Comparison of the magnetic properties of GeMn thin films through Mn L-edge x-ray absorption

Ahlers, S.; Stone, P. R.; Sircar, N.; Arenholz, E.; Dubon, O. D.; Bougeard, D.
October 2009
Applied Physics Letters;10/12/2009, Vol. 95 Issue 15, p151911
Academic Journal
X-ray absorption spectroscopy of epitaxial GeMn thin films reveals an experimentally indistinguishable electronic configuration of Mn atoms incorporated in Ge1-xMnx nanoclusters and in precipitates of the intermetallic compound Mn5Ge3, respectively. However, the average magnetic response of thin films containing Ge1-xMnx nanoclusters is lower than the response of films containing Mn5Ge3 precipitates. This reduced magnetic response of Ge1-xMnx nanoclusters is explained in terms of a fraction of Mn atoms being magnetically inactive due to antiferromagnetic coupling or the presence of structural disorder. A determination of the role of magnetically inactive Mn atoms in the self-assembly of the thermodynamically metastable Ge1-xMnx nanoclusters seems to be an essential ingredient for an enhanced control of this promising high Curie temperature magnetic semiconductor.


Related Articles

  • Near edge x-ray absorption fine structure study of aligned Ï€-bonded carbon structures in nitrogenated ta-C films. Roy, S. S.; McCann, R.; Papakonstantinou, P.; McLaughlin, J. A.; Kirkman, I. W.; Bhattacharyya, S.; Silva, S. R. P. // Journal of Applied Physics;2/15/2006, Vol. 99 Issue 4, p043511 

    Polarization dependent studies of near edge x-ray absorption fine structure (NEXAFS) show evidence for the presence of aligned π-bonded carbon structures and the formation of a nonplanar CN phase in tetrahedral amorphous nitrogenated carbon (ta-CN) films deposited at room temperature....

  • Al Thermal Diffusion in a-Si1-xCx:H Thin Film Studied by XAFS. Prado, R. J.; Fantini, M. C. A.; Carreño, M. N. P.; Pereyra, I.; Flank, A. M. // AIP Conference Proceedings;2007, Vol. 882 Issue 1, p529 

    In this work the local structure around the aluminium atoms, diffused by thermal annealing in a-SiC:H thin films was analyzed by x-ray absorption near edge structure (XANES), aiming to obtain information about the Al ordering after annealing. The thermal annealing of the films was performed in...

  • Electronic structure and magnetic properties of Al-doped Fe3O4 films studied by x-ray absorption and magnetic circular dichroism. Yang, C. K.; Chiou, J. W.; Tsai, H. M.; Pao, C. W.; Jan, J. C.; Ray, S. C.; Yeh, C. L.; Huang, K. C.; Hsueh, H. C.; Pong, W. F.; Tsai, M.-H.; Hsieh, H. H.; Lin, H. J.; Hou, T. Y.; Hsu, J. H. // Applied Physics Letters;2/7/2005, Vol. 86 Issue 6, p062504 

    The electronic structure and magnetic properties of Al-doped Fe3O4 films at various Al concentrations were investigated by Al and O K-edge x-ray absorption near-edge structure (XANES) and Fe L3,2-edge magnetic circular dichroism (MCD) measurements. The O K-edge XANES spectra reveal that the...

  • Preferable orientation of turbostratic BN basal planes from an x-ray absorption study. Zhou, X. T.; Sham, T. K.; Chan, C. Y.; Zhang, W. J.; Bello, I.; Lee, S. T.; Heigl, F.; Jürgenen, A.; Hofsäss, H. // Journal of Materials Research;Jan2006, Vol. 21 Issue 1, p147 

    Two cubic boron nitride (c-BN) thin films (thickness, 80 nm), which were grown on silicon by mass-selected ion beam deposition and thin diamond film-coated silicon by magnetron sputtering technique respectively, were investigated by x-ray absorption near-edge spectroscopy (XANES) at the B...

  • A flow-through x-ray absorption spectroscopy cell for characterization of powder catalysts in the working state. Odzak, J. F.; Argo, A. M.; Lai, F. S.; Gates, B. C.; Pandya, K.; Feraria, L. // Review of Scientific Instruments;Oct2001, Vol. 72 Issue 10, p3943 

    We report the design and demonstration of an x-ray absorption spectroscopy (XAS) cell used for the characterization of solid (powder) catalysts in operation with gas-phase reactants. The use of powder samples removes complications arising from mass transfer limitations in pressed wafer samples,...

  • An edge with XAS. George, Graham N.; Hedman, Britt; Hodgson, Keith O. // Nature Structural Biology;Aug2002 Supplement, Vol. 5, p645 

    X-ray absorption spectroscopy, which relies on synchrotron radiation, can accurately determine aspects of metalloprotein active site structure, can be applied to solution or crystalline samples and can be used independently or to supplement crystallographic information.

  • Tails of near-edges x-ray absorption spectra as a fingerprint of magnetic and structural phase transitions. Application to metallic 3d ultra thin films. Marangolo, M.; Ohresser, P.; Brooks, N. B.; Cherifi, S.; Boeglin, C.; Eddrief, M.; Etgens, V. H. // Journal of Applied Physics;5/1/2003, Vol. 93 Issue 9, p5151 

    Tails of x-ray absorption near-edge structure (XANES)/x-ray magnetic circular dichroism spectroscopy (XMCD) spectra (50–100 eV above the edges) are characterized by the beginning of the extended x-ray absorption fine-structure/magnetic extended x-ray absorption fine-structure...

  • Unified interpretation of pre-edge x-ray absorption fine structures in 3d transition metal compounds. Wu, Z. Y.; Natoli, C. R.; Marcelli, A.; Paris, E.; Bianconi, A.; Saini, N. L. // AIP Conference Proceedings;2003, Vol. 652 Issue 1, p497 

    Here we discuss origin of pre-edge features in the K-edge absorption spectra of transition metal atoms in octahedral coordination, in oxides and sulphides. We provide a unifying interpretation on the basis of multiple scattering simulations performed with different cluster models. We find that...

  • Atomic form factors and photoelectric absorption cross-sections near absorption edges in the soft X-ray region. Chantler, C. T. // AIP Conference Proceedings;2003, Vol. 652 Issue 1, p370 

    Reliable knowledge of the complex X-ray form factor [Re(f) and Im(f)] and the photoelectric attenuation coefficient (σ[sub PE]) is required for crystallography, medical diagnosis, radiation safety and XAFS studies. Key discrepancies in earlier theoretical work are due to the smoothing of edge...


Read the Article


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

Try another library?
Sign out of this library

Other Topics