of spin-polarized carriers for future semiconductor devices which simultaneously utilize spin and charge of the carriers. The hope of discovering a DMS with ferromagnetic order up to room temperature still motivates research on...

  • Magnetic circular dichroism in Co1-xPtx nanowire bundles at the Co L2,3 edges. Li, Wuxia; Zhang, Jun; Thompson, Jamie; Shen, Tiehan H.; Arenholz, Elke; Morton, Simon A.; Ellerby, Mark // Applied Physics Letters;9/24/2007, Vol. 91 Issue 13, p133111 

    Co1-xPtx nanowire arrays embedded in anodic aluminum oxide templates were fabricated by an electrochemical route. X-ray magnetic circular dichroism (XMCD) measurements were conducted at the Co L2,3 edges on samples with an array of nanowire bundles at the substrate surfaces. The ratios between...

  • Core hole polarization made easy. van der Laan, G. // Applied Physics A: Materials Science & Processing;1997, Vol. 65 Issue 2, p135 

    The strong core hole polarization induced by X-ray absorption is discussed. With a simple calculation it can be shown that the shape of the core hole in magnetic circular dichroism is strongly nonspherical when the valence band is spin polarized. The orbital polarization and the magnetic dipole...

Share

Read the Article

Courtesy of VIRGINIA BEACH PUBLIC LIBRARY AND SYSTEM

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics