The best replacement for electromagnetic is mechanical waves.

The best alternatives to electromagnetic are rated as following:
★★★★★  mechanical waves
★★★  magnetic
★★★  electrostatic
★★  mechanical
★★  ultrasonic parking sensors
★  radio frequency
★  sound waves
★  sound wave
  mechanical wave
  piezoelectric
  permanent magnet

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Google Trends

Scale is based on the average worldwide traffic of electromagnetic in all years. Click on graph for more.
electromagnetic
mechanical waves
magnetic