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(Color online) Schematic of SFL. Well-known half-metal material is not necessarily needed for SFL, because the required condition of SFL is not perfect asymmetry of DOS at Fermi level.
(Color online) MR ratio dependence on RA for CPP-GMR films with SFL materials A, B, C, D, and without SFL. Inset: typical R-H curve for CPP-GMR films with SFL material D.
(Color online) XRD profiles of model films of SFL materials A, B, C, and D.
(Color online) MR ratio dependence on RA for CPP-GMR films with SFL material D with different ferromagnetic layer thicknesses.
Summary of the comparison among materials A, B, C, and D. The d-spacing of spinel ferrite (222) or wüstite (111) planes for each material is estimated from Fig. 3. The d-spacing of magnetite (222) and wüstite (111) planes for bulk material is 0.242 nm and 0.25 nm, respectively.
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