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Related Concept Videos

Magnetic Damping01:17

Magnetic Damping

Eddy currents can produce significant drag on motion, called magnetic damping. For instance, when a metallic pendulum bob swings between the poles of a strong magnet, significant drag acts on the bob as it enters and leaves the field, quickly damping the motion.
If, however, the bob is a slotted metal plate, the magnet produces a much smaller effect. When a slotted metal plate enters the field, an emf is induced by the change in flux; however, it is less effective because the slots limit the...
Primary Distribution01:28

Primary Distribution

Primary distribution systems deliver electrical power from substations to consumers through various voltage classes, with 15-kV class voltages being predominant among U.S. utilities. Older 2.5- and 5-kV classes are being replaced by 15-kV primaries, while higher 25- to 34.5-kV classes are used in high-density urban areas and rural regions with long feeders. Three-phase, four-wire multigrounded systems are widely employed for balanced power delivery, using the neutral wire as a grounding point.
Secondary Distribution01:25

Secondary Distribution

Secondary distribution systems provide electrical energy at the utilization voltage levels from distribution transformers to customer meters. Typical secondary voltages in the United States include 120/240 V for residential use, 208Y/120 V for residential and commercial use, and 480Y/277 V for industrial and high-rise commercial use.
In residential areas, 120/240 V single-phase, three-wire service is commonly used for lighting, outlets, and large appliances. Urban areas with high-density loads...
Transformers in Distribution System01:27

Transformers in Distribution System

Transformers in distribution systems can be broadly categorized into distribution substation transformers and other distribution transformers. They are crucial for stepping down high transmission voltages to levels suitable for distribution and end-user applications.
Distribution substation transformers come in various ratings and typically use mineral oil for insulation and cooling. To prevent moisture and air from entering the oil, some transformers use an inert gas like nitrogen to fill the...
Generator Voltage Control01:21

Generator Voltage Control

Generator voltage control is crucial for maintaining the stable operation of synchronous generators and wind turbines. In older models, a DC generator driven by the rotor delivers DC power to the rotor's field winding, and the power is transferred through slip rings and brushes. In the latest models, static or brushless exciters are used. Static exciters rectify AC power from the generator terminals and then transfer the DC power directly to the rotor. Brushless exciters, on the other hand, use...
Load-frequency control01:28

Load-frequency control

Load-frequency control (LFC) is vital for maintaining power system stability, ensuring that frequency and power flows remain within acceptable limits during load changes. Turbine-governor control eliminates rotor accelerations and decelerations following load changes. However, a steady-state frequency error persists when the change in the turbine-governor reference setting is zero. In an interconnected power system, each area agrees to export or import a scheduled amount of power through...

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Dispersion-tunable low-loss implanted spin-wave waveguides for large magnonic networks.

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Researchers developed low-loss magnonic waveguides using silicon ion implantation in yttrium iron garnet. This innovation enables longer spin-wave propagation and tunable dispersion, crucial for energy-efficient information processing.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Nanotechnology

Background:

  • Magnonic networks offer energy-efficient information processing potential.
  • Current spin-wave waveguides face limitations in propagation length and dispersion tuning.
  • Yttrium iron garnet (YIG) is a promising material for magnonic devices.

Purpose of the Study:

  • To realize low-loss spin-wave waveguides in yttrium iron garnet (YIG) thin films.
  • To overcome limitations of existing waveguide fabrication methods.
  • To demonstrate the potential for large-scale magnonic integrated circuits.

Main Methods:

  • Utilized silicon ion implantation to create amorphous waveguide cladding in YIG films.
  • Fabricated submicrometre waveguides using a maskless ion implantation technique.
  • Measured spin-wave propagation lengths and characterized waveguide dispersion.

Main Results:

  • Achieved spin-wave decay lengths exceeding 100 micrometers in submicrometre waveguides.
  • Demonstrated continuous and localized tuning of waveguide dispersion via ion implantation.
  • Successfully fabricated a large-scale magnonic network with 198 crossings.

Conclusions:

  • Silicon ion implantation is an effective method for creating high-performance magnonic waveguides.
  • The developed waveguides overcome key limitations, enabling efficient spin-wave propagation and tunability.
  • This work paves the way for wafer-scale integration of magnonic circuits for advanced computing.