Abstract: A method of producing a thin film magnetic device comprising forming a thin film of magnetic material over a surface of a substrate having a controlled surface topography, wherein the surface of the substrate is first subject to isotropic etching so as to increase the capacity of the substrate surface to induce a high orientation ratio in a thin film of magnetic material formed over the substrate surface without a reduction in the smoothness of the substrate; and a method of modifying a thin film magnetic device comprising a thin film of a magnetic material, the method comprising the step of subjecting a surface of the thin film magnetic device having a controlled surface topology to isotropic etching so as to increase the orientation ratio of the thin film magnetic device without reducing the smoothness of the surface of the thin film magnetic device.

Abstract: A method and apparatus for modulating multilevel data arrays to make them suitable for storage in multidimensional storage media, such as in holographic storage. In order to get a uniform signal of constant energy at the recording plane, first the multilevel data array, Vout, displayed on a spatial light modulator, has frequent transitions between symbols of different levels, and second it has constant energy. The energy is defined as the summation of the values of the symbols in the data array. The first constraint is achieved using V′in=Vin⊕qM (q, ZO), where ⊕q stands for the modulo-q addition operation; M(q, ZO) is a data array with randomly distributed symbols of q levels, where q is the number of levels and ZO is the seed used to generate the random multilevel data array.

Abstract: A three-dimensional memory based on the electron trapping materials, comprising at least two thin film layers of different or the same electron trapping materials for storing information in the form of the trapped charges and releasing information in the form of light energy, each of the thin film layers of the electron trapping materials being sandwiched between a pair of transparent electrodes. The thin film layer itself is a multiple layer of one or more than two types of electron trapping materials in which the impurity atoms are modulation doped with predetermined modulation profiles. The page-by-page addressing is achieved by applying a suitable voltage to the information to be addressed. Separate control of writing and reading processes is made possible by varying the voltage polarity.