A plasma antenna generator includes an ionizable material, an explosive charge capable of projecting the ionizable material upon detonation, and a detonator coupled with the explosive charge. The pin has a compressible nose, with the wide part of the nose being larger than the retaining hole. The transverse-pinning-layer antiferromagnetic material and the longitudinal-pinning-layer antiferromagnetic material are preferably PtMn or NiMn. The apparatus comprises lamination rollers forming a nip and means for carrying the electrically conductive support film and the at least one electrode sheet to the nip formed by the lamination rollers. 75 where 200 \u03bcm\u2266W<300 \u03bcm; H\u2267W4 where 100 \u03bcm\u2266W<200 \u03bcm; and H\u2267W10 where W<100 \u03bcm. One or more of the solid reactant materials may be concentrated proximate the inlet so as to achieve a rapid initial reaction upon introduction of water, or may be concentrated in defined packets at spaced apart locations within the matrix to achieve a more moderated action.