Static and dynamic magnetic properties of bcc Fe sub(49)Co sub(49)V sub(2 ) thin films on Si(l00) substrates

• Published in: Journal of physics. D, Applied physics Vol. 46; no. 49; pp. 1 - 6
• Main Authors: Y, Wei, R, Brucas, K, Gunnarsson, I, Harward, Z, Celinski, P, Svedlindh
• Format: Journal Article
• Language: English
• Published: 11.12.2013
• Subjects: Coercive force; Damping; Dynamic mechanical properties; Dynamics; Kerr effects; Magnetic properties; Magnetron sputtering; Thin films
• ISSN: 0022-3727; 1361-6463
• DOI: 10.1088/0022-3727/46/49/495002

Thin films of Fe sub(49)Co sub(49)V sub(2 ) have been grown on Si(100) substrates by dc magnetron sputtering varying the substrate temperature in the range from room temperature (RT) to 600 [degrees]C. The static magnetic properties of the films were studied using a superconducting quantum interference device and magneto-optic Kerr effect magnetometry, while x-ray diffraction and reflectivity measurements have been used for the evaluation of the structural properties and thickness of the prepared samples. The easy axis coercivity decreases from 60 Oe for the sample grown at RT to 15 Oe for the one grown at 400 [degrees]C. We also studied the dynamic magnetic properties of the samples by using the high-frequency vector network analyser ferromagnetic resonance (FMR) technique. Results from FMR measurements show that the extrinsic linewidth decreases with increasing growth temperature up to 450 [degrees]C and then increases with further increase of growth temperature. The source of the extrinsic linewidth is two-magnon scattering by small, weak inhomogeneities. The intrinsic Gilbert damping ([alpha]) follows a similar trend to the extrinsic linewidth, with the lowest damping constant [alpha] [thickapproximate] 0.005 found at a growth temperature of