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Another ???:What is the solenoid current?
The Mosfet is not a logic-level one. Its threshold voltage rating is when it is barely conducting only 0.25mA. It is fully turned on when its gate is at +10V not at only +5V.Assuming that the Atmel Vdd is 5V, this will work:
Note that any NFET with a Gate Threshold of <3V, with a Drain current rating of >1A, a drain voltage of >20V, and an on-resistance < 0.1Ω will work.