Improvement in spin-wave resonance characteristics of epitaxial barium-ferrite thin films by using an aluminum-doped strontium-ferrite buffer layer

Journal Article

Shinde, S.R., S.E. Lofland, C.S. Ganpule, S.M. Bhagat, S.B. Ogale, Ramamoorthy Ramesh, T. Venkatesan

10.1063/1.123156

We report on the effects of using SrFe7Al5O19 as a buffer layer for growth of high-quality epitaxial barium-ferrite thin films on sapphire substrates. X-ray diffraction studies reveal that the buffer layer causes the interfacial strains in the barium-ferrite films to relax. As a result, the ferromagnetic resonance linewidth decreases even in the as-deposited case. However, the more striking result is the drastic reduction in the linewidth that occurs when the barium-ferrite film is deposited on the buffer layer and subsequently annealed at 1000°C for 2 h, allowing the observation of a large number of spin-wave resonances (up to the 15th mode), indicating an improvement in both the surface and interface characteristics. © 1999 American Institute of Physics.

Applied Physics Letters

74

1999

00036951

Ramesh Lab