Cobalt-titanium substituted barium ferrite films for magneto-optical memory

Abstract

Articles you may be interested inEvidence of localized surface plasmon enhanced magneto-optical effect in nanodisk array Appl. Phys. Lett. 96, 081915 (2010); 10.1063/1.3334726Magneto-optical spectroscopy study of the solid-state reaction in Ti/Ni multilayered films Magnetooptical Faraday effect of porous films comprised of cobaltsubstituted barium ferrite fine particles dispersed in a resinWe have studied Faraday rotation and magnetic properties of Co-Ti substituted barium ferrite films with perpendicular anisotropy, which were prepared by targets-facing-type sputtering method on ( 111) oriented GGG substrates. Faraday rotation «(J F) of 500-830 nm was measured by using the Faraday modulation method. It was found that fiF increased proportionally to the content of cobalt in the wavelength range 700-830 nm. In the BaFe lO .42 CO O . 78 Ti o . s 0 19 fi1m, Faraday rotation and magnetic properties were as fonows: OF = 0.75 deg/pm at 780 nm, anisotropy field: Hk = 5.2 kOe, coercive force: He = 800 Oe, Curie temperature: Tc = 380 ·C. Thermomagnetic recording was achieved on this film by using a 780-nm laser diode. As a result, 2.0-pm bit patterns were observed by Faraday effect.

High-Resolution Transmission Electron Microscopy Studies of Sol–Gel-Derived Cobalt-Substituted Barium Ferrite

“…With the increasing demands for an erasable high bit density data storage system, fine particle of cationsubstituted barium ferrite are widely anticipated to be a suitable candidate for future high-density magneto-optical recording (5). It is known that magneto-optical effects in the magnetic recording may be substantially enhanced by ion substitution (6).…”

Optical Reflection and Polar Kerr Rotation of Cobalt and Titanium Substituted Barium Hexaferrites

“…BaTi sample) modifies the almost constant Kerr rotation values of BaM into the spectral dependent curve that reminds PKR behaviour of magnetite [7][8][9]. Also the introduction of cobalt induces new spectral features that are complementary to those observed in the Faraday rotation spectra of Co-Ti-substituted hexaferrite platelets [3] or thin films [10][11][12]. In contrast to the unusually large PKR values (about 1 degree) obtained on the flux grown single crystals earlier [2] the present local extrema observed at photon energies of about 0.7, 0.9 and 1.7 eV (Le.…”

Quantum theory of the magneto-optical effect induced by Ni ions in barium ferrites

“…a e-mail: mguillot@labs.polycnrs-gre.fr It is known that the MO effects in ferrites may be substantially enhanced by ion substitution. In barium ferrite, substitution using Co 2+ ions has already been the subject of many reports [5][6][7][8]. Recently, it was found that Ni substitution in barium ferrites enhances strongly the Kerr and Faraday rotations [9,10].…”