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Related Concept Videos

Biasing of Metal-Semiconductor Junctions01:27

Biasing of Metal-Semiconductor Junctions

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Biasing metal-semiconductor junctions involves applying a voltage across the junction. Specifically, the metal is connected to a voltage source, while the semiconductor is grounded. This technique is essential for controlling the direction and magnitude of current flow in electronic devices, including diodes, transistors, and photovoltaic cells.
In Schottky junctions, where the semiconductor is n-type, applying a positive voltage to the metal relative to the semiconductor reduces its Fermi...
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MOSFET: Enhancement Mode01:22

MOSFET: Enhancement Mode

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Enhancement-mode MOSFETs are pivotal components in electronics, distinguished by their capacity to act as highly efficient switches. They are part of the larger family of metal-oxide Semiconductor Field-Effect Transistors (MOSFETs). They are available in two types: p-channel and n-channel, each tailored to specific polarity operations.
In their basic form, enhancement-mode MOSFETs are typically non-conductive when the gate-source voltage (Vgs) is zero. This default 'off' state means no...
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Biasing of FET01:22

Biasing of FET

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Biasing a Junction Field Effect Transistor (JFET) is crucial for setting operational parameters and ensuring efficient functioning in electronic circuits. JFETs are characterized by using a single carrier type in N-channel or P-channel configurations, where the channel is surrounded by PN junctions. These junctions are central to the device's ability to control current flow.
In an N-channel JFET, the structure consists of N-type material forming the channel on a P-type substrate, with the...
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Biasing of P-N Junction01:16

Biasing of P-N Junction

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The operation of a p-n junction diode involves various biasing conditions, including forward bias, reverse bias, and equilibrium.
In equilibrium, no external voltage is applied across the p-n junction. The depletion region is formed at the junction interface due to the diffusion of carriers, which leaves behind charged dopants, acceptors on the p-side, and donors on the n-side. These immobile charges create an electric field that prevents further diffusion of carriers. The related energy band...
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Ion Exchange01:17

Ion Exchange

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Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or...
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Metal-Semiconductor Junctions01:24

Metal-Semiconductor Junctions

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The contact of metal and semiconductor can lead to the formation of a junction with either Schottky or Ohmic behavior.
Schottky Barriers
Schottky barriers arise when a metal with a work function (Φm) contacts a semiconductor with a different work function (Φs). Initially, electrons transfer until the Fermi levels of the metal and semiconductor align at equilibrium. For instance, if Φm > Φs, the semiconductor Fermi level is higher than the metal's before contact. The...
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Updated: Oct 25, 2025

In Situ Transmission Electron Microscopy with Biasing and Fabrication of Asymmetric Crossbars Based on Mixed-Phased a-VOx
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Electrically Enhanced Exchange Bias via Solid-State Magneto-ionics.

Peyton D Murray1, Christopher J Jensen2, Alberto Quintana2

  • 1Physics Department, University of California, Davis, California 95616, United States.

ACS Applied Materials & Interfaces
|August 4, 2021
PubMed
Summary
This summary is machine-generated.

Voltage control of magnetism is achieved through electrically induced ionic motion in Gd/NiCoO thin films. This magneto-ionic approach tunes exchange bias, paving the way for advanced logic, sensor, and data storage technologies.

Keywords:
electric field control of magnetismelectron energy loss spectroscopyexchange biasmagneto-ionicspolarized neutron reflectometry

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Electrically induced ionic motion enables voltage-controlled magnetism.
  • This is crucial for developing next-generation electronic devices.
  • Exchange bias is a key phenomenon in spintronics.

Purpose of the Study:

  • To demonstrate electrical tuning of exchange bias in Gd/NiCoO thin films.
  • To explore the underlying magneto-ionic mechanisms.
  • To assess the potential for energy-efficient magneto-ionic devices.

Main Methods:

  • Fabrication of Gd/NiCoO thin films.
  • Field cooling (FC) for exchange bias establishment.
  • Voltage conditioning for enhancement and reset.
  • Electron microscopy and polarized neutron reflectometry for characterization.

Main Results:

  • A solid-state redox reaction formed an interfacial ferromagnetic NiCo layer.
  • Exchange bias was established after FC.
  • Voltage conditioning enhanced exchange bias by up to 35%.
  • The effect was reversible with a second FC.

Conclusions:

  • The study validates a solid-state magneto-ionic approach for electric control of exchange bias.
  • Interfacial alloying and redox reactions are key mechanisms.
  • This method shows promise for energy-efficient magneto-ionic devices.