Phase-change memory is being actively pursued as an alternative to the ubiquitous flash memory for data storage applications, because flash memory is limited in its storage density and phase-change memory can operate much faster.
Phase-change memory relies on materials that change from a disordered, amorphous structure to a crystalline structure when an electrical pulse is applied. The material has high electrical resistance in its amorphous state and low resistance in its crystalline state - corresponding to the 1 and 0 states of binary data.
Flash memory has problems when devices get smaller than 20 nanometers. But a phase-change memory device can be less than 10 nanometers - allowing more memory to be squeezed into tinier spaces. "That's the most important feature of this kind of memory", stated Xilin Zhou of the Shanghai Institute of Microsystem and Information Technology at the Chinese Academy of Sciences. Data can also be written into phase-change memories very quickly and the devices would be relatively inexpensive, he added.
So far, the most popular material for phase-change memory devices contains germanium, antimony, and tellurium. But compounds with three elements are more difficult to work with, Xilin Zhou said.
"It's difficult to control the phase-change memory manufacturing process of ternary alloys such as the traditionally used germanium-antimony-tellurium material. Etching and polishing of the material with chalcogens can change the material's composition, due to the motion of the tellurium atoms", explained Xilin Zhou.
Xilin Zhou and his colleagues turned to a material with just two elements: aluminum and antimony. They studied the material's phase-changing properties, finding that it's more thermally stable than the Ge-Sb-Te compound. The researchers discovered that Al50Sb50, in particular, has three distinct levels of resistance - and thus the ability to store three bits of data in a single memory cell, instead of just two. This suggests that this material can be used for multilevel data storage.
"A two-step resistance drop during the crystallization of the material can be used for multilevel data storage (MLS) and, interestingly, three distinct resistance levels are achieved in the phase-change memory cells", Xilin Zhou stated. "So the aluminum-antimony material looks promising for use in high-density non-volatile memory applications because of its good thermal stability and MLS capacity."
The researchers are now investigating the endurance or reversible electrical switching of the phase-change memory cell with MLS capacity.
The paper, "Phase-transition characteristics of Al-Sb phase change materials for phase change memory application", by Xilin Zhou, Liangcai Wu, Zhitang Song, Feng Rao, Kun Ren, Cheng Peng, Sannian Song, Bo Liu, Ling Xu, and Songlin Feng appears in the journalApplied Physics Lettersat http://dx.doi.org/10.1063/1.4818662 .
The authors are affiliated with the Shanghai Institute of Microsystem and Information Technology at the Chinese Academy of Sciences, University of Chinese Academy of Sciences, and the National Laboratory of Solid State Nanostructures at Nanjing University.