Observation of 300 K high energy magnetodielectric contrast in the bilayer manganite (La_(0.4) Pr_(0.6))_(1.2)Sr_(1.8)Mn_2O_7

摘要

Large high energy magnetodielectric effects are observed in the bilayer manganite (La_(0.4)Pr_(0.6))_(1.2)Sr_(1.8)Mn_2O_7, a direct consequence of exploiting magnetoresistance changes associated with the field driven spin-glass insulator to ferromagnetic metal transition and its high temperature remnant. The low temperature magnetodielectric contrast is as large as ～ 100% near 0.8 eV at 10 T and over 10 000% in selected phonon regions. The 300 K magnetodielectric contrast is ～20% near 1.1 eV at 30 T. The results are potentially useful for magnetic memory applications away from the dc limit.