Magnetic bubble memory from 4F lanthanide and ferromagnetic type materials
AssigneeMax-Planck-Gesellschaft zur Forderung der Wissenschaften e.V.
InventorsClaudia Felser, Yangkun He
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Abstract
The present invention relates to a metallic hard magnetic material selected from an at least binary ferromagnetic or ferrimagnetic compound, with the metallic hard magnetic material including at least two different elements selected from the group consisting of 3d and 4f elements, where the metallic hard magnetic material is under an external magnetic field B of ≥0.1 T.
Claims25
A metallic hard magnetic material, selected from an at least binary ferromagnetic or ferrimagnetic compound, comprising at least two different elements selected from the group consisting of 3d and 4f elements, wherein the metallic hard magnetic material is under an external magnetic field B of >0.1 T,
- and said metallic hard magnetic material exhibits a magnetic hardness parameter x of larger than .squareroot.2/2, and a Curie temperature of higher than 300 K, and a K.sub.u of >0.5 MJn3 at 300 K, where K.sub.u is the material's uniaxial magnetocrystalline anisotropy.
A method of generating magnetic bubbles in a metallic hard magnetic material selected from an at least binary ferromagnetic or ferrimagnetic compound comprising selecting at least two different elements from the group consisting of 3d and 4f elements, forming a metallic hard magnetic material therefrom and subjecting the metallic hard magnetic material to an external magnetic field B of ≥0.1 T,
- wherein the metallic hard magnetic material exhibits a magnetic hardness parameter x of larger than .squareroot.2/2, and a Curie temperature of higher than 300 K, and a K.sub.u of >0.5 MJm 3 at 300 K, where K.sub.u is the material's uniaxial magnetocrystalline anisotropy.
Dependencies are inferred from the claim text.