CHINESE JOURNAL OF PHYSICS VOL. 39, NO. 6 DECEMBER 2001

Magnetic and Structural Properties of RF Sputtered Polycrystalline
Lithium Mixed Ferrimagnetic Films

P. Samarasekara¹ and F. J. Cadieu<sup>2

1</sup>Department of Physics, Ruhunu University, Matara, Sri Lanka

²Department of Physics, Queens College of CUNY, Flushing, New York, NY11367, U.S.A.
(Received May 2, 2001)

Compounds with Mn, Ti and Zn have been added to Li ferrite to decrease the magnetic moment of this soft ferrimagnetic compound. Ferrimagnetic compounds with smaller saturation magnetic moments are useful in microwave applications and in high-density recording. These ferrimagnetic films have been deposited on Al₂O₃ polycrystalline substrates at different Ar/O₂ pressures and at different substrate temperatures. Some of the films deposited at lower temperatures in Ar gas only were annealed in oxygen to improve their properties. The magnetic and structural properties of these films depend on the substrate temperature, oxygen partial pressure and the post deposition annealing conditions. The coercivity of films increases with the deposition temperature, oxygen partial pressure, annealing time duration and annealing temperature. The ferrimagnetic films with higher coercivities can be used in high-density magnetic recording media.

PACS. 67.70.+n - Films.
PACS. 75.50.Gg - Ferrimagnetics.
PACS. 68.55.Jk - Structure and morphology; thickness.

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