Abstract
AbstractA high‐performance spin filter tunnel junction composed of an epitaxial oxide heterostructure is reported. By independently controlling the magnetic orientations of ferromagnetic tunnel barrier and electrode layers, a tunnel magnetoresistance ratio exceeding 120% is obtained purely by the spin filtering effect. A newly introduced spin filter material, Pr0.8Ca0.2Mn1‐yCoyO3, is shown to be useful for building novel multibarrier spintronic tunnel devices due to its composition‐controlled magnetic hardness.
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