Abstract
The magnetic aging is observed in Bi0.84La0.16Fe0.88Ti0.12O3 polycrystalline ceramic at the morphotropic phase boundary. The magnetic properties, including the magnetization and coercivity, undergo a drastic change over time. The magnetic aging is explained according to the spin frustration at the phase boundary (PB) induced by the competition in Gibbs free energy and lattice strain of the coexisting phase. The change in the spin state at the PB creates the ferromagnetic order, which in turn supports the magnetic interaction at the interface of antiferromagnetic (AFM)/ferromagnetic (FM)/AFM sandwich structure. The magnetic interaction is revealed in terms of the vertical hysteresis shift, exchange bias effect, and field step-dependent hysteresis loop.
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