Deposition and properties of polycrystalline cobalt ferrite films for magneto-optical recording

K. P. Polyakova; V. A. Seredkin; V. V. Polyakov; A. A. Lepeshev; Vladimir F. Pavlov

doi:10.1117/12.301402

1 January 1998 Deposition and properties of polycrystalline cobalt ferrite films for magneto-optical recording

K. P. Polyakova, V. A. Seredkin, V. V. Polyakov, A. A. Lepeshev, Vladimir F. Pavlov

Proceedings Volume 3347, Optical Information Science and Technology (OIST97): Optical Recording Mechanisms and Media; (1998) https://doi.org/10.1117/12.301402
Event: Optical Information Science and Technology, 1997, Moscow, Russian Federation

Abstract

The polycrystalline cobalt ferrite films were deposited by dc-sputtering method from ferrite targets. These targets were conductive because of using of reduction atmosphere for time its preparation that allowed dc-sputtering. The magnetic and magneto-optical properties of these films have been investigated. The prepared Co_0.07Fe_2.3O₄ polycrystalline films had perpendicular magnetic anisotropy, high coercivity (2 - 5 kOe) and good hysteresis loop squareness. It was established that perpendicular anisotropy constant and coercivity of films depends on substrate thermal expansion coefficient. The wavelength dependence of Faraday rotation (Theta) _F is typical that for cobalt ferrite films and have two maximum: (Theta) _F equals 2,7 deg/micrometers within (lambda) equals 0,5 - 0,53 micrometers and (Theta) _F equals 2,5 deg/micrometers at (lambda) equals 0,8 micrometers , last presents the practical interest and is sufficiently high value. Magneto-optical figure of merit reaches 0,5 deg. at (lambda) equals 0,63 micrometers and 3,0 deg at (lambda) equals 0.8 micrometers . According to achieved results the polycrystalline cobalt ferrite Co_0.7Fe_2.3O₄ films are a good candidate for a magneto-optical storage media.

Citation Download Citation

K. P. Polyakova, V. A. Seredkin, V. V. Polyakov, A. A. Lepeshev, and Vladimir F. Pavlov "Deposition and properties of polycrystalline cobalt ferrite films for magneto-optical recording", Proc. SPIE 3347, Optical Information Science and Technology (OIST97): Optical Recording Mechanisms and Media, (1 January 1998); https://doi.org/10.1117/12.301402

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