1. A memory cell, the memory cell being part of a memory cell device, comprising: first and second electrodes; a memory material element electrically coupling the first and second electrodes; the memory material element comprising a first memory material, the first memory material comprising a phase change memory material; a thermal insulating layer surrounding the memory material element; the thermal insulating layer comprising a second memory material, the second memory material comprising a second phase change memory material comprising a chalcogenide; and a dielectric layer separating and electrically insulating the thermal insulating layer from the memory material element.