Diluted Magnetic Semiconductors
Diluted Magnetic Semiconductors - Related Videos
12:36
Semiconductors
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2023
Source: Derek Wilson, Asantha Cooray, PhD, Department of Physics & Astronomy, School of Physical Sciences, University of California, Irvine, CA Semiconductors are materials whose ability to conduct an electrical current depends strongly on their temperature and level of impurity. The most common type of semiconductor material is crystalline silicon. Most pure semiconductors are not outstanding conductors; to improve conductivity, a pure semiconductor is often combined or "doped" with an...
01:22
Semiconductors
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2024
There is variation in the electrical conductivity of materials - metals, semiconductors, and insulators that are showcased with the help of the energy band diagrams. Metals such as copper (Cu), zinc (Zn), or lead (Pb) have low resistivity and feature conduction bands that are either not fully occupied or overlap with the valence band, making a bandgap non-existent. This allows electrons in the highest energy levels of the valence band to easily transition to the conduction band upon gaining...
11:14
Comprehensive Characterization of Extended Defects in Semiconductor Materials by a Scanning Electron Microscope
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Cited by 4 •
2016
The optical, electrical, and structural properties of dislocations and of grain boundaries in semiconductor materials can be determined by experiments performed in a scanning electron microscope. Electron microscopy has been used to investigate cathodoluminescence, electron beam induced current, and diffraction of backscattered electrons.
02:59
Solution Concentration and Dilution
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2020
The relative amount of a given solution component is known as its concentration. Often, though not always, a solution contains one component with a concentration that is significantly greater than that of all other components. This component is called the solvent and may be viewed as the medium in which the other components are dispersed or dissolved. Solutions in which water is the solvent are, of course, very common on our planet. A solution in which water is the solvent is called an aqueous...
01:24
Dilution: Concept
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2026
Dilution in finance refers to the reduction in the ownership percentage of existing shareholders when a company issues additional shares. While dilution is often seen as a negative factor due to its impact on earnings per share (EPS) and voting power, it is sometimes necessary for a company's growth and sustainability.One primary reason for dilution is capital raising. Companies issue new shares to generate funds for expansion, research, acquisitions, or debt repayment. This allows businesses...
FAQs
Charge carriers interact with localized magnetic moments on the substituted ions through exchange coupling. This interaction links carrier motion to the magnetic state of the dopants, allowing electrical transport to depend on spin in addition to charge. That coupling provides the physical basis for controlling current through magnetic or spin-related device functionality.
Collective magnetic order does not arise automatically from adding magnetic ions. It depends on suitable composition and temperature conditions that allow the localized moments and carrier-mediated interactions to support an organized magnetic state. These dependencies make operating temperature and material composition important design variables when engineers seek stable magnetic behavior.
Dopant concentration sets how many localized magnetic moments are introduced, while carrier density influences the population available for exchange-coupled transport. Crystal quality affects how consistently those interactions occur through the host lattice. Engineering these variables together is essential because optimizing one factor alone may not produce the desired combination of conductivity and magnetic response.
Conventional charge-focused semiconductor operation treats electrical current primarily through carrier charge, whereas DMS-based operation can also use carrier spin. The additional spin degree of control enables electrical behavior to respond to magnetic states. This distinction makes DMSs relevant to spintronics, where information processing or sensing can incorporate magnetic as well as electronic variables.
A practical development strategy begins by selecting the host semiconductor and magnetic dopant, then controlling dopant concentration, carrier density, and crystal quality during material preparation. Engineers must also consider the temperature conditions required for the intended magnetic behavior. These controls determine whether the resulting material supports reliable spin-dependent transport for a target device.
DMSs can support spin-based transistors, nonvolatile memory, magnetic sensors, and optoelectronic devices. In each case, the material offers a way to connect electrical operation with magnetic state or carrier spin. The specific application determines which properties require the strongest control, such as transport response, magnetic stability, or compatibility with optoelectronic operation.
Evaluation should focus on whether the material provides controllable spin-dependent transport together with the required magnetic behavior under operating conditions. Engineers should relate these outcomes to dopant concentration, carrier density, crystal quality, and temperature. This assessment helps determine whether a DMS is suitable for a transistor, memory element, sensor, or optoelectronic component.