TY - JOUR
KW - Electrical resistivity
KW - Magnetic field
KW - Perovskite
KW - Iron
KW - Metal
KW - Room temperature
KW - Polarization
KW - Electric field
KW - Article
KW - Chemical structure
KW - Phase transition
KW - Tensile strength
KW - Temperature dependence
KW - Electric resistance
KW - Modulation
KW - Concentration (composition)
KW - Electromagnetic field
KW - Physical chemistry
AU - Y Lee
AU - Z.Q Liu
AU - J.T Heron
AU - J.D Clarkson
AU - J Hong
AU - C Ko
AU - M.D Biegalski
AU - U Aschauer
AU - S.L Hsu
AU - M.E Nowakowski
AU - J Wu
AU - H.M Christen
AU - S Salahuddin
AU - J.B Bokor
AU - N.A Spaldin
AU - D.G Schlom
AU - Ramamoorthy Ramesh
AB - In numerous systems, giant physical responses have been discovered when two phases coexist; for example, near a phase transition. An intermetallic FeRh system undergoes a first-order antiferromagnetic to ferromagnetic transition above room temperature and shows two-phase coexistence near the transition. Here we have investigated the effect of an electric field to FeRh/PMN-PT heterostructures and report 8% change in the electrical resistivity of FeRh films. Such a giant electroresistance (GER) response is striking in metallic systems, in which external electric fields are screened, and thus only weakly influence the carrier concentrations and mobilities. We show that our FeRh films comprise coexisting ferromagnetic and antiferromagnetic phases with different resistivities and the origin of the GER effect is the strain-mediated change in their relative proportions. The observed behaviour is reminiscent of colossal magnetoresistance in perovskite manganites and illustrates the role of mixed-phase coexistence in achieving large changes in physical properties with low-energy external perturbation. © 2015 Macmillan Publishers Limited. All rights reserved.
BT - Nature Communications
DO - 10.1038/ncomms6959
LA - eng
N1 - cited By 97
N2 - In numerous systems, giant physical responses have been discovered when two phases coexist; for example, near a phase transition. An intermetallic FeRh system undergoes a first-order antiferromagnetic to ferromagnetic transition above room temperature and shows two-phase coexistence near the transition. Here we have investigated the effect of an electric field to FeRh/PMN-PT heterostructures and report 8% change in the electrical resistivity of FeRh films. Such a giant electroresistance (GER) response is striking in metallic systems, in which external electric fields are screened, and thus only weakly influence the carrier concentrations and mobilities. We show that our FeRh films comprise coexisting ferromagnetic and antiferromagnetic phases with different resistivities and the origin of the GER effect is the strain-mediated change in their relative proportions. The observed behaviour is reminiscent of colossal magnetoresistance in perovskite manganites and illustrates the role of mixed-phase coexistence in achieving large changes in physical properties with low-energy external perturbation. © 2015 Macmillan Publishers Limited. All rights reserved.
PB - Nature Publishing Group
PY - 2015
T2 - Nature Communications
TI - Large resistivity modulation in mixed-phase metallic systems
VL - 6
SN - 20411723
ER -