A low-noise medium using double-layer CoNiCr thin films for high-density longitudinal magnetic recording has been developed. This medium consists of a Cr underlayer, a first CoNiCr layer, a Cr interlayer, and a second CoNiCr layer. In this study, the effects of Cr interlayer on the magnetic properties and read/write characteristics are investigated. Coercivity increases while remanence thickness product and coercive squareness decrease with increasing Cr interlayer thickness. The media noise is reduced by the presence of the Cr interlayer, and when the sum of the thicknesses of the CoNiCr layers is fixed, the minimum in the media noise and the maximum in the signal-to-noise ratio are obtained in the case when the two CoNiCr layers are of equal thickness. Because of the great reduction in the media noise, we have obtained signal-to-noise ratio of 35.5 dB at 33 kfci, which is greater than that of a single-layer medium by 4 dB. Also, the data suggest that the reduction in the media noise is due to a reduction in the interlayer coupling, by introducing the Cr interlayer, which is accompanied by a reduction in the coercive squareness.
In order to search for relaxor ferroelectrics or relaxor antiferroelectrics in Pb-excluded substances, ferroelectric and antiferroelectric mixed crystals Rb 1−x (NH 4 ) x H 2 PO 4 are investigated from the theoretical viewpoint of the precursor to glass state. Both boundary regions between ferroelectric (FE) and glassy (G) phases, and between antiferroelectric (AFE) and glassy (G) phases are examined and relaxor-like behaviors are found in the present theory on X-ray diffraction and on dielectric constants. The relaxor-like behavior as an embryo of the glass is proposed in the antiferroelectric-glass (AFE-G) phase boundary region where the growth of glass ordering is shown in quite a different pattern from that of the FE-G phase boundary region. The condition for appearance of the relaxor is discussed as being due to the proton spatial correlation in structurally frustrated systems.
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