Low-Temperature Glassy Response of Ultrathin Manganite Films to Electric and Magnetic Fields
arXiv:cond-mat/0407607 · doi:10.1103/PhysRevB.72.132406
Abstract
The glassy response of thin films of La0.8Ca0.2MnO3 to external magnetic and gated electrostatic fields in a field-effect geometry has been studied at low temperatures. A hierarchical response with irreversible memory effects, non-ergodic time evolution, aging and annealing behavior of the resistance suggest that the dynamics are governed by strain relaxation for both electronic and magnetic perturbations. Cross-coupling of charge, spin, and strain have been exploited to tune the coercivity of an ultrathin manganite film by electrostatic gating.
4 pages, 5 figures
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- Boundary Energies and the Geometry of Phase Separation in Double--Exchange Magnets
- Inhomogeneous Phases in a Double-Exchange Magnet with Long Range Coulomb Interactions