Anupam, ; Joshi, P. C. ; Rout, P. K. ; Hossain, Z. ; Budhani, R. C. (2010) Charge transport and magnetic ordering in laser ablated Co2FeSi thin films epitaxially grown on (1 0 0) SrTiO3 Journal of Physics D: Applied Physics, 43 (25). p. 5002. ISSN 0022-3727
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Official URL: http://iopscience.iop.org/0022-3727/43/25/255002
Related URL: http://dx.doi.org/10.1088/0022-3727/43/25/255002
Abstract
We have successfully deposited epitaxial thin films of the Heusler alloy Co2FeSi on (1 0 0) cut SrTiO3 single crystal substrates by pulsed laser deposition. X-ray diffraction reveals the L21 cubic crystal structure for the films grown at 400 and 600 °C, with a better crystallographic quality at the higher growth temperature. The magnetic moment in saturation of the 600 °C grown film is 5.0 µB/fu at 5 κ with the easy axis of magnetization in the (1 0 0) plane. Inplane hysteresis measurements suggest a soft magnetic state with a coercive field HC≈ 250 Oe at 5 K for the 600 °C film which decreases on lowering the growth temperature. The normalized magnetization of thin films follows the well-known Bloch T3/2 law due to spin wave excitation. Electrical resistivity measurements on the films with the L21 crystal structure show a pronounced metallic behaviour down to the lowest temperature of measurement (≈5 K), and enhanced metallicity in the 600 °C film as indicated by its lower residual resistivity (≈0.16 µΩ cm) and higher residual resistivity ratio (RRR 1280). These results suggest that films grown at the higher temperature may be better suited for the fabrication of magnetic tunnel junctions.
Item Type: | Article |
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Source: | Copyright of this article belongs to Institute of Physics Publishing. |
ID Code: | 5717 |
Deposited On: | 19 Oct 2010 11:21 |
Last Modified: | 23 May 2011 06:58 |
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