A magnetic core stack is comprised of a laminate of individual layers of substantial thinness mounted on a common stiff base member to provide a rugged, low mass structure of high resonant frequency. Each of the individual layers is comprised of a plurality of magnetic cores held in place by soft, energy absorbing material such as silicone rubber coated on the surfaces of opposite ground plane forming materials such as very thin sheets of aluminum. The laminate is formed from a single layer of material which supports a layer of magnetic cores and which is folded over upon itself one or more times to form the separate layers of the laminate. In one embodiment, a sheet of aluminum coated with silicone rubber on both sides is inserted as the single layer of material is initially folded over to form a two layer stack in which each layer of cores is held between opposite sheets of aluminum by silicone rubber coated on the aluminum. The two layer stack may then be folded over on itself one or more times to form a four or six layer laminate. In an alternative embodiment the single layer of material is comprised of opposite sheets of silicone rubber coated aluminum having a layer of tape on one of the silicone rubber coatings and sandwiching a layer of cores therebetween. The resulting arrangement is then folded over upon itself one or more times to form a multilayer laminate with the facing sheets of aluminum being held together with adhesive. Portions of the edges of the single layer of material are extended and mount X and Y diode boards which are mounted in spaced-apart relation with the laminate on the common stiff base member to form a memory module along with certain other components.
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