The best replacement for magnetic is electronic ballast.

The best alternatives to magnetic are rated as following:
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★★★★★  true north
★★★  fluid trainer
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★★  electronic transformer
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★  true heading
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★  nonmagnetic
★  electromagnetic
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  infrared cat flap
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Your alternative for magnetic is not listed? Suggest!
Speaking about magnetic, one probably shouldn't forget about electronic ballast.

Other search terms related to magnetic and their ratings are:
★★★★★ electronic ballast
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Google Trends

Scale is based on the average worldwide traffic of magnetic in all years. Click on graph for more.
magnetic
electronic ballast
true north