A free layer structure is provided for a spin valve sensor which has a nickel iron based layer and a ferromagnetic oxide layer wherein the cobalt iron oxide layer permits a thin nickel iron layer to be employed while maintaining a desired magnetic softness of the free layer structure and a desirable magnetoresistance of a spin valve sensor. The umbrella support apparatus is formed with an upright support member affixed to a pair of opposing horizontal support flanges that ride on top of the deck surface. The present invention relates further to a process for refining crude fats and oils, and refining plant for refining crude fats and oils.