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Stochastic resonance in bistable spin-crossover compounds with light-induced transitions
Iurii Gudyma1, Artur Maksymov1, Mihai Dimian2
1Department of General Physics, Chernivtsi National University, 58012 Chernivtsi, Ukraine.
This study theoretically predicts stochastic resonance in spin-crossover materials. The signal-to-noise ratio shows a unique two-peak behavior due to the system's asymmetric potential.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Theoretical Physics
Background:
- Spin-crossover (SCO) materials exhibit bistability, making them promising for memory devices.
- Stochastic resonance (SR) is a phenomenon where noise enhances signal detection in nonlinear systems.
- Understanding SR in SCO materials could lead to novel signal processing applications.
Purpose of the Study:
- To theoretically predict and analyze stochastic resonance in spin-crossover materials.
- To investigate the influence of noise characteristics on SR in SCO systems.
- To explore the relationship between system dynamics and resonance behavior.
Main Methods:
- Phenomenological kinetic model for SCO systems.
- Dynamical potential analysis using Lyapunov functions.
- Numerical simulation of stochastic trajectories (white and colored noise).
- Signal-to-noise ratio (SNR) evaluation.
Main Results:
- Theoretical prediction of stochastic resonance in SCO materials.
- Observed a distinctive two-peak behavior in the SNR.
- The two-peak SNR is attributed to the asymmetric dynamic potential of the SCO system.
- Studied the effect of autocorrelation time in the Ornstein-Uhlenbeck process on resonance conditions.
Conclusions:
- Stochastic resonance is theoretically achievable in spin-crossover materials.
- The asymmetric potential plays a crucial role in shaping the resonance characteristics.
- Noise properties significantly influence the signal detection capabilities of SCO systems.
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