I still do not understand what you want to know exactly. Spin polarization often refers to alignment of spin moment in a particular direction. If you are concerned with pure ferromagnetic material, the task is very simple, simply sweep the field, the magnetization will grew and result will be a hysteresis loop. When the external field magnetizes the ferromagnetic material, so called spin wave lead to current, which often refers to spin current.
But if your question is for spintronics means, this is achieved by choosing different coercive ferromagnetic materials as electrode with help of tunnel barrier. By changing the spin alignment of one with respect to other we can achieve spin polarization effect.
Please refer to similar analogy of Andrew reflection, Meservey-Tedrow experiments, etc.
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