Abstract: The present invention relates to compensated crystalline superlattice ferrimagnets. The ferrimagnets include multiple ferromagnetic layers having different magnetic disordering temperatures in combination with antiferromagnetically coupled layers. The crystalline ferromagnetic layers may include metals or alloys such as Ni, Co and Fe. The crystalline antiferromagnetically coupled layers may include metals or alloys such as Rh, Ir, Cr, Ru, Os, W and Mn. The superlattice ferrimagnets may be used in such applications as data storage or memory layers in thermally assisted magnetic recording media.

Abstract: A thin film magnetodielectric (TFM) structure is disclosed which has effective absorption with minimal reflection of electromagnetic radiation over a broad band of frequencies. The thin film magnetodielectric structure has an effective electric susceptibility and effective magnetic susceptibility which are substantially equal for a broad band of electromagnetic wavelengths. The disclosed TFM structure includes layers of thin film magnetic elements which are surrounded by and supported in a dielectric medium. Each thin film element is preferably rectangular in shape and has a thickness substantially less than the long and short axes of the element. Each layer includes a plurality of elements arranged in an orderly array with the long axes of each element in a layer substantially parallel to each other. Either neighboring layers or neighboring stacks of layers have elements whose long axes are oriented at 90°.

Abstract: An optical drive apparatus for use with a multilayer optical data storage device, includes: at least two spaced apart storage layers, each of such layers being adapted to store information; a spacer layer positioned between alternating storage layers; at least one of the storage layers including tracking and/or format information, while another storage layer does not include tracking and/or format information; and writing apparatus including a plurality of radiation beams arranged such that at least one beam is focused on a layer with tracking and/or format information and provides tracking and/or format information to at least one other beam that is focused on a layer to be written that does not have substantial tracking and/or format information.

Abstract: A multilayer optical data storage device is disclosed which has at least two spaced apart storage layers, each of such layers being adapted to store information; a spacer layer positioned between alternating storage layers; and at least one of the layers including tracking and/or format information, and at least one storage layer that does not include substantial tracking and/or format information.