Method of depositing a layer of magnetic bubble domain material on a monocrystalline substrate

Claim 1

A method of depositing an epitaxial layer of a magnetic bubble domain material of rare earth-iron garnet on a monocrystalline substrate, in which method a quantity of starting material is heated so as to form a uniform melt, then cooled to a supersaturated condition at a temperature substantially equal to a temperature T g , and after which the substrate is contacted with the melt until an epitaxial layer of the desired thickness has been deposited on the substrate, wherein a starting material is chosen which provides an epitaxial layer represented by an atomic formula in which the iron ions are partly substituted by two types of non-magnetic ions, one type, if substituted alone, would give rise to a material with (d/dT.sub.g) 4πM.sub.s <0, the other type, if substituted alone, would give rise to a material with (d/dT.sub.g) 4πM.sub.s >0, the atomic ratio between the quantities of the two types of non-magnetic ions being chosen such that at T g 1/H.sub.o (d/dT.sub.g) H.sub.o is zero or substantially zero, wherein 4πM s is the saturation magnetization of the material, and H o is the bubble domain collapse field.

Claim 2

A method of depositing an epitaxial layer of a magnetic bubble domain material of rare earth-iron garnet on a monocrystalline substrate, in which method a quantity of starting material is heated so as to form a uniform melt, then cooled to a supersaturated condition at a temperature substantially equal to a temperature T g , and after which the substrate is contacted with the melt until an epitaxial layer of the desired thickness has been deposited on the substrate, wherein a starting material is chosen which provides an epitaxial layer represented by an atomic formula in which the iron ions are partly substituted by two types of non-magnetic ions, one type, if substituted alone, would give rise to a material with (d/dT.sub.g) 4πM.sub.s <0, the other type, if substituted alone, would give rise to a material with (d/dT.sub.g) 4πM.sub.s >0, the atomic ratio between the quantities of the two types of non-magnetic ions being chosen such that at T g 1/H.sub.o (d/dT.sub.g) H.sub.o is zero or substantially zero, wherein 4πM s is the saturation magnetization of the material, and H o is the bubble domain collapse field.