U.S. Philips Corporation

Johannes A Pistorius

Mark Thomas Johnson

Jan Haisma

Dieter W Mateika

Johannes P Damen

Leonardus A Van Hoof

Johannes F Cillessen

Horst Laudan

Monocrystalline MnZn-ferroferrite material having a high Zn-content, and magnetic head comprising the said material. A monocrystalline MnZn-ferroferrite material for use in a magnetic head is described. The material corresponds to the formula

Monocrystalline MnZn-ferroferrite material having a high content of Zn,

A description is given of the composition and preparation of single phase crystals having a garnet structure and a lattice constant smaller than 11.9 .ANG.. The garnets correspond to the formula

Monocrystalline material having garnet structure

A novel non-magnetic monocrystalline garnet substrate material in the form of calcium--gallium-germanium garnet. Single crystals of calcium-gallium-germanium garnet can be grown at mush lower temperatures by means of the Czocharalski method than single crystals of the conventional rare earth-gallium garnets. These single crystals are very suitable to epitaxially grow bubble domain films thereon, in particular films on the basis of Lu.sub.3 Fe.sub.5 O.sub.12.

Single crystal of calcium-gallium germanium garnet and substrate

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Eindhoven, Netherlands

Johannes A Pistorius