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26 April 2024 |
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Epitaxial film growth and magnetic properties of Co_2FeSi | | H. Schneider
; G. Jakob
; M. Kallmayer
; H. J. Elmers
; M. Cinchetti
; B. Balke
; S. Wurmehl
; C. Felser
; M. Aeschlimann
; H. Adrian
; | | Date: |
26 Jun 2006 | | Subject: | Materials Science | | Abstract: | We have grown thin films of the Heusler compound Co_2FeSi by RF magnetron sputtering. On (100)-oriented MgO substrates we find fully epitaxial (100)-oriented and L2_1 ordered growth. On Al_2O_3 (11-20) substrates, the film growth is (110)-oriented, and several in-plane epitaxial domains are observed. The temperature dependence of the electrical resistivity shows a power law with an exponent of 7/2 at low temperatures. Investigation of the bulk magnetic properties reveals an extrapolated saturation magnetization of 5.0 mu_B/fu at 0 K. The films on Al_2O_3 show an in-plane uniaxial anisotropy, while the epitaxial films are magnetically isotropic in the plane. Measurements of the X-ray magnetic circular dichroism of the films allowed us to determine element specific magnetic moments. Finally we have measured the spin polarization at the surface region by spin-resolved near-threshold photoemission and found it strongly reduced in contrast to the expected bulk value of 100%. Possible reasons for the reduced magnetization are discussed. | | Source: | arXiv, cond-mat/0606666 | | Services: | Forum | Review | PDF | Favorites | |
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