The phrase "electromagnetic devices" is correct and usable in written English.
You can use it to refer to any devices that use electromagnetic forces for their operation. For example: "Computers, phones, and televisions are all examples of electromagnetic devices."
In 1825 in Britain William Sturgeon discovered the multiturn electromagnet, and in 1831 Michael Faraday of Britain and Joseph Henry of the United States refined the science of electromagnetism sufficiently to make it possible to design practical electromagnetic devices.
The dummy warheads would have heat and electromagnetic devices designed to trick missile defense systems, he said.
A year and a half ago, WikiLeaks published the results of an Army test, conducted in 2004, of electromagnetic devices designed to prevent IEDs from being triggered.
But recently, electrical or electromagnetic devices that hark back to the head-zapping torpedo fish have come into vogue among the country's most prominent migraine researchers.
At speeds such as this, inspection and safety precautions are more reliably carried out by electromagnetic devices based primarily on the use of photoelectric cells; for example, a series of cells on the track, over which a roll of paper moves, react to tearing by stopping the machine.
Transformers are electromagnetic devices, and their core has saturated characteristic.
She also began treatments with a Rife machine, an electromagnetic device invented in the nineteen-twenties which emits radio signals that, some researchers suggest, can destroy harmful bacteria.
In between, strings rattled with clattering preparations à la Cage, and hummed under the influence of an EBow (an electromagnetic device used to create sustained sounds).
Relay, in electricity, electromagnetic device for remote or automatic control of current in one (relay) circuit, using the variation in current in another (energizing) circuit.
When a signal aspect is restrictive, an electromagnetic device is activated between the rails, which in turn causes an audible warning to sound in the cab of any train passing over it.
Paul received his share of the prize for his development of the Paul trap an electromagnetic device that captures ions (electrically charged atoms) and holds them long enough for their properties to be accurately measured.
