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Experimental measurements have shown that nondestructive magneto‐optic readout from magnetic film computer elements by means of the longitudinal Kerr‐effect can operate at rates of at least one million bits per second. If the steady light source of the magneto‐optic apparatus is...
An investigation in the ternary system FeVO has been made of the chemical, crystallographic, and magnetic properties of the corundum FeVO 3 , and the spinels FeV 2 O 4 and Fe 2 VO 4⋅ FeVO 3 has been reported in the literature as Fe 2+ V 4+ O 3 and antiferromagnetic at room temperature. However,...
The recent discovery that Nb 3 Sn remains superconducting in magnetic fields exceeding 88 kgauss while carrying current densities in excess of 100 000 amp∕cm 2 has stimulated widespread activity directed toward the construction of superconducting magnets and the understanding of ``hard''...
Alumina whiskers have been grown on single‐crystal alumina substrates by heating aluminum filings, located near the crystals, to 1400°C in a stream of wet hydrogen. The whiskers grew crystallographically coherent with the substrate, and had their axes either parallel to the c axis or in one of...
A theoretical prediction is made that the uniform resonance and the spinwaves in a very thin ferrimagnetic disk can be made nondegenerate. If this condition can be achieved experimentally, the usual second order spinwave instabilities will be forbidden and cannot limit the component of the...
Beryllium oxide platelets and whiskers have been grown by heating beryllium metal in a silica furnace tube and boat with a hydrogen atmosphere for 16 hr at 1500°C. Three distinct types of whiskers formed: one type was parallel to the crystallographic c axis, another in the basal plane (1010...
General expressions are developed for the shielding factors of concentric spherical shells of linear isotropic magnetic material. Approximate results are given for shells of highly permeable material which are thin compared to their radii.
The use of an ordinary toroidal core without air‐gap as a flux‐gate magnetometer has been overlooked. A magnetometer using such a core as the field‐sensitive element with semicircularly wound and differentially connected second‐harmonic detector windings has been developed. The semicircle...
Studies of acoustic losses in single crystal garnets and ferrites using magnetostrictively driven spherical resonators are described. Resonant modes have been observed in spheres of yttrium iron garnet (YIG) at ∼9 Mc and room temperature with Q ′s of ∼10 7 . This is approximately six times...
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