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Related Concept Videos

Switching of BJT01:22

Switching of BJT

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Switching behavior in Bipolar Junction Transistors (BJTs) is a fundamental aspect utilized in various electronic circuits, particularly for digital logic applications like switches and amplifiers. In a typical switching circuit, a BJT alternates between cut-off and saturation modes, corresponding to the "off" and "on" states, respectively, thus behaving like an ideal switch.
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Some solids can transition directly into the gaseous state, bypassing the liquid state, via a process known as sublimation. At room temperature and standard pressure, a piece of dry ice (solid CO2) sublimes, appearing to gradually disappear without ever forming any liquid. Snow and ice sublimate at temperatures below the melting point of water, a slow process that may be accelerated by winds and the reduced atmospheric pressures at high altitudes. When solid iodine is warmed, the solid sublimes...
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Resistivity

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When a voltage is applied to a conductor, an electrical field is generated, and charges in the conductor feel the force due to the electrical field. The current density that results depends on the electrical field and the properties of the material. In some materials, including metals at a given temperature, the current density is approximately proportional to the electrical field. In these cases, the current density can be modeled as:
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Resistance01:19

Resistance

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When a current moves through any conductor, the conductor causes some level of difficulty for the current to flow. The measure of that difficulty is known as the resistance of the material and is represented by R. Every material has its own resistance. In the case of conductors, heat is emitted whenever a current passes through them. Resistance depends on the resistivity of the material. Resistivity is a characteristic of the material used to fabricate electrical components, whereas the...
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Equivalent Resistance

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In circuit analysis, situations often arise where resistors are neither in series nor parallel configurations. To tackle such scenarios, three-terminal equivalent networks like the wye (Y) (Figure 1 (a)) or tee (T) and delta (Δ) (Figure 1 (b)) or pi (π) networks come into play. These networks offer versatile solutions and are frequently encountered in various applications, including three-phase electrical systems, electrical filters, and matching networks.
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Resistance and Conductance01:25

Resistance and Conductance

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A conductor's DC resistance at a given temperature is influenced by its resistivity, length, and cross-sectional area. Resistivity is an inherent property of the conductor material, with annealed copper serving as the international standard for measurement. For instance, the resistivity of hard-drawn aluminum at 20 degrees Celsius is 61% of the standard conductivity of annealed copper.
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Unipolar Nonvolatile Resistive Switching in Pt/MgO/Ta/Ru Structures Deposited by Magnetron Sputtering.

L M Guerra, C Dias, J Pereira

    Journal of Nanoscience and Nanotechnology
    |April 10, 2018
    PubMed
    Summary

    This study demonstrates unipolar resistive switching in novel Pt/MgO/Ta/Ru memristors without electroforming. These nanodevices show stable switching for memory applications.

    Keywords:
    MemristorsMagnesium OxideMagnetron SputteringResistive Switching

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    Area of Science:

    • Materials Science
    • Nanotechnology
    • Solid-State Electronics

    Background:

    • Memristors, or memory resistors, are nanodevices exhibiting non-volatile resistive switching.
    • They are of significant interest for applications in non-volatile memories and neuromorphic computing.
    • Developing efficient and reliable memristive devices is crucial for next-generation electronics.

    Purpose of the Study:

    • To investigate unipolar resistive switching characteristics in novel Pt/MgO/Ta/Ru memristive structures.
    • To assess the feasibility of fabricating memristors without a demanding electroforming step.
    • To analyze the conduction mechanisms and switching parameters for potential memory applications.

    Main Methods:

    • Fabrication of Pt/MgO/Ta/Ru structures with a 15 nm oxide barrier.
    • Characterization of unipolar resistive switching behavior under electrical stress.
    • Analysis of ON and OFF states resistance, SET/RESET voltages, and endurance.
    • Investigation of the conduction mechanism in the ON state.

    Main Results:

    • Achieved unipolar resistive switching in Pt/MgO/Ta/Ru devices without requiring an electroforming process.
    • Identified an ohmic conduction mechanism for the ON state.
    • Observed an inverse relationship between ON state resistance and SET current compliance.
    • Demonstrated stable switching over 40 cycles with distinct ON (10¹ Ω) and OFF (10² Ω) states for over 10⁴ seconds.

    Conclusions:

    • The Pt/MgO/Ta/Ru structure is a promising candidate for memristive memory applications due to its efficient unipolar switching.
    • Eliminating the electroforming step simplifies fabrication and reduces power consumption.
    • The observed stability and distinct resistance states indicate potential for reliable non-volatile memory devices.