| 摘要 |
1,135,168. Ferrites. INTERNATIONAL BUSINESS MACHINES CORP. 31 March, 1967 [25 April, 1966], No. 14822/67. Heading C1A. [Also in Divisions B1, H1 and H4] A monocrystalline spinel ferrite film is produced by coating a substrate crystal with a mixture of the ferrite and a solid flux, and heating to form initially a solution of ferrite in flux and then to evaporate the flux. The coating may be applied by evaporating a slurry of ferrite, flux, and isopropyl alcohol. The ferrite may be Li 0 . 5 Fe 2 . 5 O 4 , Li 0.5 Cr x Fe 2.5-x O 4 (O < x < 2), NiFe 2 O 4 , Ni 1-y Zn y Fe 2 O 4 (0 <y < 1), MgFe 2 O 4 , or CoFe 2 O 4 . The flux may be Na 2 CO 3 or Li 2 CO 3 and the weight ratio of flux: ferrite, 1: 3 to 9 :1. The substrate may be MgO, Al 2 0 3 or NiO and may subsequently be removed by grinding or cleaving. The coated substrate may be heated at 1050-1300‹ C. in air or O 2 . The film may be 5-50Á thick and may be used in magnetooptical devices or may be laminated and used to form magnetic recording heads. |
