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Experimental studies of FeCoB/MgO/FeCoB tunnel junctions indicate that borondiffuses into MgO during rf-sputtering and forms polycrystalline Mg-B-Oregions. These tunnel junctions provide high tunneling magnetoresistance valuesand low RA products. However the crystal structure of the Mg-B-O region remainsunknown. Using density functional techniques, I examine three potential Mg(B)oxides including Mg$_{2}$B$_{2}$O$_{5}$ (monoclinic and triclinic) and theorthorhombic mineral Kotoite (Mg$_3$B$_2$O$_6$). Kotoite is the best candidatefor formation in magnetic tunnel junctions. The (100) surface of Kotoite has agood lattice match with (001) MgO and could template neighboring FeCo into bcclayers during annealing. Complex band structure analysis of Kotoite shows thatthe C$_{2v}$ $\tilde{\Delta}_1$ band has a much smaller imaginary k componentthan the C$_{2v}$ $\tilde{\Delta}_4$ band. Based on symmetry analysis, themajority spin $\Delta_1$ band in FeCo should couple well with the Kotoite$\tilde{\Delta}_1$ band, while the minority FeCo $\Delta_5$ will couplepartially with the $\tilde{\Delta}_4$ band. Kotoite provides a new route tohigh tunneling magnetoresistance based on spin filtering by a lower symmetryoxide region.

Oxide layer boron leads to reduced symmetry spin filtering magnetic tunnel junctions