Those changes in magnetic orientation produce only about a 100 % change in resistance in the read head. (sciencemag.org)
Neuroanatomy of Magnetoreception: The Superior Colliculus Involved in Magnetic Orientation in a Mammal (science.sciencemag.org)
«It's an exciting property to have in a material because you could conceivably use the different magnetic orientations to encode data in a novel kind of magnetic memory,...» (anl.gov)