Patent ID: 7718987

Claim:
A data recording element comprising: a plurality of multiple-layer structures wherein each of said plurality of multiple-layer structures comprises of a plurality of layers of phase change materials; a first layer of each of said plurality of layers being a first phase change material; a second layer of each of said plurality of layers being a second phase change material having at least one atomic element absent from said first phase change material; an initial layer of phase change material that is a first layer of said plurality of layers of a first one of said plurality of multiple-layer structures; a final layer of phase change material over a final one of said plurality of multiple-layer structures wherein said phase change material of said initial layer and said phase change material of said final layer have a lower crystallization temperature and a higher crystallization speed than phase change materials in a remainder of said plurality of layers in each of said plurality of multiple-layer structures, wherein said crystallization temperature of said phase change material of said initial layer and said phase change material of said final layer is in a range from about 90 degrees Celsius to about 120 degrees Celsius.