Showing papers by "David R. Smith published in 1992"
01 Jul 1992
TL;DR: In this article, the authors introduce a new accelerator cavity design based on Photonic Band Gap (PBG) structures, which consists of a two-dimensional periodic array of high dielectric, low loss cylinders with a single removal defect, bounded on top and bottom by conducting sheets.
Abstract: We introduce a new accelerator cavity design based on Photonic Band Gap (PBG) structures. The PBG cavity consists of a two‐dimensional periodic array of high dielectric, low loss cylinders with a single removal defect, bounded on top and bottom by conducting sheets. We present the results of both numerical simulations and experimental measurements on the PBG cavity.
22 citations
TL;DR: In this article, a dual magnetoresistive (DMR) reproduce head, consisting of two identical, adjacent MR stripes separated by a nonmagnetic spacer and connected electrically in parallel, was shown to have potential in very high density magnetic recording applications.
Abstract: A proposed dual magnetoresistive (DMR) reproduce head, consisting of two identical, adjacent MR stripes separated by a nonmagnetic spacer and connected electrically in parallel, was shown to have potential in very high density magnetic recording applications. The authors consider the micromagnetics of this device and derive approximate analytical expressions for the expected signal output as a function of linear recording density. The expression for the intrinsic reproduce sensitivity vs. recorded density, when including a proposed correction to account for the energy of traditionally neglected edge fringing fields, are shown to be in good agreement with more exact numerical results. The same form of equations is shown to be useful for deriving, via reciprocity, analogous and reasonably accurate analytical results for the shielded MR head. >
18 citations
13 Apr 1992
TL;DR: In this article, a dual magnetoresistive (DMR) reproduce head was proposed, consisting of two identical, adjacent MR stripes separated by a nonmagnetic spacer and connected electrically in parollel, was shown to have potential in very high density magnetic recording applications.
Abstract: A recently proposed' dual magnetoresistive (DMR) reproduce head. consisting of two identical, adjacent MR stripes separated by a nonmagnetic spacer and connected electrically in parollel, was shown to have potential in very high density magnetic recording applications. The present work considers the micromagnetics of this coupled layer device, and derives ayproximate analytical expressions for the expected signal output as a function of in-track recording density. The results are found to be in good agreement with numerical computations based on reciprocity. Comparison with analytical results for other MR head configurations is discussed. DMRvsis MethQd The basic geometry of a DMR sensor is shown in Fig. I. Identical MR elements "I' and "2" carry equal sense current I /2 along the -2 (easy axis) direction, producing opposite polarity bias fields at t e adjacent h!iR layer, and hence nnfisymrnefric bias magnetiza2ns distLbutions %,(x,y) - -&x,y) (f component excluded). The net magnetization Gl t M,,,, t bM,,, also includes the modulation a(x,y) due to signal field from a recorded medium. Given a local resistivity p1 a = po + Ad1 - (MI ,/M,)*) (M, = saturation magnetization), the net resistance R of the DMR'sensor in the two-dhensional approximation is, to order (Aplp,)',
1 citations