HP nano device implements memristor



HP Labs has made a nano-scale device which stores data, explains previous anomalies in nano-device characteristics, and may be able to act as a synapse in analogue neural networks. It is also the first physical implementation of the memristor, claims HP, a theoretical partner to resistors, capacitors and inductors invented in 1971.

"Transistors are slightly faster at switching, but this is fast," HP Labs spokesman David Harrah told Electronics Weekly. "Stan [research head Stan Williams] is talking in terms of taking it down to 14nm and possibly single digits, so it has the potential to go to 1Tbit/cm2."
 HP 2.4GHz Wireless Optical Mobile Mouse - Midnight BlueHP 2.4GHz Wireless Optical Mobile Mouse - Ocean Drive
Possible in several ionic-electronic systems, the metal-insulator-metal device demonstrated has a stack of two titanium oxide layers its insulator. One is doped with oxygen, the other slightly starved of oxygen.


Electrons flow first through one layer and then the other. "The oxygen creates vacancies and these vacancies migrate to the other layer with current flow," said Harrah.
 Premium Hot Pink Magenta Soft Silicon Gel Skin Case Cover for the Apple iPod Nano 6 Gen, 6th GenerationHP 2.4 GHz Wireless Optical Mobile Mouse - Luminous Rose

That is: the oxygen ions move, causing the boundary between oxygen-rich and oxygen-starved TiO2 to move towards one electrode or the other changing the overall resistance of the insulator layer.

Depending on current direction, resistance increases with time or decreases with time, with the magnitude of resistance change dependent on charge (current x time). When current flow stops, resistance freezes. When current is reversed, resistance change reverses.

Plotted, current and voltage form a hysteresis loop which can be frozen at any point by stopping current flow and the device can therefore store data.

According to research head Williams, this behaviour is only noticeable in nano-scale dielectric layers as these offer the huge potential gradients required to shift ions at reasonable voltages.

Realising that ion drift in insulators can cause hysteresis may explain previously nano-scale electrical anomalies.


"The rich hysteretic I-V characteristics detected in many thin film two-terminal devices can now be understood," Williams told the journal Nature.

HP also sees the junction as possible component of artificial brains. "It is very similar to a brain synapse," said spokesman Harrah. "You could simulate a brain with transistors as neurons and a bunch of these as synapses."


37 years ago, scientist Leon Chua, now at the University of California at Berkeley, mused theoretically that with: resistors linking current and voltage, capacitors linking voltage and charge, and inductors linking current and flux there should be a component that linked charge and flux.

He named it a memristor - where memristance(M) links the two like this: d(flux)=Md(charge).

"In the trivial case of linear elements in which M is a constant, memristance is identical to resistance, and thus of no special interest," Williams told the journal Nature. "However, if M is itself a function of charge to yield a nonlinear circuit element, then things become quite interesting."

For limited excursions, Williams' device is exactly a memristor, said HP.

"This is an amazing development," Chua said. "It took someone like Stan Williams with a multi-disciplinary background and deep insights to conceive of such a tiny memristor only a few atoms in thickness."



An atomic force microscope image of 17 HP Labs non-linear devices in a row, each a pair of oxide layers between the single bottom wire and one of the top wires.

An atomic force microscope image of 17 HP Labs non-linear devices in a row, each a pair of oxide layers between the single bottom wire and one of the top wires.


Atomic force microscope images of 17 HP Labs non-linear devices in a row, each a pair of oxide layers between the single bottom wire and one of the top wires. "The devices act as 'memory resistors' [memristors], with the resistance of each device depending on the amount of charge that has moved through each one," Stanley Williams director of HP's quantum systems lab, told Electronics Weekly. The wires are 50nm - about 150 atoms - wide.

No comments:

