Lever pulsates while braking I installed a new front float rotor, the ones that you can get from AliExpress. I have Deore XT brakes.

While using the front brake the lever moves back and forth while pulling it. I inspected whether the rotor was bent or the caliper was not properly aligned but everything is okay.

I can't figure out what the problem is or is it expected to work like that for float rotors.  Need help. Please
Assuming that you've already checked that the rotor is true (and out-of-true rotors are more responsible for rub than pulsation), I would take a micrometer and measure the thickness of the rotor in multiple places. You are likely to find that it was not machined correctly. Also, check the surface finish of the rotor on both sides. It doesn't matter what it is so much as that it is uniform, all the way around.