摘要:
A multi-resistive state element that uses barrier electrodes is provided. If certain materials are used as electrodes, the electrodes can be used for multiple purposes. Oxides and nitrides are especially well suited for acting as a barrier layer, and possibly even an adhesion layer and a sacrificial layer.
摘要:
A memory cell including conductive oxide electrodes is disclosed. The memory cell includes a memory element operative to store data as a plurality of resistive states. The memory element includes a layer of a conductive metal oxide (CMO) (e.g., a perovskite) in contact with an electrode that may comprise one or more layers of material. At least one of those layers of material can be a conductive oxide (e.g., a perovskite such as LaSrCoO3-LSCoO or LaNiO3-LNO) that is in contact with the CMO. The conductive oxide layer can be selected as a seed layer operative to provide a good lattice match with and/or a lower crystallization temperature for the CMO. The conductive oxide layer may also be in contact with a metal layer (e.g., Pt). The memory cell additionally exhibits non-linear IV characteristics, which can be favorable in certain arrays, such as non-volatile two-terminal cross-point memory arrays.
摘要:
A 2-terminal trapped charge memory device is disclosed with voltage switchable multi-level resistance. The trapped charge memory device has a trapped charge memory body sandwiched between two electrodes. The trapped charge memory body can be made of a variety of semiconducting or insulating materials of single-crystalline, poly-crystalline or amorphous structure while containing current carrier traps whose respective energy levels and degrees of carrier occupancy, modifiable by the height and width of an applied write voltage pulse, determine the resistance. The mechanism of modification can be through carrier tunneling, free carrier capturing, trap-hopping conduction or Frenkel-Poole conduction. The current carrier traps can be created with dopant varieties or an initialization procedure.
摘要:
High density NVRAM. An array of memory cells capable of storing at least a megabit of information, each memory cell including a memory plug that includes a memory element that switches from a first resistance state to a second resistance state upon application of a first write voltage of a first polarity and reversibly switches from the second resistance state to the first resistance state upon application of a second write voltage of polarity opposite to the first polarity.
摘要:
A re-writable memory with multiple memory layers. Using both terminals of a memory cell in a stacked cross point structure for selection purposes allows multiple layers of conductive lines to be selected as long as there is only one memory cell that has two terminals selected. Sharing logic over multiple layers allows driver sets to be reused.
摘要:
A re-writable memory that uses resistive memory cell elements with non-linear IV characteristics is disclosed. Non-linearity is important in certain memory arrays to prevent unselected cells from being disturbed and to reduce the required current. Non-linearity refers to the ability of the element to block the majority of current up to a certain level, but then, once that level is reached, the element allows the majority of the current over and above that level to flow.
摘要:
Cross point memory array using multiple thin films. The invention is a cross point memory array that uses conductive array lines and multiple thin films as a memory plug. The thin films of the memory plug include a memory element and a non-ohmic device. The memory element switches between resistive states upon application of voltage pulses and the non-ohmic device imparts a relatively high resistance to the memory plug upon application of low magnitude voltages.
摘要:
A structure for a memory device including a plurality of substantially planar thin-film layers or a plurality of conformal thin-film layers is disclosed. The thin-film layers form a memory element that is electrically in series with first and second cladded conductors and operative to store data as a plurality of conductivity profiles. A select voltage applied across the first and second cladded conductors is operative to perform data operations on the memory device. The memory device may optionally include a non-ohmic device electrically in series with the memory element and the first and second cladded conductors. Fabrication of the memory device does not require the plurality of thin-film layers be etched in order to form the memory element. The memory element can include a CMO layer having a selectively crystallized polycrystalline portion and an amorphous portion. The cladded conductors can include a core material made from copper.
摘要:
A structure for a memory device including a plurality of substantially planar thin-film layers or a plurality of conformal thin-film layers is disclosed. The thin-film layers form a memory element that is electrically in series with first and second cladded conductors and operative to store data as a plurality of conductivity profiles. A select voltage applied across the first and second cladded conductors is operative to perform data operations on the memory device. The memory device may optionally include a non-ohmic device electrically in series with the memory element and the first and second cladded conductors. Fabrication of the memory device does not require the plurality of thin-film layers be etched in order to form the memory element. The memory element can include a CMO layer having a selectively crystallized polycrystalline portion and an amorphous portion. The cladded conductors can include a core material made from copper.
摘要:
A structure for a memory device including a plurality of substantially planar thin-film layers or a plurality of conformal thin-film layers is disclosed. The thin-film layers form a memory element that is electrically in series with first and second cladded conductors and operative to store data as a plurality of conductivity profiles. A select voltage applied across the first and second cladded conductors is operative to perform data operations on the memory device. The memory device may optionally include a non-ohmic device electrically in series with the memory element and the first and second cladded conductors. Fabrication of the memory device does not require the plurality of thin-film layers be etched in order to form the memory element. The memory element can include a CMO layer having a selectively crystallized polycrystalline portion and an amorphous portion. The cladded conductors can include a core material made from copper.