Post a Comment

Labels

PROJECTS 8086 PIN CONFIGURATION 80X86 PROCESSORS TRANSDUCERS 8086 – ARCHITECTURE Hall-Effect Transducers INTEL 8085 OPTICAL MATERIALS BIPOLAR TRANSISTORS INTEL 8255 Optoelectronic Devices Thermistors thevenin's theorem MAXIMUM MODE CONFIGURATION OF 8086 SYSTEM ASSEMBLY LANGUAGE PROGRAMME OF 80X86 PROCESSORS POWER PLANT ENGINEERING PRIME MOVERS 8279 with 8085 MINIMUM MODE CONFIGURATION OF 8086 SYSTEM MISCELLANEOUS DEVICES MODERN ENGINEERING MATERIALS 8085 Processor- Q and A-1 BASIC CONCEPTS OF FLUID MECHANICS OSCILLATORS 8085 Processor- Q and A-2 Features of 8086 PUMPS AND TURBINES 8031/8051 MICROCONTROLLER Chemfet Transducers DIODES FIRST LAW OF THERMODYNAMICS METHOD OF STATEMENTS 8279 with 8086 HIGH VOLTAGE ENGINEERING OVERVOLATGES AND INSULATION COORDINATION Thermocouples 8251A to 8086 ARCHITECTURE OF 8031/8051 Angle-Beam Transducers DATA TRANSFER INSTRUCTIONS IN 8051/8031 INSTRUCTION SET FOR 8051/8031 INTEL 8279 KEYBOARD AND DISPLAY INTERFACES USING 8279 LOGICAL INSTRUCTIONS FOR 8051/8031 Photonic Transducers TECHNOLOGICAL TIPS THREE POINT STARTER 8257 with 8085 ARITHMETIC INSTRUCTIONS IN 8051/8031 LIGHTNING PHENOMENA Photoelectric Detectors Physical Strain Gage Transducers 8259 PROCESSOR APPLICATIONS OF HALL EFFECT BRANCHING INSTRUCTIONS FOR 8051/8031 CPU OF 8031/8051 Capacitive Transducers DECODER Electromagnetic Transducer Hall voltage INTEL 8051 MICROCONTROLLER INTEL 8251A Insulation Resistance Test PINS AND SIGNALS OF 8031/8051 Physical Transducers Resistive Transducer STARTERS Thermocouple Vacuum Gages USART-INTEL 8251A APPLICATIONs OF 8085 MICROPROCESSOR CAPACITANCE Data Transfer Instructions In 8086 Processors EARTH FAULT RELAY ELECTRIC MOTORS ELECTRICAL AND ELECTRONIC INSTRUMENTS ELECTRICAL BREAKDOWN IN GASES FIELD EFFECT TRANSISTOR (FET) INTEL 8257 IONIZATION AND DECAY PROCESSES Inductive Transducers Microprocessor and Microcontroller OVER CURRENT RELAY OVER CURRENT RELAY TESTING METHODS PhotoConductive Detectors PhotoVoltaic Detectors Registers Of 8051/8031 Microcontroller Testing Methods ADC INTERFACE AMPLIFIERS APPLICATIONS OF 8259 EARTH ELECTRODE RESISTANCE MEASUREMENT TESTING METHODS EARTH FAULT RELAY TESTING METHODS Electricity Ferrodynamic Wattmeter Fiber-Optic Transducers IC TESTER IC TESTER part-2 INTERRUPTS Intravascular imaging transducer LIGHTNING ARRESTERS MEASUREMENT SYSTEM Mechanical imaging transducers Mesh Current-2 Millman's Theorem NEGATIVE FEEDBACK Norton's Polarity Test Potentiometric transducers Ratio Test SERIAL DATA COMMUNICATION SFR OF 8051/8031 SOLIDS AND LIQUIDS Speed Control System 8085 Stepper Motor Control System Winding Resistance Test 20 MVA 6-digits 6-digits 7-segment LEDs 7-segment A-to-D A/D ADC ADVANTAGES OF CORONA ALTERNATOR BY POTIER & ASA METHOD ANALOG TO DIGITAL CONVERTER AUXILIARY TRANSFORMER AUXILIARY TRANSFORMER TESTING AUXILIARY TRANSFORMER TESTING METHODS Analog Devices A–D BERNOULLI’S PRINCIPLE BUS BAR BUS BAR TESTING Basic measuring circuits Bernoulli's Equation Bit Manipulation Instruction Buchholz relay test CORONA POWER LOSS CURRENT TRANSFORMER CURRENT TRANSFORMER TESTING Contact resistance test Current to voltage converter DAC INTERFACE DESCRIBE MULTIPLY-EXCITED Digital Storage Oscilloscope Display Driver Circuit E PROMER ELPLUS NT-111 EPROM AND STATIC RAM EXCITED MAGNETIC FIELD Electrical Machines II- Exp NO.1 Energy Meters FACTORS AFFECTING CORONA FLIP FLOPS Fluid Dynamics and Bernoulli's Equation Fluorescence Chemical Transducers Foil Strain Gages HALL EFFECT HIGH VOLTAGE ENGG HV test HYSTERESIS MOTOR Hall co-efficient Hall voltage and Hall Co-efficient High Voltage Insulator Coating Hot-wire anemometer How to Read a Capacitor? IC TESTER part-1 INSTRUMENT TRANSFORMERS Importance of Hall Effect Insulation resistance check Insulator Coating Knee point Test LEDs LEDs Display Driver LEDs Display Driver Circuit LM35 LOGIC CONTROLLER LPT LPT PORT LPT PORT EXPANDER LPT PORT LPT PORT EXTENDER Life Gone? MAGNETIC FIELD MAGNETIC FIELD SYSTEMS METHOD OF STATEMENT FOR TRANSFORMER STABILITY TEST METHODS OF REDUCING CORONA EFFECT MULTIPLY-EXCITED MULTIPLY-EXCITED MAGNETIC FIELD SYSTEMS Mesh Current Mesh Current-1 Moving Iron Instruments Multiplexing Network Theorems Node Voltage Method On-No Load And On Load Condition PLC PORT EXTENDER POTIER & ASA METHOD POWER TRANSFORMER POWER TRANSFORMER TESTING POWER TRANSFORMER TESTING METHODS PROGRAMMABLE LOGIC PROGRAMMABLE LOGIC CONTROLLER Parallel Port EXPANDER Paschen's law Piezoelectric Wave-Propagation Transducers Potential Transformer RADIO INTERFERENCE RECTIFIERS REGULATION OF ALTERNATOR REGULATION OF THREE PHASE ALTERNATOR Read a Capacitor SINGLY-EXCITED SOLIDS AND LIQUIDS Classical gas laws Secondary effects Semiconductor strain gages Speaker Driver Strain Gages Streamer theory Superposition Superposition theorem Swinburne’s Test TMOD TRANSFORMER TESTING METHODS Tape Recorder Three-Phase Wattmeter Transformer Tap Changer Transformer Testing Vector group test Virus Activity Voltage Insulator Coating Voltage To Frequency Converter Voltage to current converter What is analog-to-digital conversion Windows work for Nokia capacitor labels excitation current test magnetic balance voltage to frequency converter wiki electronic frequency converter testing voltage with a multimeter 50 hz voltages voltmeter

Search More Posts

Followers