A magnetic cell includes a magnetic region formed from a precursor magnetic material. The precursor magnetic material included a diffusible species and at least one other species. An oxide region is disposed between the magnetic region and another magnetic region, and an amorphous region is proximate to the magnetic region. The amorphous region includes an attracter material that has a chemical affinity for the diffusible species that is higher than a chemical affinity of the at least one other species for the diffusible species. Thus, the diffusible species is transferred from the precursor magnetic material to the attracter material, forming a depleted magnetic material. The removal of the diffusible species and the amorphous nature of the region of the attracter material promotes crystallization of the depleted magnetic material, which enables high tunnel magnetoresistance and high magnetic anisotropy strength. Methods of fabrication and semiconductor devices are also disclosed.