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The strongest man made magnets are those associated with the Large Hadron Collider. The strongest magnetic fields are produced by collaped stars.
Steel contains iron, which is ferromagnetic and can be magnetized. Aluminum, on the other hand, is not ferromagnetic but paramagnetic, so it is not attracted to magnets. This difference in magnetic properties explains why steel sticks to magnets but aluminum does not.
Neodymium magnets are the strongest type of permanent magnets commercially available. They have high magnetic strength and are commonly used in applications requiring strong magnetic fields.
Yes, paper clips are typically made of steel which is magnetic, so they can stick to magnets.
Your mechanical valve is made of surgical steel. Magnets are attracted to steel.