I just wanted to clarify that "spin" only has two states, commonly known as up or down. There is no condition or mode where the there is "no spin", which is what you imply in your list of states for spintronics.

Elliot Alderson‭iot if the charge state is 0, then we dont hav to worry about the spin state.Spintronics provide us with 3 available states unlike electronics which provides us with only 2 states.

I don't see anything in the Wikipedia article you linked that talks about there being 3 states for spintronics. Can you clarify, or provide another reference? When you talk about charge or no charge, what is the physical thing that either has charge or does not have charge? Just as we know that it is the electron that has spin, what is it that might have no charge and is used as a "state"?

Suppose we have a transistor connected in series with a magnetic tunnel junction.1st case:the output voltage is low(the transistor is off) (0V)this represents the case of no charge state.2nd case:the transistor is on and the 2 layers of ferromagnetic materials which create the magnetic junction, have the same magnetisation so the overall resistance of the circuit is very low which gives a logic of 1.3rd case:the transistor is on and the 2 layers of magnetic materials which create the magnetic junction,have opposite magnetisation so the overall resistance of the circuit is high but not high enough to drive the output to 0V lets say some voltage in the middle(if we have 5V source powering the circuit output is 2.5V).This represents the logic state 2