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how to increase the magnetic strength of a materials?
We would need more information if we were to help you.
How to increase?...that is question.
Increase the current. The strength of magnetic field generated is proportional to the amount of current.
Take ferrow magnetic materials for your purpose.
Once a material is decided, you have chosen its magnetic (and other) properties.
To the best of my knowledge, Neodymium-Boron-Ferrite has the best properties at this time.