Changing the spin of an electron

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Is it possible to change the spin of an electron (or any particle) by supplying some energy to it?
 
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The spin itself as in changing the 1/2 to 2/2? If so, no. It is not possible. However it is possible to change the direction of the spin, as in changing it from an up spin to a down spin.
 
By changing I mean +1/2 to -1/2
 
I believe so, as the + and - simply refer to the direction.
 
Isn't that what a magnetic field does? The initially randomly spinning electrons change their spins to align with the magnetic field.
 
in order to flip a spin you don't necessarily have to supply energy but angular momentum ...
 

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