Recently, I measured the magnetic 1/f noise in MTJs and calculated the phase loss based on the FDR. The phase loss is constant in both the AP and P magnetization configuration, indicating that the MTJ system is in an equilibrium state. Also, its value in the AP state is larger than that in the P state. However, the phase loss decreases during the transition from the AP to P state, which suggests the quasi-equilibrium state of the system.
Is there a quasi-equilibrium fluctuation-dissipation relation available to describe the observed phenomenon of the phase loss? or can I use other theory instead of the FDR?
I also found that the mechanism of nonequilibrium spin accumulation proposed by Prof J.M.D Coey's group could be a possible candidate. However, in our MTJ no obvious bias dependence of the magnetic 1/f noise was observed. The proposed mechanism therefore cannot be applied.
May I have any suggestion? Any comments will be appreciated. Thanks a lot.
Perhaps this is relevant.
http://arxiv.org/abs/1310.2541
Is the magnetic tunnel junction a thermal environment, or is it something quantum mechanical?
Thanks a lot for your reply. It's quite helpful. Yes, the magnetic tunnel junction is in a thermal environment and the thermal energy is usually considered as a stochastic field.
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