International Business Machines Corporation

Hitachi Global Storage Technologies Netherlands B.v.

William G McChesney

Eric Edward Fullerton

Manfred Ernst Schabes

Kai Tang

David Thomas Margulies

Hugo Alberto Santini

Hoa Van Do

Mary Frances Doerner

Johannes Grandia

Harold L Turk

A magnetic recording medium for data storage uses a magnetic recording layer having at least two ferromagnetic films with different remanent magnetization-thickness (Mrt) values that are coupled antiparallel across a nonferromagnetic spacer film predominantly by the dipole field (H ) from the grains of the higher-Mrt ferromagnetic film. The material compositions and thicknesses of the ferromagnetic films and the nonferromagnetic spacer film are selected so that H predominates over any antiferromagnetic exchange coupling field (H ) and is greater than the coercive field of the lower-Mrt ferromagnetic film. As a result, the magnetizations of the two ferromagnetic films are antiparallel in the two remanent magnetic states, and thus the net remanent magnetization-thickness product (Mrt) of the recording layer is the difference in the Mrt values of the two ferromagnetic films.

Magnetic recording medium with antiparallel coupled ferromagnetic films as the recording layer

A holder for liquid phase epitaxial (LPE) growth which eliminates mesas on the surface of the film is described. The holder has two legs to which a ring is connected. The ring has holding means so that it can hold one wafer or two wafers back-to-back. One of the two legs extends vertically below the first ring. In a preferred embodiment a second ring having holding means for a pair of wafers back-to-back is attached to the elongated leg. This holder structure prevents a film from the liquid melt from forming when the holder is withdrawn from the liquid growth solution, thereby eliminating the formation of mesas which occur when the film ruptures.

Holder for liquid phase epitaxial growth

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San Jose, CA, United States of America

William G McChesney