Large room-temperature intergrain magnetoresistance in double perovskite SrFe1−x(Mo or Re)xO3
T. H. Kim(Rutgers, The State University of New Jersey), M. Uehara(Rutgers, The State University of New Jersey), S‐W. Cheong(Rutgers, The State University of New Jersey), Suheon Lee(Korea Advanced Institute of Science and Technology)
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Abstract
We report significant intergrain magnetoresistance (IMR) in polycrystalline double perovskites of SrFe1−x(Mo or Re)xO3 at room temperature. Systematics of the temperature dependence of IMR indicates that the observed large room-temperature IMR in SrFe1/2Mo1/2O3 originates from the ferrimagnetic nature of insulating grain boundaries as well as the half-metallicity of this perovskite. Our results indicate that a new avenue for spin-polarized tunneling junctions is to utilize insulating interface layers with ferromagnetic or ferrimagnetic coupling.
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