Abstract: An optical system useful, e.g., for near-field scanning optical microscopy is provided. The system incorporates a probe having improved properties. In one embodiment, the probe comprises a tapered and partially metallized portion of a single-mode optical fiber.

Abstract: An optical system useful, e.g., for near-field scanning optical microscopy is provided. The system incorporates a probe having improved properties. In one embodiment, the probe comprises a tapered and partially metallized portion of a single-mode optical fiber.

Abstract: An optical system useful, e.g., for near-field scanning optical microscopy is provided. The system incorporates a probe having improved properties. In one embodiment, the probe comprises a tapered and partially metallized portion of a single-mode optical fiber.

Abstract: An optical system useful, e.g., for near-field scanning optical microscopy is provided. The system incorporates a probe having improved properties. In one embodiment, the probe comprises a tapered and partially metallized portion of a single-mode optical fiber.

Abstract: An optical system useful, e.g., for near-field scanning optical microscopy is provided. The system incorporates a probe having improved properties. In one embodiment, the probe comprises a tapered and partially metallized portion of a single-mode optical fiber.

Abstract: An optical system useful, e.g., for near-field scanning optical microscopy is provided. The system incorporates a probe having improved properties. In one embodiment, the probe comprises a tapered and partially metallized portion of a single-mode optical fiber.

Abstract: Filamentary and sheet-like oxide superconductive bodies can be produced by ceramic fabrication techniques such as extrusion, screen printing, tape casting and slip casting, provided the firing conditions are chosen such that the correct amount of oxygen deficiency is attained in the ceramic, and such that contact with chemically non-compatible material is avoided. Thus produced superconductive bodies are advantageously incorporated into apparatus such as magnets, power cables, interconnects, electrical components, and sensors.

Abstract: Separation between a magnetized member and a Type II superconducting member inherently manifestets stability in separation distance, in lateral direction and in attitude. Uses include levitation of fixed and moveable members as well as superconducting bearings.

Abstract: Devices based on epitaxial garnet layers that exhibit a high magnetic anisotropy are disclosed. These garnet layers are produced by introducing a Co.sup.2+ or a species with 1, 2, 4, or 5 electrons in a 4d or a 5d electron orbital in the octahedral site of the garnet in conjunction with a typical anisotropy producing combination on the dodecahedral site. The contribution to magnetic anisotropy due to the typical combination on the dodecahedral site and the appropriate ion in an octahedral site is complementary.

Abstract: Devices based on epitaxial garnet layers which exhibit a substantial contribution to the magnetic anisotropy other than that attributable to the presence of magnetic rare earth ions are disclosed. These garnet layers are produced by introducing Co.sup.2+ or a species with 1, 2, 4, or 5 electrons in a 4d or 5d electronic orbital in the octahedral site of the garnet. It is possible to produce epitaxial garnets having low damping constants, as determined by resonance line widths on the order of 100 Oe, and K.sub.u 's on the order of 300,000 ergs/cm.sup.3.

Abstract: Desirable properties of manganese zinc ferrites are obtained without the need for controlling or changing the oxygen partial pressure during the sintering and cooling steps by adding a small amount of germanium or gallium to the ferrite and using an atmosphere, such as air, during the sintering and cooling steps, that has at least 1 percent oxygen by volume.

Abstract: A ferrite material has been found that is useful for a biasing magnet whose magnetic field stabilizes single wall magnetic domains. The strong temperature dependence of the ferrite's magnetic field makes the ferrite especially useful when used with magnetic materials which require a highly temperature dependent magnetic field to maintain a constant domain or bubble size. The ferrite composition is represented by the formula NiFe.sub.(1+x) Cr.sub.(1-x) O.sub.4, x is in the range between 0.04 and 0.18, and 1 percent to 10 percent, by weight, additional material selected from the group consisting of zirconium oxide, thorium oxide and hafnium oxide.

Abstract: The discovery of a magnetoresistive effect in oriented, crystalline, semiconducting iron garnet materials is used to design devices which detect the presence or orientation of magnetic fields. The principal measure of this effect is that the resistance between two electrodes (12) on the garnet body (11) varies as an imposed magnetic field (14, 15) produces a change in the direction of the magnetization of the body (11). This effect is useful when the garnet is so constituted as to possess a resistivity from 10.sup.3 to 10.sup.7 ohm-centimeters. Also, the anisotropy field of the garnet body must be comparable to less than the magnitude of the magnetic field to be detected. One aspect of particular utility for magnetic "bubble" detectors (in magnetic bubble memories) is the isotropic character of the resistance when the magnetization is varied in the (111) plane but the significant change of resistance when the magnetization is moved to the [111] direction.

Abstract: The disclosed magnetic devices, including a magnetically coupled conducting path, incorporate amorphous, low magnetostriction alloys of the general formula (Co.sub.a Fe.sub.b T.sub.c).sub.i X.sub.j, the "metallic" constituents thereof being within the parenthetical expression. T, in the formulation, is selected from among Ni, Cr, Mn, V, Ti, Mo, W, Nb, Zr, Pd, Pt, Cu, Ag and Au, X being at least one "glass former" selected from among P, Si, B, C, As, Ge, Al, Ga, In, Sb, Bi and Sn. The "metallic" constituents comprise from 70-90 atomic percent of the alloy with cobalt being present in an amount of at least 70 atomic percent of the "metallic" constituents. The described material has been prepared by rapid cooling from the liquid, directly to the shape needed for fabrication of the device (e.g., tape to be wound to form an inductor core).

Abstract: A method is disclosed for suppressing hard bubbles in epitaxial magnetic garnet films. The method comprises annealing in an essentially inert atmosphere and renders the annealed film incapable of sustaining hard bubbles.