Alternative for magnetic boots

In many sci-fi settings magnetic boots are used to help astronauts walk in microgravity. However, not all materials are ferromagnetic. Titanium, aluminum, the most form of carbon and silica can not be magnetized. And these would make up the surface of the most spaceships and asteroids. (except nickel-iron ones.)

What alternative technologies are possible, which could quickly grip and release various surfaces?

Futuristic technologies (like nano-arms gripping on microscopic surface irregularities) are allowed, but nothing, which explicitly violates known physical laws. (like paragravity)

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Alternative for magnetic boots

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